Article
Geochemistry & Geophysics
Gerardo Leon Soto, Raul W. Valenzuela, R. Arceo, Eduardo Huesca-Perez, Ricardo Vazquez Rosas
Summary: Shear wave splitting measurements in the Isthmus of Tehuantepec show a predominantly trench-normal pattern of fast polarization orientations, suggesting a corner flow in the mantle wedge and an entrained flow in the subslab region. Fast orientations parallel to the Absolute Plate Motion indicate anisotropy driven by asthenospheric flow in that region. Comparison with measurements in the Mexican subduction zone reveals a 17 degrees clockwise rotation of fast orientations between east and west Mexico, consistent with a 19 degrees clockwise rotation observed in the Middle American Trench.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Hannah E. Krueger, Isabella Gama, Karen M. Fischer
Summary: This study aims to constrain the origins of layering in the seismic velocity structure within the cratonic mantle lithosphere. Negative Mid-Lithospheric Discontinuities (MLDs) were found to be common but intermittent, with shear velocity drops of 1%-4%. These negative MLDs are more strongly correlated with tectonic and metasomatic activity long after craton formation, rather than age-related variations in mantle composition.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Ashutosh Shrivastava, Kelly H. Liu, Stephen S. Gao
Summary: The study utilizes P-wave amplitude spectra from teleseismic events recorded by broadband seismic stations to examine seismic attenuation in the crust and upper mantle. Results show a zone of relatively low attenuation in the Gulf of Mexico Coastal Plain and southwestern terminus of the Piedmont province, possibly attributed to remnant lithospheric fragments. The low attenuation anomaly is located in the uppermost mantle and coincides with the Brunswick magnetic anomaly.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
S. Kato, K. Nishida
Summary: This paper proposes a new method for inferring seismic discontinuity structures using body-wave microseisms. By generalizing the receiver function analysis for earthquakes to body-wave microseisms, the study detected the 410- and 660-km mantle discontinuities.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Emily E. Rodriguez, Daniel Evan Portner, Susan L. Beck, Marcelo P. Rocha, Marcelo B. Bianchi, Marcelo Assumpcao, Mario Ruiz, Patricia Alvarado, Cristobal Condori, Colton Lynner
Summary: The Andean Subduction Zone is a long continuous subduction zone on Earth, ideal for studying subduction zone dynamics. Utilizing data from over 1000 seismic stations deployed across South America, a finite-frequency teleseismic S-wave tomography model of the mantle beneath the Andean Subduction Zone related to the Nazca Plate was produced.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Isabella Gama, Karen M. Fischer, Zachary Eilon, Hannah E. Krueger, Colleen A. Dalton, Lucy M. Flesch
Summary: The study utilized Sp receiver functions and Rayleigh wave phase velocities to invert rock velocity profiles of the crust and upper mantle beneath Alaska. Results show that in central Alaska, the continental lithosphere is thinnest and has the lowest velocities, thickening and increasing in velocity towards the north. In the south, the subducting Yakutat plate is thicker than the subducting Pacific plate.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Jie Fan, Xuewei Bao, Bingfeng Zhang
Summary: We constructed a new 3-D shear wave velocity model of the crust and upper mantle beneath SE China and determined crustal thicknesses and Vp/Vs ratios. We found high-velocity anomalies and high Vp/Vs ratios beneath the coastal volcanic-intrusive belt (CVIB), indicating underplating of mafic material. We observed stronger asthenospheric upwelling and partial melting beneath the CVIB, suggesting an increase in intensity of geodynamic processes responsible for the Mesozoic magmatism in SE China.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Brandon Herr, Jonathan Delph
Summary: This study uses seismic data to obtain a 3D discontinuity volume of the lithospheric structure beneath the Hawaiian Islands. The results show a crust-mantle transition at approximately 12 km below the sea level and a high amplitude discontinuity at around 6 km below the Kilauea caldera, representing an olivine-dominated magmatic reservoir.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Brandon P. VanderBeek, Manuele Faccenda
Summary: Despite the established anisotropic nature of Earth's upper mantle, the influence of elastic anisotropy on teleseismic P-wave imaging has been largely ignored. Recent studies have shown the potential of inverting P-wave delay times to determine the strength and orientation of seismic anisotropy, but the ability to constrain complex anisotropic patterns, such as those in subduction settings, remains unclear.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Shangqin Hao, Peter Shearer, Tianze Liu
Summary: By combining data from the EarthScope Transportable Array and other regional seismic networks, we obtained a high-resolution map of the Moho and upper-mantle discontinuities beneath Alaska. The crustal thickness is correlated with elevation and the deepest Moho is found in the basal accretion region of the subducted Yakutat plate. We also resolved the 410, 520, and 660 discontinuities in most regions, indicating the presence of the subducted Pacific slab in the upper mantle transition zone.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Stefan Mroczek, Frederik Tilmann, Jan Pleuger, Xiaohui Yuan, Ben Heit
Summary: To better understand the tectonic structure of the Eastern Alps, a high resolution Moho map was created based on seismic analysis. The map revealed the underthrusting of European crust and a sharp transition to a flat and thinned crust associated with Pannonian extension tectonics. The Adriatic lithosphere also underthrusts northward and becomes steeper towards the Dinarides. The high velocity region in the mantle below the Eastern Alps is likely of European origin.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
F. Salajegheh, J. C. Afonso
Summary: Geoid anomalies provide crucial information about the Earth's internal density structure. Researchers have developed a representative upper mantle geoid model using spherical harmonic analysis, showing significant contributions from degrees 5 and 6.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Nahidul Hoque Samrat, Matt A. King, Christopher Watson, Andrea Hay, Valentina R. Barletta, Andrea Bordoni
Summary: Through GPS observations and digital elevation models, the study demonstrates that the rheology and ice-mass change in the northern Marguerite Bay region of the Antarctic Peninsula are influenced by viscoelasticity, and the non-linear uplift phenomenon can be explained by a layered viscoelastic model.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Dong Yan, You Tian, Zhiqiang Li, Hongli Li
Summary: This study investigated the 3D P-wave velocity structure of the crust and upper mantle beneath the Yarlung-Tsangpo suture using teleseismic tomography. The results revealed alternating low- and high-Vp anomalies beneath the Himalayan and Lhasa blocks across the YTS, indicating strong lateral heterogeneities in the region. Additionally, prominent low-Vp and high-Vp zones were observed beneath the Himalayan and Lhasa blocks respectively, suggesting the presence of rigid lithosphere and potential fragmentation of the underthrusting Indian continental lithosphere.
Article
Geochemistry & Geophysics
Manuel Jose Mojica Boada, Esteban Poveda, Jean Baptiste Tary
Summary: The northwestern corner of South America is a highly complex geodynamic zone, where the convergence of South America, Nazca, and Caribbean plates leads to heterogeneity and complexity in the lithospheric structure. This study presents depth-migrated profiles of teleseismic receiver function analysis, providing better understanding of the lithospheric discontinuities and intracrustal features. The results show an updated crustal thickness map, differences in the northernmost part of the cordilleran system, and support the segmentation of the subduction system with multiple slab segments.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
E. Hopper, K. M. Fischer, S. Rondenay, R. B. Hawman, L. S. Wagner
GEOPHYSICAL RESEARCH LETTERS
(2016)
Article
Geochemistry & Geophysics
Stephane Rondenay, Kathrin Spieker, Lucas Sawade, Felix Halpaap, Mari Farestveit
SEISMOLOGICAL RESEARCH LETTERS
(2017)
Article
Geochemistry & Geophysics
Kathrin Spieker, Stephane Rondenay, Ricardo Ramalho, Christine Thomas, George Helffrich
GEOPHYSICAL JOURNAL INTERNATIONAL
(2018)
Article
Geochemistry & Geophysics
Felix Halpaap, Stephane Rondenay, Lars Ottemoller
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geochemistry & Geophysics
Jean-Arthur Olive, Frederick Pearce, Stephane Rondenay, Mark D. Behn
EARTH AND PLANETARY SCIENCE LETTERS
(2014)
Article
Geochemistry & Geophysics
Alexander Perrin, Saskia Goes, Julie Prytulak, Stephane Rondenay, D. Rhodri Davies
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Multidisciplinary Sciences
R. Shane McGary, Rob L. Evans, Philip E. Wannamaker, Jimmy Elsenbeck, Stephane Rondenay
Article
Geochemistry & Geophysics
Christian Schiffer, Tuna Eken, Stephane Rondenay, Tuncay Taymaz
GEOPHYSICAL JOURNAL INTERNATIONAL
(2019)
Article
Geosciences, Multidisciplinary
Michael Everett Mann, Geoffrey A. Abers, Kayla Crosbie, Kenneth Creager, Carl Ulberg, Seth Moran, Stephane Rondenay
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Multidisciplinary Sciences
Felix Halpaap, Stephane Rondenay, Alexander Perrin, Saskia Goes, Lars Ottemoller, Hakon Austrheim, Robert Shaw, Thomas Eeken
Article
Geochemistry & Geophysics
Hongliang Wang, Ritske S. Huismans, Stephane Rondenay
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
C. S. Ogden, I. D. Bastow, A. Gilligan, S. Rondenay
GEOPHYSICAL JOURNAL INTERNATIONAL
(2019)
Article
Geochemistry & Geophysics
F. Millet, T. Bodin, S. Rondenay
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
Alistair Boyce, Ian D. Bastow, Eva M. Golos, Stephane Rondenay, Scott Burdick, Robert D. Van der Hilst
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
Alistair Boyce, Ian D. Bastow, Stephane Rondenay, Robert D. Van der Hilst
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2017)