Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

GEOPHYSICS (33 journals)

Showing 1 - 31 of 31 Journals sorted alphabetically
Acta Geologica Polonica     Open Access  
Artificial Intelligence in Geosciences     Open Access   (Followers: 6)
Chinese Journal of Geophysics     Full-text available via subscription   (Followers: 1)
Contributions to Geophysics and Geodesy     Open Access   (Followers: 1)
Energy Geoscience     Open Access  
Eos, Transactions American Geophysical Union     Open Access   (Followers: 5)
Geodesy and Cartography     Open Access   (Followers: 2)
Geodesy and Cartography : The Journal of Committee on Geodesy of Polish Academy of Sciences     Open Access   (Followers: 2)
Geodesy and Geodynamics     Open Access  
GeofĂ­sica internacional     Open Access  
Geology, Geophysics and Environment     Open Access   (Followers: 1)
GEOMATICA     Hybrid Journal  
Geomechanics and Geophysics for Geo-Energy and Geo-Resources     Hybrid Journal  
Geophysical Research Letters     Full-text available via subscription   (Followers: 179)
GeoScience Engineering     Open Access  
Geothermal Energy     Open Access   (Followers: 5)
GIScience & Remote Sensing     Open Access   (Followers: 54)
Greenhouse Gases : Science and Technology     Hybrid Journal   (Followers: 4)
Interpretation     Hybrid Journal   (Followers: 1)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 3)
Journal of Remote Sensing & GIS     Full-text available via subscription   (Followers: 38)
Journal of the Earth and Space Physics     Open Access   (Followers: 9)
Near Surface Geophysics     Open Access   (Followers: 1)
New Zealand Journal of Geology and Geophysics     Hybrid Journal   (Followers: 6)
NRIAG Journal of Astronomy and Geophysics     Open Access   (Followers: 4)
Physics and Chemistry of the Earth, Parts A/B/C     Hybrid Journal   (Followers: 10)
Research in Geophysics     Open Access   (Followers: 5)
Results in Geophysical Sciences     Open Access  
Reviews of Geophysics     Full-text available via subscription   (Followers: 49)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Similar Journals
Journal Cover
Contributions to Geophysics and Geodesy
Journal Prestige (SJR): 0.199
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1335-2806 - ISSN (Online) 1338-0540
Published by Sciendo Homepage  [370 journals]
  • Magnetic field analysis using the improved global particle swarm
           optimization algorithm to estimate the depth and approximate shape of the
           buried mass

    • Authors: Mahdieh HEIDARI; Mirsattar MESHINCHI ASL, Mahmoud MEHRAMUZ, Reza HEIDARI
      Abstract: In this paper, the optimization algorithm based on the population as improved global particle swarm optimization is described and used for inverse modelling of two-dimensional magnetic field data. This algorithm is able to estimate the parameters of depth, shape factor, amplitude coefficient, magnetic inclination angle and origin point coordinates. To evaluate the efficiency of this method, the magnetic field of an artificial model was analysed, with and without added random noise. The results suggest that the proposed algorithm is capable of model parameter estimation with high accuracy. Accordingly, the improved global particle swarm optimization algorithm was used to analyse the magnetic field of the study area in the Ileh region in Iran located in Taybad city. The study area is very rich in terms of iron resources. The estimate for the study area is that the depth of the buried mass centre is about 114.9 m and its approximate shape is similar to a horizontal cylinder based on the calculated shape factor value which is 1.76. The calculated depth is an acceptable match with the average depth of drillings.
      PubDate: Thu, 21 Jul 2022 18:52:15 +000
       
  • Integrated AVO inversion and seismic attributes for tracing hydrocarbon
           accumulation in Kafr El-Sheikh Formation, South Batra field, Nile Delta,
           Egypt: A case study

    • Authors: Mohamed Mostafa GOBASHY; Aia Mohamed Fathy DAHROUG, Ahmed Hussein ZAKARIA, Amr Mohamed SALAHELDIN, Sharafeldin Mahmoud SHARAFELDIN
      Abstract: Utilizing advanced seismic techniques for delineating hydrocarbon accumulations in HST (High Stand System Tract) turbidite channel of Kafr El-Sheikh (KS) formation (Pliocene Age) located in the western part of South Batra field (SBF), Nile Delta – Egypt is investigated. 3D seismic data and four well logs helped in studying the properties of the channel. Three wells encountered the central part of the channel and showed thicker reservoir thickness than the fourth well, which encountered the levee. The channel is characterized by high porosity (25–30%) and relatively low water saturation (27–50%). The structural map showed that the channel is dipping towards the NE–SW. AVO analysis, scaled Poisson's ratio, post-stack seismic inversion, and seismic attributes confirmed the presence of Class III gas sand. Variance attribute helped in imaging the channel and faults. Maps generated from spectral decomposition showed that the dominant frequency is around 15 hertz. Results of integrating different techniques were consistent and successfully helped in determining the geometry of the channel, discriminating between different lithologies and fluids, in addition to delineating the sweet spots and recommended locations for drilling.
      PubDate: Thu, 21 Jul 2022 18:51:39 +000
       
  • Joint geomorphological and geophysical (electrical resistivity)
           investigation for the configuration of soil pipe

    • Authors: Ujjal K. BORAH; Alka GOND, Prasobh P. RAJAN, Rajappan SIVAN, Nandakumar VIVEKANANDAN
      Abstract: Soil piping is a complex mechanism of subsurface soil erosion, which results underground conduits (cave/tunnel) of varying dimensions. Soil piping associates with severe consequences, such as land subsidence and land slide. Therefore, the investigation of soil pipe is crucial. However, the study of soil pipe is challenging unless characteristic surficial evidences of the pipe are available. Based on the surficial evidences, soil pipe can be configured with geophysical techniques which in-turn aid in designing precursory measures. Therefore, in the present study, we carried out a combined geomorphological and geophysical investigation to configure the soil pipe at Kinanoor village, Kasaragod, Kerala, India. Based on the vital geomorphological information, we carried out resistivity survey and configured an underground soil pipe of diameter ∼6.5 to 7 m that is seated ∼3 m beneath the surface. This hollow pipe is underlain by the only accessible road of that locality which makes the road vulnerable for transportation. Therefore, a bridge like structure is recommended to construct at the pipe location to stabilize the risk factor. Since the study area is situated on a fringe-slope, the geomorphological investigation points out that the disturbance in natural course of the drainage system and the accumulation of water in the up-slope area due to the man-made activities might act as potential causes for the piping in the area. Therefore, it is suggested not to disturb the natural course of the drainage which may lead to subsidence of the area in future.
      PubDate: Thu, 21 Jul 2022 18:49:45 +000
       
  • Seismic reservoir characterization and pressure depletion of the Abu Madi
           Formation in the NW Khilala field, onshore Nile Delta, Egypt

    • Authors: Nadia Abdel FATTAH; Ibrahim Mohamed IBRAHIM, Manal ELKAMMAR
      Abstract: The Late Messinian Abu Madi Formation represents the most prospective deep reservoir target in the Nile Delta. Hydrocarbon exploration in the Nile Delta over the last few decades has been targeted to understand the Abu Madi reservoir quality and distribution. The integration of rock physics, amplitude versus angle (AVA), seismic interpretation, seismic attributes, and seismic inversion could successfully determine the characteristics of the late Messinian Abu Madi Formation in the North West Khilala (NWKh) field, which is located in the central onshore part of the Nile Delta, Egypt. The NWKh field is located on the eastern margin of the Disouq concession close to producing the West Khilala (WKh) field, with highly heterogeneous reservoir parameters. The reservoir is classified as lacustrine turbidites deposited in semi-isolated Late Messinian Basins. The Abu Madi Formation can be subdivided into upper and lower sand members. It is very common that they are separated by an intraformational shale layer. AVA analysis performed on the top of the Abu Madi reservoir suggested a class 2p. Seismic data were inverted to delineate the overall lateral extent of the reservoir. The prestack inversion process was integrated with rock physics modelling of the wells to generate high-resolution multiple rock property models to characterize the reservoir and observe or investigate different pressure depletion trends. The pressure depletion of the lower Abu Madi in the North West Khilala field was investigated laterally and vertically by the relative/full spectrum inversion and formation modular dynamic tester (MDT) pressure data, respectively. This depletion is due to communication with the West Khilala field, which was produced from the Lower Abu Madi (LAM) sand interval in 2007.
      PubDate: Thu, 21 Jul 2022 18:49:14 +000
       
  • ULF geomagnetic anomaly associated with the Sumatra-Pagai Islands
           earthquake swarm during 2020

    • Authors: Marzuki MARZUKI; Muhammad HAMIDI, Suaidi AHADI, Ardian PUTRA, Afdal AFDAL, Harmadi HARMADI, Dwikorita KARNAWATI, Hendra Suwarta SUPRIHATIN, Muhammad SYIROJUDIN, Indah MARSYAM
      Abstract: Observations of earthquake precursors via geomagnetic anomalies from ultra-low frequency (ULF) could provide an expectation for short-term earthquake prediction. However, there are still several obstacles in determining this precursor, one of which is the presence of a precursor bias if the earthquake occurs at a close time and location. To cope with this problem, we analysed six earthquakes with a magnitude >5 on Pagai Island, Mentawai, Sumatra, during 2020. These earthquakes have epicentres close to each other and occur within a short time (one month). This study used geomagnetic data recorded by the Magnetic Data Acquisition System (MAGDAS) magnetometer network at Sicincin station (SCN), West Sumatra, and Kepahiyang station (KPY), Bengkulu, with a span of one month before the earthquake. The anomaly of ULF emission was analysed using the power spectral density method at a frequency of 0.012 Hz for the H and Z components of the geomagnetic data. The onset time of the ULF emission anomaly was determined by the standard deviation value (pz + σ, pz – σ) of the SZ/SH power ratio polarization. The disturbance storm time index (Dst) was used to ensure that the anomaly occurred was not caused by geomagnetic storm. Also, the single station transfer function was used to calculate the azimuth, and the empirical formula between the anomaly amplitude and the magnitude was used to calculate the earthquake magnitude as the validation of the anomaly source. Several ULF anomalies as earthquake precursors were observed, especially at the KPY station. The estimated azimuth shows a good accuracy compared to the earthquake's azimuth, with an average value of 97.8%. Furthermore, the earthquake magnitude calculated from the ULF anomaly shows a good agreement with the actual earthquake magnitude, with an average accuracy of 98.13%. 
      PubDate: Thu, 21 Jul 2022 18:48:20 +000
       
  • A multiparametric approach for rejuvenation of the Gaurikund geothermal
           spring system in the Northwest Himalayan region

    • Authors: Anurag KHANNA; Debasish BAGCHI, Suresh KANNAUJIYA, Tandrila SARKAR
      Abstract: The Gaurikund town falls on the way of the famous trekking route to Kedarnath that faced the wrath of the 2013 flood disaster. This fateful event severed more than 5000 casualties, demolished several infrastructures, and shifted the course of Gaurikund spring from its original position. Nevertheless, the Gaurikund geothermal spring system located in the Himalayan Geothermal Belt of the Garhwal region is preeminent for religious beliefs, balneotherapeutic values and a gateway to delve within the geothermal and hydrological characteristics of the area. In this perspective, restoration of Gaurikund geothermal spring system becomes a necessity. A multiparametric approach comprising geospatial, geology, hydrochemistry and geophysics has been used to study and justify these aspects at Gaurikund. The geological studies infer that the geothermal spring gets recharged by the steep, southerly dipping joints in granite gneiss. Subsequently, the deep percolated water heats up due to the high geothermal gradient and then emerge along the Vaikrita Thrust and its sympathetic minor fault-thrust system by advection. Moreover, four spring outlets are inventoried, with discharge varying from 7.46 to 95.54 L/min. The normal emissivity model uses the pre and post-disaster satellite data and generates maximum kinetic temperature images, showing a positive correlation between land surface temperature and spring discharge. Two-dimensional Electrical Resistivity Tomography (Schlumberger, Wenner and Gradient configurations) survey revealed two low resistivity zones proximal to the geothermal spring on the right bank of the Mandakini river. The engineering interventions carried out by bank protection and construction of small gully plugs in the catchment area is recommended along Gaurikund-Sonprayag section on the right bank of Mandakini river.
      PubDate: Thu, 21 Jul 2022 00:00:00 +000
       
 
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