Article
Geochemistry & Geophysics
Jeremy M. Gosselin, Pascal Audet, Andrew J. Schaeffer, Fiona A. Darbyshire, Clement Esteve
Summary: Surface wave tomography is a valuable tool for constraining azimuthal anisotropy at regional scales, but the sparse and uneven coverage of dispersion measurements pose challenges in uncertainty estimation. A Bayesian trans-dimensional inversion approach is used in this paper to better model azimuthal anisotropy using surface wave dispersion data, with a focus on considering data errors and avoiding subjective model regularization. The results provide insights into the structural context of tectonic dynamics in northern Cascadia and Haida Gwaii, highlighting the importance of considering azimuthal anisotropy in tomographic inversions for understanding seismic and tsunami hazards.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yingwei Yan, Xiaofei Chen, Nan Huai, Jianbo Guan
Summary: This paper introduces a staging strategy for the inversion of multimodal surface wave dispersion curves and proposes an inversion method based on pattern search and Kuhn-Munkres algorithm. Synthetic reconstruction tests confirm the effectiveness of this method and it is further validated through the analysis of actual data sets.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Mohsen Kazemnia Kakhki, Ahmadreza Mokhtari, Webe Joao Mansur, Vincenzo Del Gaudio
Summary: In this paper, a novel time-frequency polarization filter based on three-component sparse adaptive S transform (3C-SAST) is proposed, which demonstrates high efficiency and flexibility in seismic surface wave separation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
L. A. Ermert, K. Sager, T. Nissen-Meyer, A. Fichtner
Summary: The method developed in the study effectively constrained the global source distribution of the Earth's hum, with dominant sources in the Southern Hemisphere during winter and exceptions in the Izu-Bonin-Mariana arc. Strong hum sources were found to be associated with coastlines or bathymetric highs. The practical feasibility of frequency-dependent noise source inversion was demonstrated, potentially improving full-waveform ambient noise inversions and enhancing our understanding of noise generation physics.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Lingli Gao, Yudi Pan, Andreas Rieder, Thomas Bohlen, Weijian Mao
Summary: Full-waveform inversion (FWI) has been proven to be effective for high-resolution imaging of the shallow subsurface. In this study, the advantages of Gauss-Newton (GN) viscoelastic FWI over conventional FWI with a conjugate gradient optimization method are demonstrated using synthetic examples. The potential of 2-D viscoelastic FWI for high-resolution hydrogeological characterization is also investigated.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Lingli Gao, Yudi Pan, Andreas Rieder, Thomas Bohlen
Summary: The study applies a pre-conditioned truncated Newton (PTN) method to shallow-seismic FWI for simultaneous inversion of multiparameter near-surface models. Evaluation of scattered wavefields caused by different parameters and the performance of the PTN method in Rayleigh wave FWI demonstrate its effectiveness in mitigating cross-talk and improving resolution, especially for weak parameters like attenuation and density.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Jeremy M. Gosselin, Pascal Audet, Clement Esteve, Andrew J. Schaeffer
Summary: This work explores the use of a von Mises distribution to represent errors on circular seismological observations, and automates the estimation of surface-wave phase-velocity dispersion for the teleseismic two-station method. Bayesian inverse techniques are applied to measurements of surface-wave phase spectra to estimate 1-D, path-averaged Earth structure, providing additional results of the inversion and confidence in the approach.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Fabrizio Magrini, Sebastian Lauro, Emanuel Kastle, Lapo Boschi
Summary: In order to enhance our understanding of the structure of the Earth's interior, seismologists utilize large amounts of data and automated tools for analysis. This study introduces SeisLib, an open-source Python package for multiscale seismic imaging. The functionalities of SeisLib, which include surface-wave tomography based on seismic ambient noise and teleseismic earthquakes, are demonstrated through theoretical explanations, algorithms, and applications to seismic data from North America. The results highlight the robustness and computational efficiency of SeisLib.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Franck Latallerie, Christophe Zaroli, Sophie Lambotte, Alessia Maggi
Summary: The article describes the process of building a range of models of Rayleigh-wave velocities in the Pacific upper mantle using the SOLA method, and demonstrates how to analyze the models using resolution and uncertainties. The study identifies a slow-velocity anomaly northeast of Hawaii and a pattern of alternatively slow- and fast-velocity bands between 200 and 300 km depth.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Hadrien Michel, Thomas Hermans, Frederic Nguyen
Summary: This paper presents a new method for solving geophysical problems, which combines iterative prior resampling and rejection sampling to improve the accuracy of subsurface imaging and reduce the problem of overestimating the uncertainty range caused by prior uncertainty.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Tan Qin, Thomas Bohlen, Yudi Pan
Summary: This paper presents a new method of petrophysical inversion combining seismic and GPR wavefields, called indirect JPI. By first updating seismic and GPR parameters using non-petrophysical parametrizations and then transforming them to petrophysical parameters, this method can provide more accurate and consistent results than conventional methods, and is more robust in the presence of uncertainties in petrophysical prior knowledge.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Pingping Wu, Handong Tan, Zhifeng Ding, Wenxin Kong, Miao Peng, Xingchen Wang, Lehong Xu
Summary: The integrating technique of multigeophysical data sets has been utilized to improve the imaging resolution of the subsurface structure. Through joint inversion of Magnetotelluric (MT) and dispersion data, significant improvements in resolution and accuracy have been achieved. This method has been validated through synthetic and field data tests.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Favio Cruz-Hernandez, Luis A. Gallardo, Marco Calo, Raul R. Castro, Jose M. Romo-Jones
Summary: In this paper, a two-stage technique for surface wave inversion is proposed to estimate the 3-D distribution of S-wave velocity based on the cross-correlation of ambient seismic noise. The methodology is validated using a synthetic model and shows improved estimation compared to conventional point-wise inversion.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Giulio Vignoli, Julien Guillemoteau, Jeniffer Barreto, Matteo Rossi
Summary: The analysis of surface wave dispersion curves is crucial for inferring the vertical distribution of shear wave velocity, with discussions on regularization strategies and the effectiveness of sparse reconstructions. The estimation of the depth of investigation using sensitivity kernels and the reliability of this estimation are also discussed in the presence of sharp boundaries.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Kai Zhang, Hongyi Li, Kai Wang, Min Liu, Wei Cai, Dongming Liu
Summary: The complexity of surface wave phase velocity spectra may make it difficult to identify mode numbers due to shear wave velocity inversions or strong shear wave velocity contrasts in near-surface structures. The determinant misfit function has been used to invert multimodal dispersion curves without the root-seeking procedure, but it increases model ambiguity due to its complicated relation with modal parameters. This study proposes a multimodal optimization algorithm using a niching particle swarm optimization to find multiple minima and cluster analysis to distinguish different clusters in the inverted solutions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Archaeology
Peter Fischer, Tina Wunderlich, Wolfgang Rabbel, Andreas Voett, Timo Willershaeuser, Kalliopi Baika, Diamanto Rigakou, Garyfalia Metallinou
ARCHAEOLOGICAL PROSPECTION
(2016)
Article
Geochemistry & Geophysics
Sungchan Choi, In-Chang Ryu, H. -J. Gotze, Y. Chae
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geochemistry & Geophysics
J. Autin, M. Scheck-Wenderoth, H. -J. Goetze, C. Reichert, D. Marchal
Article
Geosciences, Multidisciplinary
Jaroslava Panisova, Attila Balazs, Zsfia Zalai, Miroslav Bielik, Ferenc Horvath, Szabolcs Harangi, Sabine Schmidt, Hans-Juergen Goetze
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2018)
Review
Geosciences, Multidisciplinary
Hans-Juergen Goetze, Roland Pail
Article
Geochemistry & Geophysics
Mohamed Sobh, Joerg Ebbing, Ahmed Hamdi Mansi, Hans-Juergen Goetze
Article
Geochemistry & Geophysics
N. Holzrichter, W. Szwillus, H. -J. Goetze
GEOPHYSICAL JOURNAL INTERNATIONAL
(2019)
Article
Geochemistry & Geophysics
M. Sobh, J. Ebbing, A. H. Mansi, H. -J. Goetze, E. L. Emry, M. G. Abdelsalam
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
M. Sobh, C. Gerhards, I Fadel, H-J Goetze
Summary: Surface heat flow and Curie depth in southern Africa provide crucial information on the thermal and compositional structure of the lithosphere. Magnetic anomaly data can be used to estimate Curie depth, which offers insights into the thermal structure of the crust. Comparison with Moho depth models suggests that Curie depth estimates may reflect compositional rather than temperature-controlled constraints in certain regions.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Archaeology
R. Pasteka, P. Zahorec, J. Papc, J. Mrlina, H. -j. Gotze, S. Schmidt
Summary: This study investigates the use of highly accurate microgravimetric measurements to map the recently discovered muon chamber in the Great Pyramid of Giza. By using modern gravimeters and realistic model calculations, researchers aim to understand the composition and structure of the pyramid chamber.
JOURNAL OF ARCHAEOLOGICAL SCIENCE-REPORTS
(2022)
Article
Geosciences, Multidisciplinary
Ajay Kumar, Mauro Cacace, Magdalena Scheck-Wenderoth, Hans-Juergen Goetze, Boris J. P. Kaus
Summary: The dynamics of the Alps and surrounding regions remain not fully understood due to the non-unique interpretation of its upper-mantle architecture. By clustering available shear-wave tomography models, three end-member scenarios of lithospheric thickness and slab geometries were derived and used as input for geodynamic simulations, revealing a potential explanation for observed seismicity.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Pavol Zahorec, Juraj Papco, Roman Pasteka, Miroslav Bielik, Sylvain Bonvalot, Carla Braitenberg, Joerg Ebbing, Gerald Gabriel, Andrej Gosar, Adam Grand, Hans-Juergen Goetze, Gyorgy Hetenyi, Nils Holzrichter, Edi Kissling, Urs Marti, Bruno Meurers, Jan Mrlina, Ema Nogova, Alberto Pastorutti, Corinne Salaun, Matteo Scarponi, Josef Sebera, Lucia Seoane, Peter Skiba, Eszter Szucs, Matej Varga
Summary: The AlpArray Gravity Research Group focuses on compiling a homogeneous gravity data set in the Alpine region, with contributions from European countries and shipborne data. Their recalculated gravity data can be used for geological studies, mineral exploration, and more.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Geochemistry & Geophysics
Cameron Spooner, Magdalena Scheck-Wenderoth, Hans-Juergen Goetze, Jorg Ebbing, Gyoergy Hetenyi
Article
Energy & Fuels
H. -J Goetze, S. Schmidt, P. Menzel
OIL GAS-EUROPEAN MAGAZINE
(2017)
Article
Geosciences, Multidisciplinary
Jan Sefara, Miroslav Bielik, Jozef Vozar, Martin Katona, Viktoria Szalaiova, Anna Vozarova, Barbora Simonova, Jaroslava Panisova, Sabine Schmidt, Hans-Juergen Goetze
GEOLOGICA CARPATHICA
(2017)