Article
Multidisciplinary Sciences
Chao Liu, Takashi Yoshino, Daisuke Yamazaki, Noriyoshi Tsujino, Hitoshi Gomi, Moe Sakurai, Youyue Zhang, Ran Wang, Longli Guan, Kayan Lau, Yoshinori Tange, Yuji Higo
Summary: This study investigates the effect of water on the seismic properties of olivine aggregates in the oceanic lithosphere. The results show that water substantially enhances energy dispersion and reduces elastic moduli, with an attenuation peak at higher frequencies. The findings suggest that the sharp seismic changes at the lithosphere-asthenosphere boundary far from mid-ocean ridges could be attributed to the difference in water content between the lithosphere and asthenosphere.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Geochemistry & Geophysics
Yuto Sato, Eiichi Takahashi, Chang-Ming Xing, Li Li, Ze-Xian Cui, Wan-Feng Zhang, Xiao-Ping Xia
Summary: This study presents the depth profile of water content in the mantle, including the lithosphere-asthenosphere boundary (LAB), based on the analysis of peridotite xenoliths from Northeast Japan. The results show that there is no water content contrast across the LAB, supporting the "partial-melting model" for its origin.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
S. Salimbeni, S. Pondrelli, I. Molinari, J. Stipcevic, S. Prevolnik, I. Dasovic
Summary: This study investigates the structure of the Adria microplate and its possible mantle circulation and slab windows by analyzing seismic data. The results show that the presence of slab windows in the Apennines and Dinarides slabs is consistent with previous measurements, while the mantle pattern in the Apulia region is unaffected by slab retreat.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
James A. N. Hazzard, Fred D. Richards, Saskia D. B. Goes, Gareth G. Roberts
Summary: Uncertainty in present-day glacial isostatic adjustment (GIA) rates represents a significant portion of the total ice mass balance signal over Antarctica. Physical couplings between solid Earth, sea level, and ice dynamics further enhance the dependence of the GIA signal on mantle rheology variations. This study presents a Bayesian inverse method that maps shear-wave velocities into thermomechanical structure, improving estimates of ice mass balance and providing insights into the dynamic response of West Antarctica to ice loss.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
A. P. Singh, Niraj Kumar, B. Nageswara Rao, V. M. Tiwari
Summary: The growth of the eastern Indian shield is closely related to thermo-chemical processes, with significant variations in lithospheric density and thickness across the region. The moderate crustal density difference and almost smooth crust-mantle boundary at 37-40 km depth suggest substantial mafic-ultramafic crustal intrusions in the area.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Tianze Liu, Peter M. Shearer
Summary: A new method using S-reflections generated by teleseismic S waves is proposed to image lithospheric discontinuities, providing high-resolution images of LAB and MLD below the contiguous US. The results show reasonable agreement with traditional techniques, suggesting the possibility of joint inversion for better constraint of lithospheric discontinuity properties.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Fanchang Meng, Yinshuang Ai, Tao Xu, Ling Chen, Xin Wang, Long Li
Summary: The study investigated the spatial variations in the depths of the lithosphere-asthenosphere boundary (LAB) and mid-lithosphere discontinuity (MLD) in the boundary region of the North China Craton (NCC) and Xing-Meng Orogenic Belt (XMOB). The results revealed complex lithospheric deformation and thinning, possibly related to partial melting induced by the subducting Paleo-Pacific plate and its stagnation during the Late Mesozoic.
Review
Astronomy & Astrophysics
Masaki Yoshida, Kazunori Yoshizawa
Summary: The influence of the continental lithosphere and its root on the continental drift is crucial in plate tectonics history, with stability determined by the viscosity contrast between the continental lithosphere and the underlying mantle. Orogenic belts or suture zones surrounding cratons act as a buffer to protect cratons and ensure longevity. The presence of low-viscosity asthenosphere reduces basal drag force, contributing to the stability and longevity of the cratonic lithosphere.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 49, 2021
(2021)
Article
Geosciences, Multidisciplinary
Yang He, Qi-Fu Chen, Ling Chen, Xin Wang, Guangrui Guo, Tianjue Li, Kaiwen Zhang, Juan Li, Yun Chen
Summary: The lithospheric structure of the Xing'an-Mongolian Orogenic Belt (XMOB) was investigated using receiver function imaging and shear wave splitting analysis. The results reveal a coherent lithosphere-asthenosphere boundary (LAB) across different tectonic blocks. A mid-lithospheric discontinuity was also identified beneath the western side of the North-South Gravity Lineament (NSGL), roughly at the same depth as the LAB beneath the eastern side of NSGL. The distinct variations in lithospheric structure and shear-wave polarization direction across the NSGL suggest different tectonic processes on the two sides, possibly indicating the influence of subduction of the (Paleo-)Pacific Plate on the western boundary. Lithosphere thinning in the XMOB is mainly limited to the eastern side of the NSGL.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geology
C. M. Cooper, R. J. Farrington, M. S. Miller
Summary: The study suggests that subducting slabs might cause lithospheric removal by directing mantle flow, impacting the overall stability of the lithosphere; simulations show that cratonic shape influences channelization of flow and resistance to deformation.
Article
Geochemistry & Geophysics
Marija Putak Juricek, Hans Keppler
Summary: The stability of amphibole is affected by water fugacity, with decreasing water activity leading to a displacement of the stability field to lower pressures and higher temperatures. It is found that amphibole may form in a narrow pressure range along an oceanic geotherm for mantle containing 150-200 ppm water, contributing significantly to water storage. However, amphibole cannot account for the lithosphere-asthenosphere boundary due to its decomposition through a solid-state reaction for realistic mantle water contents.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Vera Schulte-Pelkum, Thorsten W. Becker, Whitney M. Behr, Meghan S. Miller
Summary: By analyzing deformation indicators at different depths in southern California, it was found that there is roughly N-S compression and E-W extension near the surface and in the asthenospheric mantle. However, all lithospheric anisotropy indicators show deviations, indicating that lithospheric structure may influence current deformation behavior.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Daniel Possee, Catherine Rychert, Nicholas Harmon, Derek Keir
Summary: The study using S-to-P receiver functions reveals the seismic structure of the mantle across the boundary of the Caribbean plate, highlighting different velocity changes associated with subduction and collision. It provides detailed descriptions of crustal and lithospheric thicknesses as well as deep mantle structures.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Sambuddha Mukherjee, Labani Ray, Satish Maurya, Shalivahan, Prakash Kumar
Summary: This study investigates the lithospheric structure beneath the Eastern Dharwar Craton (EDC) using geochemical, thermal, and seismological data sets. The measurements suggest a thick lithosphere with a sharp transition across the lithosphere-asthenosphere boundary (LAB). The presence of younger rock samples supports the hypothesis that the lithosphere has been thinned by a plume during the Gondwanaland breakup.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
C. Haeger, A. G. Petrunin, M. K. Kaban
Summary: High-quality maps of Geothermal heat flow are crucial for modeling ice dynamics and mass loss of the Antarctic Ice Sheet. Determining Geothermal heat flow is challenging, and we have developed a new method to estimate it and created a new map. The map shows the correlation between surface heat flow and subglacial volcanism.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Jannes Munchmeyer, Jack Woollam, Andreas Rietbrock, Frederik Tilmann, Dietrich Lange, Thomas Bornstein, Tobias Diehl, Carlo Giunchi, Florian Haslinger, Dario Jozinovic, Alberto Michelini, Joachim Saul, Hugo Soto
Summary: Deep learning models, such as EQTransformer, GPD, and PhaseNet, have shown the best performance in seismic event detection and phase picking. The study also reveals that models can be effectively transferred across regions with similar distances. The results and trained models are made accessible to end-users through the SeisBench framework for easy application.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
T. Ryberg, W. H. Geissler, W. Jokat, X. Yuan, T. Fromm, S. Pandey, B. Heit
Summary: The Walvis Ridge is a prominent hotspot track related to the opening of the South Atlantic Ocean. Through seismic experiments and tomography, the study investigates the crustal structure modified by the Tristan hotspot in the landward prolongation of the ridge and in adjacent oceanic basins. The results reveal the structural features of the crust in these areas.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Youqiang Yu, Frederik Tilmann, Dapeng Zhao, Stephen S. Gao, Kelly H. Liu
Summary: This study reveals that the Woodlark rift follows a passive model and is mainly driven by slab pull.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Jack Woollam, Jannes Muenchmeyer, Frederik Tilmann, Andreas Rietbrock, Dietrich Lange, Thomas Bornstein, Tobias Diehl, Carlo Giunchi, Florian Haslinger, Dario Jozinovi, Alberto Michelini, Joachim Saul, Hugo Soto
Summary: Machine-learning methods have been widely used in seismology, but the current process of accessing benchmark datasets and models is time-consuming, which hinders the further development of machine learning techniques. To address this issue, we introduce SeisBench, an open-source framework that standardizes access to models and datasets and provides common processing and data augmentation operations. With SeisBench, seismologists can easily access various machine learning models and benchmark datasets.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Antje Schloemer, Joachim Wassermann, Wolfgang Friederich, Michael Korn, Thomas Meier, Georg Ruempker, Christine Thomas, Frederik Tilmann, Joachim Ritter
Summary: The German Seismological Broadband Array (DSEBRA) is a network of 100 mobile seismological stations that can operate independently or in conjunction with other stations. The network's first mission was part of the European AlpArray initiative, with the aim of studying seismic activity in the Alps??? Apennines???Carpathians???Dinarides orogenic system. The current deployment of DSEBRA stations covers the Alpine region of Germany, Austria, and Italy, as well as the Pannonian basins of Hungary. Equipped with state-of-the-art technology, these stations provide high-quality real-time seismic data.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Philippe Jousset, Gilda Currenti, Benjamin Schwarz, Athena Chalari, Frederik Tilmann, Thomas Reinsch, Luciano Zuccarello, Eugenio Privitera, Charlotte M. Krawczyk
Summary: Understanding physical processes prior to and during volcanic eruptions has improved significantly in recent years, but uncertainties about subsurface structures and undetected processes within the volcano prevent volcanologists from inferring subtle triggering mechanisms of volcanic phenomena. This article demonstrates that distributed acoustic sensing (DAS) with optical fibers allows for remote identification of volcanic events and imaging of hidden near-surface volcanic structural features, providing the basis for improved volcano monitoring and hazard assessment.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Wasja Bloch, Sabrina Metzger, Bernd Schurr, Xiaohui Yuan, Lothar Ratschbacher, Sanaa Reuter, Qiang Xu, Junmeng Zhao, Shokhruhk Murodkulov, Ilhomjon Oimuhammadzoda
Summary: A sequence of strong earthquakes (M(W) 7.2, 6.4, 6.6) occurred in the Pamir of Central Asia from 2015 to 2017. These earthquakes provided unprecedented detail about the tectonic structures in the Pamir region, including thrusts, strike-slip faults, and normal faults. The aftershock triggering occurred on favorably oriented faults within a distance of <= 90 km.
GEOPHYSICAL JOURNAL INTERNATIONAL
(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
Peter Makus, Christoph Sens-Schoenfelder, Luc Illien, Thomas R. Walter, Alexander Yates, Frederik Tilmann
Summary: This study analyzes seismic data from the Klyuchevskoy Volcanic Group in Russia to study signals related to volcanic activity. A new technique called time-segmented passive image interferometry is proposed to detect volcanic inflation and deflation. The results show that rainfall and snowfall have the strongest influence on the properties of rocks, and an eruption cycle in 2016 is associated with a significant increase in velocity.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Constanza Rodriguez Piceda, Ya-Jian Gao, Mauro Cacace, Magdalena Scheck-Wenderoth, Judith Bott, Manfred Strecker, Frederik Tilmann
Summary: Knowledge of the causative dynamics of earthquakes along subduction-zone interfaces and within oceanic slabs is important for seismic hazard assessments. This study combines seismic tomography, 3D structure analysis, and seismicity to investigate the factors controlling slab seismic activity beneath the southern Central Andes. The hydration state of the lithospheric mantle, oceanic slab, and plate interface can be evaluated using the Vp/Vs ratio. Regions of high Vp/Vs are caused by compaction effects and dehydration reactions, while areas of low Vp/Vs and inferred lower fluid content in the overriding plate are facilitated by enhanced flexural stresses.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Rainer Kind, Stefan M. Schmid, Felix Schneider, Thomas Meier, Xiaohui Yuan, Ben Heit, Christian Schiffer, AlpArray Working Grp, SWATH D Working Grp
Summary: By studying the seismic waves and using the conversion, the structure of the European lithosphere and the lithosphere-asthenosphere boundary (LAB) has been investigated. It was found that the thickness of the European mantle lithosphere increases from the north towards the Alps, and the crust in the Alpine region has been deformed by the Alpine collision.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Diego Gonzalez-Vidal, Marcos Moreno, Christian Sippl, Juan Carlos Baez, Francisco Ortega-Culaciati, Dietrich Lange, Frederik Tilmann, Anne Socquet, Jan Bolte, Joaquin Hormazabal, Mickael Langlais, Catalina Morales-Yanez, Daniel Melnick, Roberto Benavente, Jannes Muenchmeyer, Rodolfo Araya, Benjamin Heit
Summary: We deployed a dense network in the seismic gap in Chile and obtained a microseismicity catalog of >30,000 events and time series from GNSS stations. We used Bayesian inversion to estimate interplate locking and found two highly locked regions of different sizes controlling seismicity patterns. The region with lower locking coincides with higher seismicity levels and events extending toward the trench.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Yijun Zhang, Xiongwei Tang, Dechuan Liu, Tuncay Taymaz, Tuna Eken, Rumeng Guo, Yong Zheng, Jingqi Wang, Heping Sun
Summary: This study investigates the influence of fault geometry on the kinematics and slip distribution of the Kahramanmaras earthquake doublet in southeastern Turkey using synthetic aperture radar observations and high-frequency teleseismic array waveforms. The results suggest that geometric barriers can affect the propagation speed of rupture and enhance high-frequency wave radiations.
Article
Environmental Sciences
Patrick A. Hoyer, Karsten M. Haase, Marcel Regelous, John M. O'Connor, Stephan Homrighausen, Wolfram H. Geissler, Wilfried Jokat
Summary: The Rio Grande Rise in the South Atlantic Ocean is an oceanic plateau formed by mantle plume and rift-related volcanism, without a continental crust component.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)