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  Subjects -> GEOGRAPHY (Total: 493 journals)
Showing 1 - 200 of 277 Journals sorted by number of followers
Geophysical Research Letters     Full-text available via subscription   (Followers: 183)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 161)
Journal of Geophysical Research : Atmospheres     Partially Free   (Followers: 149)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 142)
Remote Sensing of Environment     Hybrid Journal   (Followers: 96)
Antipode     Hybrid Journal   (Followers: 65)
Journal of Geophysical Research : Earth Surface     Partially Free   (Followers: 60)
Journal of Geophysical Research : Oceans     Partially Free   (Followers: 60)
Progress in Human Geography     Hybrid Journal   (Followers: 60)
Journal of Geophysical Research : Solid Earth     Full-text available via subscription   (Followers: 58)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 56)
GIScience & Remote Sensing     Open Access   (Followers: 54)
Journal of Water and Climate Change     Open Access   (Followers: 53)
Climate Change Economics     Hybrid Journal   (Followers: 50)
Reviews of Geophysics     Full-text available via subscription   (Followers: 49)
Remote Sensing Letters     Hybrid Journal   (Followers: 45)
Annals of the American Association of Geographers     Hybrid Journal   (Followers: 43)
Economic Geography     Hybrid Journal   (Followers: 42)
Applied Geography     Hybrid Journal   (Followers: 39)
Climate and Development     Hybrid Journal   (Followers: 34)
Urban Geography     Hybrid Journal   (Followers: 34)
Journal of Geophysical Research : Biogeosciences     Full-text available via subscription   (Followers: 34)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 34)
Annals of GIS     Open Access   (Followers: 32)
Journal of Coastal Research     Hybrid Journal   (Followers: 31)
Cartography and Geographic Information Science     Hybrid Journal   (Followers: 31)
GPS Solutions     Hybrid Journal   (Followers: 28)
Transactions of the Institute of British Geographers     Hybrid Journal   (Followers: 27)
Journal of Urbanism: International Research on Placemaking and Urban Sustainability     Hybrid Journal   (Followers: 24)
Journal of the Middle East and Africa     Hybrid Journal   (Followers: 23)
Dialogues in Human Geography     Hybrid Journal   (Followers: 20)
China : An International Journal     Full-text available via subscription   (Followers: 20)
Urban Research & Practice     Hybrid Journal   (Followers: 20)
Imago Mundi: The International Journal for the History of Cartography     Hybrid Journal   (Followers: 20)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Atmospheric Measurement Techniques (AMT)     Open Access   (Followers: 19)
Water International     Hybrid Journal   (Followers: 19)
Journal of the American Planning Association     Hybrid Journal   (Followers: 19)
Geography Compass     Hybrid Journal   (Followers: 18)
Journal of Cultural Geography     Hybrid Journal   (Followers: 18)
Cartographica : The International Journal for Geographic Information and Geovisualization     Full-text available via subscription   (Followers: 17)
Professional Geographer     Hybrid Journal   (Followers: 17)
Africa Insight     Full-text available via subscription   (Followers: 16)
Crossings : Journal of Migration & Culture     Hybrid Journal   (Followers: 16)
The Geographical Journal     Hybrid Journal   (Followers: 16)
International Geology Review     Hybrid Journal   (Followers: 16)
Computational Geosciences     Hybrid Journal   (Followers: 15)
Tectonics     Full-text available via subscription   (Followers: 15)
Geomatics, Natural Hazards and Risk     Open Access   (Followers: 14)
American Journal of Geographic Information System     Open Access   (Followers: 14)
Annual Review of Marine Science     Full-text available via subscription   (Followers: 13)
Buildings & Landscapes: Journal of the Vernacular Architecture Forum     Full-text available via subscription   (Followers: 13)
Progress in Physical Geography     Hybrid Journal   (Followers: 13)
International Indigenous Policy Journal     Open Access   (Followers: 13)
Geographical Review     Hybrid Journal   (Followers: 13)
Bulletin of Geosciences     Open Access   (Followers: 12)
Geographical Analysis     Hybrid Journal   (Followers: 11)
Journal of Geography     Hybrid Journal   (Followers: 11)
Geosciences Journal     Hybrid Journal   (Followers: 11)
Geographical Research     Hybrid Journal   (Followers: 11)
Canadian Journal of Soil Science     Full-text available via subscription   (Followers: 11)
GeoJournal     Hybrid Journal   (Followers: 11)
American Journal of Human Ecology     Open Access   (Followers: 11)
Geography and Natural Resources     Hybrid Journal   (Followers: 10)
European Spatial Research and Policy     Open Access   (Followers: 9)
Cartographic Journal     Hybrid Journal   (Followers: 9)
Atmospheric Measurement Techniques Discussions (AMTD)     Open Access   (Followers: 9)
Journal of Iberian and Latin American Research     Hybrid Journal   (Followers: 8)
Physical Geography     Hybrid Journal   (Followers: 8)
International Journal of Health Geographics     Open Access   (Followers: 8)
Natural Science     Open Access   (Followers: 8)
Middle East Development Journal     Hybrid Journal   (Followers: 8)
Journal of Borderlands Studies     Hybrid Journal   (Followers: 8)
Journal of Geographical Systems     Hybrid Journal   (Followers: 8)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 8)
Urban History Review / Revue d'histoire urbaine     Full-text available via subscription   (Followers: 7)
Journal of Latin American Geography     Full-text available via subscription   (Followers: 7)
California Italian Studies Journal     Full-text available via subscription   (Followers: 7)
Geo-spatial Information Science     Open Access   (Followers: 7)
Nordic Journal of Migration Research     Open Access   (Followers: 7)
Journal of Maps     Open Access   (Followers: 7)
Social Geography Discussions (SGD)     Open Access   (Followers: 7)
GeoInformatica     Hybrid Journal   (Followers: 7)
Northern Scotland     Hybrid Journal   (Followers: 6)
Asia Policy     Full-text available via subscription   (Followers: 6)
Australian Geographer     Hybrid Journal   (Followers: 6)
Singapore Journal of Tropical Geography     Hybrid Journal   (Followers: 6)
Ocean Science Journal     Hybrid Journal   (Followers: 6)
The Canadian Geographer/le Geographe Canadien     Hybrid Journal   (Followers: 6)
Creativity Studies     Open Access   (Followers: 5)
Australian Antarctic Magazine     Free   (Followers: 5)
Focus on Geography     Partially Free   (Followers: 5)
Journal of Developmental Entrepreneurship     Hybrid Journal   (Followers: 5)
Asian Geographer     Hybrid Journal   (Followers: 5)
Current Research in Geoscience     Open Access   (Followers: 5)
Journal of Australian Studies     Hybrid Journal   (Followers: 5)
ISPRS International Journal of Geo-Information     Open Access   (Followers: 5)
Journal of Map & Geography Libraries     Hybrid Journal   (Followers: 5)
Transmodernity : Journal of Peripheral Cultural Production of the Luso-Hispanic World     Open Access   (Followers: 4)
Applied Geomatics     Hybrid Journal   (Followers: 4)
Latinoamérica. Revista de estudios Latinoamericanos     Open Access   (Followers: 4)
Bulletin of the Ecological Society of America     Open Access   (Followers: 4)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 4)
Globe, The     Full-text available via subscription   (Followers: 4)
Genre & histoire     Open Access   (Followers: 4)
Journal of Sedimentary Research     Hybrid Journal   (Followers: 4)
Southeastern Europe     Hybrid Journal   (Followers: 3)
Bulletin of Geography. Socio-economic Series     Open Access   (Followers: 3)
Limnological Review     Open Access   (Followers: 3)
Interaction     Full-text available via subscription   (Followers: 3)
Journal of Western Archives     Open Access   (Followers: 3)
Économie rurale     Open Access   (Followers: 3)
Social Dynamics: A journal of African studies     Hybrid Journal   (Followers: 3)
New Zealand Journal of Geography     Hybrid Journal   (Followers: 3)
Journal of Burma Studies     Full-text available via subscription   (Followers: 3)
South Asian Diaspora     Hybrid Journal   (Followers: 3)
All Earth     Open Access   (Followers: 3)
Lithosphere     Open Access   (Followers: 3)
International Journal of Image and Data Fusion     Hybrid Journal   (Followers: 3)
Polar Research     Open Access   (Followers: 3)
History of Geo- and Space Sciences     Open Access   (Followers: 2)
Journal of Earthquake and Tsunami     Hybrid Journal   (Followers: 2)
Pastoralism : Research, Policy and Practice     Open Access   (Followers: 2)
Standort - Zeitschrift für angewandte Geographie     Hybrid Journal   (Followers: 2)
Norois     Open Access   (Followers: 2)
Geodesy and Cartography     Open Access   (Followers: 2)
Eastern European Countryside     Open Access   (Followers: 2)
Mineralogia     Open Access   (Followers: 2)
Regions and Cohesion     Open Access   (Followers: 2)
Polar Geography     Hybrid Journal   (Followers: 2)
Southeastern Geographer     Full-text available via subscription   (Followers: 2)
BioRisk     Open Access   (Followers: 2)
Norsk Geografisk Tidsskrift - Norwegian Journal of Geography     Hybrid Journal   (Followers: 2)
Scottish Geographical Journal     Hybrid Journal   (Followers: 2)
Geosphere     Open Access   (Followers: 2)
Études rurales     Open Access   (Followers: 2)
Yearbook of the Association of Pacific Coast Geographers     Full-text available via subscription   (Followers: 2)
Polar Journal     Hybrid Journal   (Followers: 2)
Newfoundland and Labrador Studies     Full-text available via subscription   (Followers: 2)
Regional Science Policy & Practice     Hybrid Journal   (Followers: 2)
Provincial China     Hybrid Journal   (Followers: 2)
Geographical Education     Full-text available via subscription   (Followers: 2)
Cahiers franco-canadiens de l'Ouest     Full-text available via subscription   (Followers: 2)
The South Asianist     Open Access   (Followers: 2)
Reflets : revue d'intervention sociale et communautaire     Full-text available via subscription   (Followers: 2)
Maine Policy Review     Open Access   (Followers: 2)
Revista de Geografía Norte Grande     Open Access   (Followers: 1)
Geoforum Perspektiv     Open Access   (Followers: 1)
Estudios Geográficos     Open Access   (Followers: 1)
PRISM : A Journal of Regional Engagement     Open Access   (Followers: 1)
Norteamérica     Open Access   (Followers: 1)
Amerika     Open Access   (Followers: 1)
L'Année du Maghreb     Open Access   (Followers: 1)
Indiana     Open Access   (Followers: 1)
Les Cahiers d'Outre-Mer     Open Access   (Followers: 1)
Journal of the Southwest     Full-text available via subscription   (Followers: 1)
Revue archéologique du Centre de la France     Open Access   (Followers: 1)
Journal of Terrestrial Observation     Open Access   (Followers: 1)
Méditerranée     Open Access   (Followers: 1)
Journal de la Société des Océanistes     Open Access   (Followers: 1)
Geochronometria     Open Access   (Followers: 1)
South African Geographical Journal     Hybrid Journal   (Followers: 1)
GEM - International Journal on Geomathematics     Hybrid Journal   (Followers: 1)
Terrae Incognitae     Hybrid Journal   (Followers: 1)
International Journal of Bahamian Studies     Open Access   (Followers: 1)
Études internationales     Full-text available via subscription   (Followers: 1)
Recherches sociographiques     Full-text available via subscription   (Followers: 1)
Physio-Géo     Open Access   (Followers: 1)
GEOMATICA     Hybrid Journal   (Followers: 1)
European Countryside     Open Access   (Followers: 1)
PSC Discussion Papers Series     Open Access  
Anales de Geografía de la Universidad Complutense     Open Access  
International Journal of River Basin Management     Hybrid Journal  
Revista Geográfica de América Central     Open Access  
Multiciencias     Open Access  
Investigaciones Geográficas (Esp)     Open Access  
Sociedade & Natureza     Open Access  
Región y Sociedad     Open Access  
Migración y Desarrollo     Open Access  
Migraciones Internacionales     Open Access  
Investigaciones Geográficas     Open Access  
Frontera Norte     Open Access  
Cuadernos de Desarrollo Rural     Open Access  
Boletim de Ciências Geodésicas     Open Access  
Territoire en Mouvement     Open Access  
Quaestiones Geographicae     Open Access  
Limes. Cultural Regionalistics     Open Access  
Preview     Hybrid Journal  
Cuadernos de Geografía : Revista Colombiana de Geografía     Open Access  
Studia Universitatis Babes-Bolyai, Geologia     Open Access  
Recherches amérindiennes au Québec     Full-text available via subscription  
Rabaska : revue d'ethnologie de l'Amérique française     Full-text available via subscription  
Port Acadie : revue interdisciplinaire en études acadiennes / Port Acadie: An Interdisciplinary Review in Acadian Studies     Full-text available via subscription  
Études/Inuit/Studies     Full-text available via subscription  
Aurora Journal     Full-text available via subscription  
Revista de la Asociacion Geologica Argentina     Open Access  
San Francisco Estuary and Watershed Science     Open Access  
Journal of Alpine Research : Revue de géographie alpine     Open Access  
Géocarrefour     Open Access  
Confins     Open Access  

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Mediterranean Geoscience Reviews
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2661-863X - ISSN (Online) 2661-8648
Published by Springer (Kluwer Academic Publishers); Brill Academic Publishers  [1 journal]
  • The 21 and 22 August 1856 earthquake (I0 IX-X EMS, Ms 6.6): damage and
           repair from an unpublished historical source and impact on Jijel city
           nowadays

    • Free pre-print version: Loading...

      Abstract: Abstract The recent seismic activity (2018–2021) in the Jijel region provides us with an opportunity to return to the most destructive and tsunamigenic earthquakes that hit Jijel town (formerly Djidjelli) on 21 and 22 August 1856. The purpose of this study is to deliver to scientists and different users detailed information on the damage caused by the seismic events to the buildings of Jijel city. This information is contained in an unpublished report that we found in the historical archives of the French colonial Army. The first exploitation of these data, supported by different illustrations, allows us to get indices for evaluating a priori possible damage that could be caused by a forthcoming earthquake of the same size (I0 IX, Ms ≥ 6.6) to Jijel city and its close surroundings.
      PubDate: 2022-09-13
       
  • Joint inversion of receiver functions and surface wave dispersion
           velocities to investigate the crustal structure of north of Morocco: case
           of Rif domain

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      Abstract: Abstract Based on three-component seismograms of teleseismic events, the receiver function (RF) and surface wave dispersion approaches are well-confirmed tools for exploring crustal and upper mantle structures of northern Morocco. In addition, providing new data to better constrain and understand the geodynamic evolution and the Earth’s interior structure under the Rif Mountain is crucial. This study aimed to investigate the crustal complexities and the mohogeometry beneath the study area and to detect the possible high velocity. In addition, the depth of basement rocks and the thickness of the sedimentary cover under the surface of the study area are retrieved. A database of teleseismic events digitally recorded by 35 broad-band seismic stations from the TopoIberia, Picasso and CNRST located in Northern Morocco is used. Results show that the crustal structure of northern Morocco is filled by a sequence of sediments that differs in thickness across the region. The crustal thickness differs from West to East and reaches a maximum value of about 45 km in the Central Rif and a minimum of about 18 km in the Eastern Rif. The obtained Vp/Vs ratio varies between 1.7 and 1.8 in northern Morocco. The areas with a somewhat noticeable increase in the Vp/Vs ratio may represent geothermal areas, which could be exploited as renewable energy sources in the north of Morocco. The shear wave velocity model delineates a low seismic velocity zone in the upper crust at Central Rif and is observed at depths ranging from 5 to 12 km. This low-velocity zone may be attributed to the presence of weak fault zones. Compared with previous studies, the current study covers most of northern Morocco and provides new information about the tectonic evolution and crustal structure for those regions. The crustal models inferred from the RFs are consistent with previous studies, especially at stations located in the same areas.
      PubDate: 2022-09-10
       
  • Reassessing the rupture process of the 2003 Boumerdes-Zemmouri earthquake
           (Mw 6.8, northern Algeria) using teleseismic, strong motion, InSAR, GPS,
           and coastal uplift data

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      Abstract: Abstract In this work, we determined the coseismic slip distribution of the Boumerdes-Zemmouri earthquake (Mw 6.8, 2003) by inverting a most comprehensive set of data, teleseismic seismograms, strong motion seismograms, coastaluplift, Global Positioning System (GPS), and Interferometric Synthetic Aperture Radar. We suggest a best-fitting model of coseismic slip distribution on the following two segments: the first segment oriented at N70° and the second segment located at the west of the first one and oriented at N100°.The slip distribution shows two slip patches on the N70° segment containing the hypocenter. The eastern patch is shallower, located between 0 and 9 km depth, with a maximum slip of 2.30 m. The western slip-patch on this same segment is deeper, between 4 and 12 km depth, with a slip that reaches a maximum value of 2.70 m at the center. The N100° segment also displays two slip patches, a small one in the east of the segment, which is between 4 and 8 km depth and a larger one in the western part of the segment, between 0 and 10 km depth. Both patches associated with the N100° segment show a maximum slip between 1.10 and 1.40 m.
      PubDate: 2022-09-06
       
  • Empirical calibration of earthquake magnitudes for the Tell Atlas
           (Northern Algeria)

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      Abstract: Abstract The Tell Atlas of Algeria is an earthquake-prone area, which experienced many strong earthquakes induced by the collision between the African and Eurasian plates. The “Centre de Recherche en Astronomie Astrophysique et Géophysique” (CRAAG), in charge of the Algerian Seismological Survey, provides, for each earthquake, the parameters of the macroseismic intensity (I0), the epicenter location and the duration magnitude (Md). The catalog of Algerian earthquakes contains data represented mainly by maximum intensity I0 (for historical seismicity and mostly pre-instrumental earthquakes era) and duration magnitude Md for most of the instrumental seismicity. A previous study by Hamdache et al. (Hamdache et al., Seismol Res Lett 81:732–739, 2010) produced a unified catalog of the main seismic event in Algeria. This study aims to homogenize the Algerian seismic catalog and to achieve its completeness by determining empirical relations converting Md and I0 (given by CRAAG) to Mw, Ms, mb (given by international seismological agencies). To compute the relationship between intensity and magnitudes, we adopted Linear Orthogonal Regression applied to the dataset we selected. Our catalog is now complete and homogeneous, and Mw, Ms and mb were assigned for historical earthquakes. This will be useful for earthquake engineering and for those dealing with seismic hazard assessment in the Tell Atlas (Algeria), where several urbanized large cities are under the threat of strong earthquake, as is the case for Algiers capital city. The recent urban development in countries with catalogs limited primarily to macroseismic data increased the need for useable relations to convert epicentral intensities to instrumental magnitude mb, Ms or Mw.
      PubDate: 2022-08-28
       
  • Detection of faults from 2D seismic data using multi-attribute analysis
           and artificial neural network: a case study from Nekor Basin, North
           Morocco

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      Abstract: Abstract Al Hoceima region, located in northern Morocco, is frequently stroked by earthquakes associated with tectonic faults in and around the Nekor Basin. In particular, the Al Hoceima area is crossed by a network of active faults, indicating the undergoing of this region under active deformation associated with the convergence between Africa and Eurasia. Here, we attempt to highlight a set of faults from 2D seismic data acquired over the Nekor Basin using artificial neural networks (ANNs) combined with seismic attributes. We condition the seismic data to remove random noise and expose the geological structures, and then we use it to define a group of attributes sensitive to the presence of faults. The selected attributes were trained through a fully connected multi-layer perceptron (MLP) on fault, and non-fault locations picked manually over seismic data to generate a single attribute referred to as fault meta-attribute probability. The generated fault meta-attribute probability has successfully illuminated geological discontinuities with efficiency. It is observed that in the western part of the study area, the fault probability has brought out thinned and sharpened fault images from seismic data, whereas the efficiency of this meta-attribute decreases towards the east due to the presence of noise around the fault’s positions. Based on these results, the interpretative approach followed in this work demonstrates the effectiveness of using machine learning and automatic methods on imaging geological structures from seismic data. We expect that these results can be used directly as input data in seismic hazard studies in this region.
      PubDate: 2022-08-25
       
  • Exploiting the legacy of N.N. Ambraseys: known and unknown earthquakes in
           the Anatolian area

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      Abstract: Abstract N.N. Ambraseys left us a wealth of papers and volumes on a number of topics; many of them concern the historical earthquake investigation. One of the last works is the 2009 volume (Ambraseys in Earthquakes in the Eastern Mediterranean and the Middle East: a multidisciplinary study of 2000 years of seismicity, Cambridge, Cambridge, UK, 2009), where he summarizes the results of more than thirty years of investigation through archives and libraries, covering earthquakes of a large area, from Albania to Caucasus. For each earthquake, a short summary of the main effects is supplied, together with the list of the sources used. Such information is intended as material for assessing location and size of the earthquakes, task that the author accomplished only in a very preliminary way for a few earthquakes, only. In addition to exhaustive descriptions of the most known earthquakes and the relevant historical sources, the volume contains information on a large number of earthquakes, so far unknown to the current earthquake catalogues. This paper intends to represent a homage to his immense work, partially showing the potential of his volume. We briefly present here some case histories, including the preliminary location and size of the earthquakes – known and unknown—around Anatolia. We add some examples of how he was able to prove that some alleged earthquakes are actually to be considered as fake or very doubtful. We also present the damage information supplied for some known and unknown earthquakes, and how they can be used for assessing location and size of them.
      PubDate: 2022-08-23
       
  • An inventory of coastal spits of the eastern Mediterranean and Black seas

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      Abstract: Abstract Coastal spits are low-lying landforms at the depositional shores and seem to be relatively young and vulnerable formations formed under the control of both terrestrial and marine environments. These features reflect the sedimentary and hydrodynamic characteristics of the relevant shores. They can develop in critical environmental conditions depending on high sediment supplies and shallow coastal platform settings with relatively low energies. Therefore, spits play a crucial role in understanding and interpreting the development of relevant coasts. In this study, we examined the shores of the eastern Mediterranean Sea and the Black Sea based partly on field observations and mostly on remote sensing analyses. In addition, we correlated the modern and older spit examples of the Azov Sea based on detailed maps prepared by an English marine explorer approximately two hundred years ago. Correlation shows that spits were destructed in time, diminishing their width by about one-fourth. The eastern Mediterranean region includes 82 spits, some of which are the longest examples in the world, reaching 112 km long (Lake Bardawill at the Levant Sea and Arabat at the Black Sea). Nearly half of them are shorter than 1000 m. We observed 18 spits (22% of total spits) along the coasts of the Levant Sea, 16 (19.5%) in the Aegean Sea, and 7 (8.5%) in the Sea of Marmara, and 41 (%50) in the Black Sea. 35 (42.7%) of them are seen on the coasts of Türkiye, which has the longest coast in the eastern Mediterranean Sea. A relative abundance of spits in the study area is found at the northeastern coasts of the Black Sea from Batumi to the Crimean Peninsula. Correlations within the studied coasts inspire that sediment supply and waves are the most effective agents for the development of spits. However, all are threatened by anthropogenic factors due to either touristic activities or sand mining. An efficient conservation program for the eastern Mediterranean Sea coasts is urgently needed.
      PubDate: 2022-08-14
       
  • Seismicity of northern Algeria: performance of local networks

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      Abstract: Abstract During the past decades, there was a remarkable rebound in seismicity studies in northern Algeria, where almost all moderate earthquakes were thoroughly studied and result published. This fact was made possible by the deployment, extension and modernization of local seismological networks. In this work, 20 earthquakes (4.5 ≤ Mw ≤ 5.9) occurred in the Tell Atlas of Algeria for the period (2006–2021) and recorded by many digital stations of the national accelerograph network are considered. First, we located hypocenters of the events. Second, we performed a waveforms inversion of accelerograms to describe the seismic source (seismic moment, moment magnitude and focal mechanisms of the corresponding earthquake). The hypocenters are well constrained better than those provided by international organisms, while the magnitudes and focal mechanisms are comparable. In the western Tell Atlas, the focal mechanisms often yielded reverse faulting, while in eastern Algeria, they showed often strike slip solutions. The instrumental seismicity often occurred inside or around Neogene basins, known already to have experienced historical seismicity.
      PubDate: 2022-08-13
       
  • The history of seismology and historical seismicity in Algeria: an
           overview

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      Abstract: Abstract Algeria is one of the most seismically active areas along the Nubia-Eurasia convergent plates boundary. It is well known that the instrumental records of seismic events are incomplete because of inadequate instrumentation and the poor coverage of seismogenic areas from 1900 until the installation in 1992 of the Algerian Telemetered Seismological Network. The available catalogues of the seismicity of Algeria, including several published research papers on the same topic, reported numerous destructive earthquakes striking several regions, particularly along the coast [Oran, Mascara, Chlef (Former Orléansville and El Asnam), Tipasa-Chenoua, Algiers, Zemmouri, Constantine, Béjaia, Djidjelli (5.9 < M < 7.3; IX < Io < X]. This seismicity is the result of the collision between the Nubia and Eurasian plates and is located within the Algerian Tell Atlas. To properly study the seismicity of Algeria, we must consider three periods in relation to the installation of the seismic instrumentation over the Algerian territory: (1) the pre-1910 period with the first published seismic catalogues, (2) the post-1910 period with the beginning of the instrumental seismicity and, finally, (3) the post-1980 period with the installation of the Algerian Teleseismic Network in 1990 and its upgrade following the Zemmouri earthquake of May 21st 2003.
      PubDate: 2022-08-12
       
  • A unified MW parametric earthquake catalog for Algeria and adjacent
           regions (PECAAR)

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      Abstract: Abstract This study compiles a parametric earthquake catalog covering Northern Algeria and its adjacent areas from 1658 to 2018. The choice of moment magnitude MW as a unified scale of the compiled catalog ensures the non-saturation of the magnitude for large magnitude events and direct link or access to the physical parameters of the ruptured faults. The compilation process was performed based on data merging from various national and international heterogeneous magnitude sources together with intensity sources from the historical period. Several empirical relationships have been used to link different magnitude scales and intensity, namely Imax, mb, mbLg, MD, ML and MS. In addition, a new set of empirical relationships was established using the General Regression Method (GOR) to link the local magnitude ML and the duration magnitude MD scales used by the Algerian (CRAAG) and Tunisian (NIMT) national seismological agencies, respectively. The obtained earthquake catalog (PECAAR) includes 11,084 events that occurred during the period from 1658 and the end of 2018, with magnitudes MW ≥ 2.8, registered within the area delimited by longitudes 3° W and 10° E and latitudes 32° N and 38° N. The analysis of time variation of the magnitude of completeness mc estimated using the Maximum Curvature method reveals that mc drops to about 4 and 3 starting from 1840 and 1997, respectively. In space, the recent distribution of the magnitude of completeness estimated using the last decade’s data shows quite stable values ranging between 2.8 and 3.4.
      PubDate: 2022-08-09
       
  • Underlying Châteauneuf-du-Pape is a salt diapir and the still active
           Nîmes Fault of southeastern France

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      Abstract: Abstract The shallow earthquake of November 11, 2019, at Le Teil and the catalogue of historic seismicity in the SE Basin, together record diffuse seismicity along high-angle faults associated with rift structures of the Tethyan margin. In addition to several evidences of Quaternary surface co-seismic ruptures, archeogeological data suggest at least one highly damaging earthquake in Roman times. Regional seismic profiles currently help define the complex tectonic structure and the Plio-Quaternary slip history of these faults. The surface trace of these faults is not connected to off-sets in the basement level owing to several decollement levels within the Triassic salt, deeper Carboniferous coal measures and shallower Jurassic and Cretaceous blackshale horizons. Analogous to the Northern Apennines, brittle failures along the faults of the SE Basin may occur only within the deep crystalline basement and shallow carbonate layers, while salt and shale horizons deform ductilly. In this context, the salt diapir beneath the Châteauneuf-du-Pape has caused progressive uplift and bending of alluvial terraces throughout the Quaternary. These faults pose a potential danger to nuclear plants and several cities. Regional deep seismic profiles would be required to define the architecture of the fault system within the infra-Triassic substratum. The acquisition of high resolution seismic profiles in the areas where these faults are covered by thick Plio-Quaternary deposits would also provide data to date and quantify the successive episodes of fault reactivations and deformations. Long-term GPS measurements within the different fault blocks also would be required to quantify both the vertical and horizontal motion of each block relative to the others. Ultimately, a denser seismological network is needed to properly locate the focal mechanisms at depth and plot them on an accurate 3D structural model of the regional fault system.
      PubDate: 2022-07-29
       
  • Was the north-west African coast area free of disastrous earthquakes
           during the Roman period'

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      Abstract: Abstract This study focusses on earthquakes in the NW Africa coast during the Roman period (circa 100BC–AD500). For this period, only one earthquake is known from written sources and two from inscriptions explicitly mentioning seismic events. Hence, the corresponding apparent seismicity rate is too small compared to the rate of the instrumental period. This apparent deficit may be due (1) to an interval of seismic quiescence of the North Africa compressional front or (2) to silence of historical sources. To shed light to this problem, seen from a broader perspective, a systematic study of the Roman literature focussing on earthquakes and related effects on a regional scale has started some time ago. A first result is that since the middle of the fourth century AD earthquakes were a tool of propaganda between Christians and pagans, hence any reference to earthquakes in this period, usually vague, should be treated with much care. Methods to decode and evaluate this type of information are discussed, and in addition it is highlighted that the recent digitalization of historical sources opens new ways in earthquake studies. This study represents a tribute to Assia Harbi, whose research covered ancient earthquakes and which unfortunately remained uncomplete.
      PubDate: 2022-07-24
       
  • Combining earth sciences with archaeology to investigate natural risks
           related to the cultural heritage of the Marsica region (central Apennines,
           Italy)

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      Abstract: Abstract Methods of Earth Sciences have been employed in archaeological sites of the Marsica region, central Italy, in two different perspectives: to enhance knowledge on past natural events which damaged/destroyed ancient settlements/monuments and to gather data useful/necessary for preservation of the local cultural heritage. Within this wide perspective, the paper deals with (i) recent archaeoseismological investigations at Alba Fucens and other sites of the Fucino Plain which add evidence of sudden building collapse to the already available (archaeoseismological and paleoseismological) data concerning seismicity of fifth-sixth century AD; (ii) archaeological investigations on remains of the Medieval church of San Bartolomeo showing that coseismic damage in 1349 caused the abandonment of part of the building and its (re)use for burials; (iii) evidence of slope instability which caused rapid mass deposition in the lowest sector of ancient Alba Fucens since around the half of the sixth century AD, inhibiting the occupation of the Roman town; (iv) capable faulting potentially affecting the westernmost sector of the huge hydraulic works made by Romans during the first-second century AD to drain former Lake Fucino.
      PubDate: 2022-07-09
       
  • Earthquakes, tsunamis, dried harbours and seismic coastal uplift: evidence
           from the Eastern Mediterranean

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      Abstract: Abstract Certain reports of historical earthquakes contain references to “dried up” harbours and to coastal uplifts, which are regarded as evidence of tsunamis and exaggerations, respectively. A few such cases were found in a detailed earthquake catalogue for the Eastern Mediterranean, and they were investigated mainly examining local coastal morphologies. A coastal seismic uplift along the coast of Latakia, Syria, following the 1796 earthquake, and a possible seismic uplift and then silting of the harbour of Paphos, Cyprus, following the 1222 earthquake were documented. In Latakia, two fossil shorelines, in combination with Late Holocene and Pleistocene notches farther north, in the innermost part of the Eastern Mediterranean, testify to reactivation of oblique faults along the coasts and a transpressional tectonic regime at the convergence of plate boundaries (Dead Sea Fault, East Anatolian Fault, Cyprus Arc). Coastal uplifts are not unusual in the Eastern Mediterranean, but they are rarely reported, because the perception of hazards of the sea is sinking and flooding.
      PubDate: 2022-07-06
       
  • Coseismic and cumulative costal deformations along the 2003 Zemmouri
           earthquake area (Mw 6.8, Tell Atlas, Algeria)

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      Abstract: Abstract Coastal tectonics in seismically active regions often leaves geomorphological and tectonic markers with cumulative uplift. We studied the late Quaternary tectonic geomorphology in the Zemmouri earthquake (21 May 2003, Mw 6.8) area and its correlation to the coseismic coastal uplift in the Tell Atlas (Northern Algeria). The average 0.55 m coseismic uplift along the ~ 60-km-long coastline is compared to the late Quaternary geomorphological changes that include alluvial and marine terraces distribution and drainage system distribution. Field investigations are coupled with aerial photographs, high-resolution Pleiades satellite images and digital elevation models (extracted from Pleiades tri-stereo images, SRTM 1″ and ASTER Global). Uplifted marine and alluvial terraces, distribution of drainage network with river mouth migrations and convex shape of most river channel profiles document the coastal late Quaternary deformation. Morphometric parameters applied to the rivers and streams illustrate the effect of vertical movements on the landforms and channels in the Zemmouri coastal area, Upper Pleistocene and Holocene marine terraces, and paleo-wave-cut notch levels reveal ~ 0.3 mm/yr uplift rate between 130 and 30 ka and increases to reach 1.7 mm/yr during late Pleistocene and Holocene. This rate is consistent with the seismotectonic (fault geometry and earthquake mechanisms) and geodetic (InSAR and GPS) results. The tectonic geomorphology with the characterization of coastal uplift is critical for the long-term active tectonics and seismic hazard assessment in the Tell Atlas of Algeria and along the Africa–Eurasia plate boundary.
      PubDate: 2022-05-16
       
  • The palaeoenvironment and the environmental impact of the Pre-Pottery
           Neolithic Motza megasite and its surrounding Mediterranean landscape in
           the central Judean Highlands (Israel)

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      Abstract: Abstract One of the largest prehistoric settlements in Israel and Jordan was uncovered by the Motza salvage excavation in the largest and deepest drainage basin of the Judean highlands in central Israel. On a fan-shaped piedmont-like slope probably developed from Neolithic waste and materials and covering more than 0.5 km, the Motza “megasite” comprises more than 1,200 excavation squares, each measuring 25 sq.m. Plastered structures, a rich artefactual assemblage and a distinct unit of angular clasts containing artefacts dating mainly to the final stage of the Pre-Pottery Neolithic B (PPNB) period suggest a significant engagement with surrounding resources. A geospatial analysis of the Motza region is presented with preliminary artefactual, geoarchaeological and analytical results from the excavation and a review of regional palaeoclimate, palaeoenvironment and geoscientific studies. The present and past geomorphic processes, and the hydrology of the site’s environs are assessed and their influence on-site selection and sustainability are discussed. The Early Holocene palaeoclimatic and palaeoenvironmental conditions during a geomorphic time-window help to explain the Neolithic climax that apparently generated a reasonable ecogeomorphic impact, probably for the first time in the region. However, this review cannot offer deterministic explanations, especially regarding the abandonment of the megasite. The limitations of palaeo-reconstruction and the impact of recycled landscapes and intensive early modern-to-modern land use are discussed, along with the contribution of the occupiers of the megasite to shaping the regional Mediterranean landscape to the present day.
      PubDate: 2022-04-23
       
  • The embryonic apparatus is smallAtlas of the Tethyan orthophragmines

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      Abstract: Abstract Orthophragmines are a group of discoidal, lenticular or stellate ‘orbitoidal’ larger benthic foraminifera that thrived in shallow-marine environments in low-to-middle latitudes during the late Paleocene and Eocene. They consist of two phylogenetically independent families with similar morphology, such as Discocyclinidae (with two Tethyan genera—Discocyclina and Nemkovella) and Orbitoclypeidae (with three genera—Orbitoclypeus, Asterocyclina and Hexagonocyclina in the Tethys) distinguishable by the different microspheric juvenarium of the microspheric (B) forms. Sixty-one species of orthophragmines are herein described and illustrated based on material from various Tethyan localities in Europe, North Africa, Turkey, the Arabian Peninsula, the Indian Subcontinent and SE Asia. Thirty-two species of Discocyclina, six species of Nemkovella, thirteen species of Orbitoclypeus, nine species of Asterocyclina and one species of Hexagonocyclina are included. Some species include chrono-subspecies, established by applying the principles of embryonic and nepionic acceleration in the megalospheric (A) forms, primarily expressed by the increase in the size of the deuteroconch, morphological modifications forming various embryonic configurations through the phylogeny, and the increase in the number of adauxiliary chamberlets that arise from the embryonic apparatus. This study is mainly based on investigating oriented sections of many free specimens, and some random rock thin sections where obtaining free tests of orthophragmines was not possible. The Atlas is designed as a laboratory handbook for micropaleontology students and a guidebook to assist professionals with the easy identification of orthophragmines in thin sections.
      PubDate: 2022-03-30
       
  • Geochemical insights into mantle metasomatism from cogenetic plutonic
           xenoliths in pyroclastic deposits of Gölcük volcano and their alkaline
           host rocks (Isparta, SW Turkey)

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      Abstract: Abstract Lower Pliocene–Quaternary Gölcük volcano in SW Turkey, represented by potassic to ultrapotassic alkaline volcanics, is a well-preserved example with pre- and post-caldera volcanism comprising caldera-forming deposits, maar structures, and lava/dome flows. It has a 4 × 5 km diameter summit caldera. The volcanological history of the volcano is divided into two stages: (i) pre-caldera volcanism: intrusive and extrusive lavas including basaltic trachy-andesitic dykes; trachy-andesitic, trachytic and trachy-dacitic lava domes and caldera-forming eruptions. (ii) Post-caldera volcanism: intra-caldera tephriphonolitic lava/dome extrusions along the caldera rim, phreatomagmatic eruptions and finally intra-caldera trachytic domes. Post-caldera phreatomagmatic activity is represented by maar systems, containing ultramafic to felsic plutonic xenoliths having composition of generally phlogopite clinopyroxenite, monzonite and syenite. Phlogopite clinopyroxenite contain clinopyroxene, phlogopite and plagioclase. Monzonitic and syenitic xenoliths include orthoclase, plagioclase, hornblende, clinopyroxene, biotite, nepheline and apatite, sphene as accessory phases. Mineral chemistry and geochemical variations combined with petrographical and textural features of plutonic xenoliths and their host rocks reveal derivation from a common mantle source and the noticeable role of metasomatism. High (La/Yb)n (29–77) and low Ti/Eu (590–2010) ratios of host rocks and variations between Mg# (64–90) and Ca/Al ratio (4–22) of clinopyroxene imply that lithospheric mantle beneath Gölcük volcano was modified by both carbonate and silicate melts risen from the asthenosphere. Infiltration of these metasomatic melts within the overlying lithospheric mantle leads to the formation of amphibole/phlogopite-rich veins. Fractional crystallization following the partial melting of these veins and surrounding lithosphere caused the evolution of Gölcük magmas. Further, clinopyroxene-based thermometry of plutonic xenoliths indicates crystallization at crustal levels, ranging between 3 and 33 km.
      PubDate: 2022-03-14
       
  • Climate change and groundwater resources availability in the Great Limpopo
           National Park (Mozambique): the current state of knowledge

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      Abstract: Abstract This work outlines a comprehensive study of groundwater resources supply in Mozambique’s Great Limpopo National Park buffer zone in Southern Africa. To protect biological diversity and the water resources supply of dispersed communities of the buffer zone is a crucial problem to fix people in the region and, in the meantime, to boost the development of the Limpopo National Park. This work shows the current state of knowledge about this topic and try to point out some suggestions on technical solutions. Some previous studies concluded that two different main factors make a complex water supply in this area: (i) the rainwater distribution, it is hard to transform the rainwater into groundwater resources available for exploitation, and (ii) the common groundwater resources, rich in elements such as Boron (B), Mercury (Hg), Uranium (U), Zinc (Zn) and Lead (Pb). The occurrence of these elements is linked to the presence of groundwater with long residence times, unsafe for people’s health. The methodological approach adopted has been to assess the potential infiltration, applying the inverse hydrogeological budget technique, starting from the main outcropping geological units, in the study area. Due to the lack of meteorological data referred to Limpopo National Park, the gauge stations located in the Kruger National Park during the last 64 years have been, on the whole, considered. The target of the study has been to assess the trend of meteorological data and understand how precipitations could affect groundwater recharge and their availability. Without a strategy of biodiversity conservation and sustainable water resources management, they cannot be reached and guaranteed healthy conditions for local dispersed communities. A hydrogeoethical responsible approach is essential to protect biological diversity and hydrosocial cycle framework with integrative ecosystem services and nature-based solutions.
      PubDate: 2021-10-27
       
 
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