Article
Geochemistry & Geophysics
Franck Eitel Kemgang Ghomsi, Robert Tenzer, Emmanuel Njinju, Rebekka Steffen
Summary: The West and Central African Rift System is a unique stable continental structure formed by large-scale topographic swells. Through the use of global gravitational and topographic-bathymetric models, researchers were able to determine the crustal structure and Moho depth variations in different regions of the WCARS. The findings also shed light on metacratonization processes that occurred during the Neoproterozoic.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Wei-Kai Li, Qing-Lu Mu, Meng Yang, Wei Feng, Min Zhong
Summary: Mo determination is important for studying the Earth's interior structure, and can be recovered using gravimetric data based on the isostasy-compensation hypothesis in geodesy. An improved iterative inversion method combining 3-D integration and linear regularization is proposed to solve the nonlinear problem of isostasy. Two joint inversion scenarios utilizing horizontal components and all non-vertical components of the gravity-gradient tensor from GOCE are developed. The study provides new insights into the tectonic structure of the Qinghai-Tibet Plateau based on high-precision satellite gravimetry.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Sungchan Choi, Sung-Wook Kim, Eun-Kyeong Choi, Young-Cheol Lee
Summary: The Jeokjung-Chogye Basin (JCB) is the first impact crater discovered in the Korean peninsula. The geometric center of the exterior crater rim is marked by an elevation higher than 200 meters. The diameters of the peak ring and uplift ring are calculated to be approximately 4000 and 1500 meters respectively, with a depth discrepancy of around 200 meters indicating a rise in bedrock under the uplift ring following the meteorite impact.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Sungchan Choi, Sung-Wook Kim, Eun-Kyeong Choi, Young-Cheol Lee
Summary: The Jeokjung-Chogye Basin (JCB) is the first impact crater discovered in the Korean peninsula, with a complex geological structure consisting of multiple ring structures on the exterior crater rim. Analysis of geological features and gravity field data suggests that the crater was formed by a steeply inclined impact from the eastern direction at 50-60 degrees to the horizontal.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Jinyun Guo, Hongxin Luo, Chengcheng Zhu, Hui Ji, Guowei Li, Xin Liu
Summary: The HY-2A satellite and CryoSat-2 altimetry data were used to construct marine gravity anomaly models in the Gulf of Mexico. The accuracy of HY-2A-derived gravity anomalies was compared with that of CryoSat-2 and found to be similar, indicating the potential of HY-2A data in constructing high-precision global/local marine gravity models.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Jonathan Carrillo, Marco A. Perez-Flores, Luis A. Gallardo, Eva Schill
Summary: Current geophysical joint inversion methods can be roughly divided into structurally or property driven. While structural coupling plays a key role in fully heterogeneous environments, it is blind to the actual physical properties, which limit its application. On the other hand, approaches based on direct property-correlations promise strong coupled models using petrophysical linkages derived from rock physics or through the search for cross-property relationships in the objective function directly. The Correspondence Maps (CM) methodology has the potential to allow a gradual property variation that is not restricted to a predetermined number of homogeneous zones.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Osama Elghrabawy, Khaled Khalifa
Summary: This study presents a 3-D stripping inversion over the Hodein Basin area in the Southeastern Desert using the Fourier approach and evaluates the method based on data constraints. The results show that the study area is characterized by a broad basin directed in the NW direction and dissected by normal faults, forming small subbasins.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Christian Olaf Mueller, Jacob Waechter, Christoph Jahnke, Emilio L. Pueyo Morer, Florian Riefstahl, Alexander Malz
Summary: This study presents an integrated geological and gravity modelling approach to harmonize two geological 3D models of the North German Basin in the cross-border region between Saxony-Anhalt and Brandenburg. Gravity gradient calculation and Euler deconvolution are used to reveal new insights into local fault systems and gravity anomaly sources. The resulting geological 3D model consists of harmonized interfaces and is consistent with the observed gravity field.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yunus Levent Ekinci, Caglayan Balkaya, Gokhan Gokturkler, Senol Ozyalin
Summary: The study focused on the Aegean Graben System in western Turkey, using differential evolution algorithm (DEA) to invert the depths of sediment cover-metamorphic basement. Parameterization was done through discretizing the basins into vertical blocks, and mathematical nature of the inverse problem was explored. Both synthetic and field data inversions showed that the maximum depths to the metamorphic basement reliefs in the grabens are shallower than previous findings, with the sediment thicknesses resolvable.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Dan Zhu, Xiangyun Hu, Shuang Liu, Hongzhu Cai, Shan Xu, Linghui Meng, Henglei Zhang
Summary: Gravity surveys are an important method for investigating the Earth's interior. This study presents a novel non-convex framework for gravity inversion and develops an improved optimization algorithm for efficient model reconstruction. The study also reconstructs rocks in the Nanling region of China, providing guidance for further deep resource exploration.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Yunus Levent Ekinci, Caglayan Balkaya, Gokhan Gokturkler, Hanbing Ai
Summary: This study presents a gravity inversion procedure using the success-history-based adaptive differential evolution (SHADE) algorithm to reconstruct the 3-D basement relief geometry in sedimentary basins. The method involves exponential population size reduction and self-adaptive control parameters to solve the highly nonlinear inverse problem. The results demonstrate the power and reliability of the SHADE with EPSR strategy as an alternative inversion tool for highly nonlinear geophysical problems.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
He Tang, Wenke Sun
Summary: Bouguer correction for gravity data of thin-layered materials is extensively researched in geodesy. Different formulas are used for flat earth model, spherical thin layer, and inhomogeneous layers on Earth's surface, with significant influence from the geometric character of the thin layer. Recommendations for the general use of Bouguer correction formulae are given after discussing mathematical relationships and differences in detail.
PURE AND APPLIED GEOPHYSICS
(2021)
Article
Geochemistry & Geophysics
M. Ismaiel, M. Y. Ali, S. Pilia, A. B. Watts, M. P. Searle
Summary: In this study, P-wave receiver functions were used to examine the crustal properties and velocity structure of the United Arab Emirates (UAE)-Oman mountain belt. The results showed that the mountain belt has a thick crust and deeper Moho depth, which can be attributed to crustal thickening and lithospheric flexure during the obduction process. The eastern flank of the mountain belt exhibits higher Vp/Vs ratios and thicker crust, indicating the presence of a thick ophiolite thrust sheet, while the western flank and foreland basin have lower Vp/Vs ratios, suggesting a more felsic/intermediate crustal composition.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
M. Lv, Y. Zhang, S. Liu
Summary: Gravity inversion is a process of obtaining underground anomalies' spatial structure and physical properties using surface collected gravity anomaly data. Recent developments in deep learning have achieved good results for gravity inversion methods based on deep learning. However, using deep learning inversion requires generating a large amount of training data and consumes significant time and storage. To address this, we propose using a neural network to approximate the forward computation and introduce multitask learning to enhance the model's generalization ability.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Yongbo Li, Shi Chen, Honglei Li, Bei Zhang
Summary: In this study, a method for estimating fault parameters and evaluating their uncertainty is proposed using a parametrized 3-D dipping model and Bayesian theory. The effectiveness of the method is validated through synthetic data and practical application, showing its efficiency in revealing 3-D dipping fault parameters and quantifying parameter uncertainty.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Engineering, Geological
Tamer Y. Duman, Tolga Can, Omer Emre, F. Tuba Kadirioglu, Nilay Basarir Basturk, Tugbay Kilic, Selim Arslan, Selim Ozalp, Recai F. Kartal, Dogan Kalafat, Ferdane Karakaya, Tuba Eroglu Azak, Nurcan M. Ozel, Semih Ergintav, Sinan Akkar, Yildiz Altinok, Senem Tekin, Ayhan Cingoz, A. Ihsan Kurt
BULLETIN OF EARTHQUAKE ENGINEERING
(2018)
Article
Geochemistry & Geophysics
Fatih Sevim, Ekrem Zor, Cem Acikgoz, Adil Tarancioglu
JOURNAL OF SEISMOLOGY
(2018)
Article
Engineering, Geological
S. Akkar, T. Azak, T. Can, U. Ceken, M. B. Demircioglu Tumsa, T. Y. Duman, M. Erdik, S. Ergintav, F. T. Kadirioglu, D. Kalafat, O. Kale, R. F. Kartal, K. Kekovali, T. Kilic, S. Ozalp, S. Altuncu Poyraz, K. Sesetyan, S. Tekin, A. Yakut, M. T. Yilmaz, M. S. Yucemen, O. Zulfikar
BULLETIN OF EARTHQUAKE ENGINEERING
(2018)
Article
Geochemistry & Geophysics
Gokhan Aslan, Cecile Lasserre, Ziyadin Cakir, Semih Ergintav, Seda Ozarpaci, Ugur Dogan, Roger Bilham, Francois Renard
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Multidisciplinary Sciences
Dietrich Lange, Heidrun Kopp, Jean-Yves Royer, Pierre Henry, Ziyadin Cakir, Florian Petersen, Pierre Sakic, Valerie Ballu, Joerg Bialas, Mehmet Sinan Ozeren, Semih Ergintav, Louis Geli
NATURE COMMUNICATIONS
(2019)
Article
Geochemistry & Geophysics
A. Ozgun Konca, Sezim Ezgi Guvercin, Seda Ozarpaci, Alpay Ozdemir, Gareth J. Funning, Ugur Dogan, Semih Ergintav, Michael Floyd, Hayrullah Karabulut, Robert Reilinger
GEOPHYSICAL JOURNAL INTERNATIONAL
(2019)
Article
Geochemistry & Geophysics
Selver Senturk, Ziyadin Cakir, Semih Ergintav, Hayrullah Karabulut
JOURNAL OF GEODYNAMICS
(2019)
Article
Geochemistry & Geophysics
Seda Ozarpaci, Ugur Dogan, Semih Ergintav, Ziyadin Cakir, Alpay Ozdemir, Michael Floyd, Robert Reilinger
Summary: The study found that post-seismic afterslip on the fault resulting from the 1999 Izmit Earthquake in Turkey continues for about 20 years, with varying shallow creep observed near the epicenter through high-density GPS observations. The results suggest shallower apparent locking depths and ongoing afterslip at depth on the coseismic fault following the earthquake.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Sezim Ezgi Guvercin, A. Ozgun Konca, Ali Deger Ozbakir, Semih Ergintav, Hayrullah Karabulut
Summary: This study investigates seismic activity along the Antalya slab in the Eastern Mediterranean, revealing active subduction and convergent motion between plates down to a depth of 120 km. The T-axis of intraslab earthquakes displays down-dip extension, indicating the process of negatively buoyant slab subduction.
Article
Geochemistry & Geophysics
A. Ozgun Konca, Hayrullah Karabulut, Sezim Ezgi Guvercin, Figen Eskikoy, Seda Ozarpac, Alpay Ozdemir, Michael Floyd, Semih Ergintav, Ugur Dogan
Summary: This study investigates the seismic characteristics of the Sivrice earthquake along the East Anatolian Fault, revealing the process and mechanism of earthquake rupture through seismic observations and data analysis.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Zeynep Yilmaz, Ali Ozgun Konca, Semih Ergintav
Summary: This study builds a 3-D model of the region, including the basins and the 3-D fault geometry, to study the competing effects of deep basins and the interseismic locking distribution using the observed Global Navigation Satellite System velocities. The study concludes that the basins along the fault localize the interseismic strain, leading to slightly deeper-estimated locking depths.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
R. Jolivet, J. Jara, M. Dalaison, B. Rouet-Leduc, A. Ozdemir, U. Dogan, Z. Cakir, S. Ergintav, P. Dubernet
Summary: Slow, aseismic slip is important in large earthquakes along active faults and controls the amount of strain in the crust for future earthquakes. The factors controlling aseismic versus seismic fault slip include fault zone material properties, pore fluid pressure, and fault plane geometry. This study focuses on the spatial and temporal distribution of aseismic slip along the North Anatolian Fault and provides a description of the kinematics of fault slip using displacement data. The findings show a correlation between aseismic slip at the surface and shallow locking depth, and the occurrence of slow slip events is restricted to a specific section of the fault.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Ersin Buyuk, Ekrem Zor, Abdullah Karaman
TURKISH JOURNAL OF EARTH SCIENCES
(2020)
Article
Engineering, Geological
Mine Betul Demircioglu, Karin Sesetyan, Tamer Y. Duman, Tolga Can, Senem Tekin, Semih Ergintav
BULLETIN OF EARTHQUAKE ENGINEERING
(2018)
Article
Geosciences, Multidisciplinary
Vedat Ediger, Emin Demirbag, Semih Ergintav, Sedat Inan, Ruhi Saatcilar
BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION
(2018)