Article
Geochemistry & Geophysics
Andrew Birkey, Heather A. Ford, Page Dabney, Gillian Goldhagen
Summary: Studies have found complex layering within the mantle lithosphere of Australia, with the lithosphere-asthenosphere boundary observed in the east but not in the cratonic core. Ambiguous phases were noted at stations in the western margin, indicating potential midlithospheric discontinuities or LAB. Multiple negative phases suggest a heterogeneous lithosphere.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Chen Zhang, Zhen Guo, Yong Yu, Ting Yang, Yongshun John Chen
Summary: In this study, we used P and S receiver functions to obtain the crustal and lithospheric structures of the Ordos block in the western North China Craton. The results show that the Ordos block has a thick lithosphere, while the lithosphere is significantly thinner in its surrounding rift systems. Furthermore, the northern margin of the Ordos block is heavily modified by mantle upwelling, whereas the southern margin has little modification from eastward lateral asthenospheric flow.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Daniel Kalmar, Laura Petrescu, Josip Stipcevic, Attila Balazs, Istvan Janos Kovacs
Summary: By analyzing seismic data from the Pannonian region, this study shows that the lithosphere-asthenosphere boundary is relatively shallow in the basin system and deeper in the surrounding orogens. The research also provides new insights into the lithospheric thickness and seismic properties in the eastern part of the study region.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(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
Zhou Zhang, Yangfan Deng
Summary: This study proposes a new strategy called GC_SRF, which utilizes grid search and correlation analysis to obtain reliable SRFs for estimating lithospheric thickness. Extensive testing using synthetic and real data confirms the robustness and reproducibility of the GC_SRF strategy. The results also reveal lateral variations of lithospheric thickness in southeastern Tibet.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Lin Liu, Simon L. Klemperer, Alexander R. Blanchette
Summary: The study investigates the Moho, MLD, and LAB from southern Africa to northern Arabia at 1-degree resolution using a new SRF database. The results show good agreement between SRFs and PRFs, suggesting robust deeper lithospheric discontinuity imaging. The NVG depth represents earth structure, with variations suggesting different lithospheric compositions and ages.
Article
Geosciences, Multidisciplinary
Haixiang Zhao, Pan Wang, Zhouchuan Huang
Summary: The Mongolian Plateau in the western segment of the Central Asian Orogenic Belt was affected by the India-Asian collision, resulting in the formation of the Hangay Dome. Research findings suggest that the lithosphere-asthenosphere boundary is shallower beneath the western Mongolian Plateau compared to the North China Craton and Siberian Craton, with a possible deeper boundary beneath the Hangay Dome indicating lithospheric delamination. This led to the conclusion that the tectonic uplift of the Hangay Dome was caused by consequential asthenospheric upwelling.
JOURNAL OF ASIAN EARTH SCIENCES
(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
Arushi Saxena, Charles Adam Langston
Summary: Identifying upper-mantle discontinuities in the Central and Eastern US is crucial for verifying models of lithospheric thinning and a low-velocity anomaly structure beneath the Mississippi Embayment. The study used S-wave receiver functions to detect lithospheric boundaries in the embayment region and revealed a mid-lithospheric discontinuity (MLD) corresponding to a negative velocity contrast. Quantitative analysis attributed this observed MLD to a combination of temperature, water content, and melt content variations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Arushi Saxena, Charles Adam Langston
Summary: This study used S-wave receiver functions to detect lithospheric boundaries in the Mississippi Embayment region, identifying a mid-lithospheric discontinuity at depths between 50 and 100 km. The origin of this discontinuity was attributed to a combination of temperature, water content, and melt content variations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Weilai Wang, Guangyao Cai, Jianping Wu, Lihua Fang
Summary: The distribution of lithosphere and asthenosphere in the study area was investigated through joint inversion of receiver functions and surface waves. The results showed the presence of low-velocity bodies in the lower crust of the Qinling tectonic belt, but they were not connected and may not serve as a channel for material extrusion from the NE Tibetan Plateau. The lithosphere beneath the Sichuan Basin and Ordos Basin was relatively thick, while it was severely destructed and restructured in the east of the study area. The asthenosphere beneath the Qinling tectonic belt was observed to have material movement in an approximate east-west direction, indicating its potential role as an important channel for material extrusion in the NE Tibetan Plateau.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Ana M. Nemocon, Jordi Julia, Xavier Garcia
Summary: The crust is typically 34-38 km thick under the western Province and 43-46 km thick under the northern craton. No apparent crustal thinning is observed under the Araripe Basin, due to the presence of a relatively thick lowermost crust. Our findings also suggest the presence of a mid-lithospheric discontinuity and lithosphere-asthenosphere boundary under the Araripe Basin.
Article
Geosciences, Multidisciplinary
Hamdi Alkan, Hakan Cinar
Summary: This study investigates the lithospheric structure beneath the Circum Black Sea using teleseismic receiver functions and Rayleigh wave phase velocity analyses. The results suggest a continental lithosphere structure with a relatively stable Moho depth along both coastlines. The lithosphere-asthenosphere boundary varies in depth and slope across the region, indicating tectonic differences between the eastern and western parts of the Black Sea.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Lipeng He, Xinlei Sun, Pengfei Li, Sanxi Ai, Jianming Li
Summary: The study constructs a high-resolution 3D lithospheric S wave velocity model of the Jiuyishan region using joint inversion of receiver function and ambient noise data. The model reveals thick crust beneath the Yangtze block and thin crust beneath the Cathaysia block, with a complex boundary between the two blocks showing low-velocity anomalies in the middle crust and upper mantle, indicating asthenospheric upwellings.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Xiaoran Chen, Jeffrey Park, Vadim Levin
Summary: The study uses an updated computer algorithm to examine seismic plane-wave propagation in horizontally stratified anisotropic media. The ANIMATIVITY software is able to simulate wave propagation with high frequency components and compute all transmission and reflection coefficients. Validation with synthetic receiver functions shows that features in gradual-transition models could be mistaken for dipping interfaces.
PURE AND APPLIED GEOPHYSICS
(2021)
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
Geosciences, Multidisciplinary
Yunhao Wei, Rizheng He, Xiaohui Yuan, Wei Li, Zhanbo Ji, Xiao Niu, Zongxu Li
Summary: Research findings show that the crust in the Hoh Xil Basin has thickened to over 70 km, thicker than the plateau crust, suggesting that the plateau crust may have injected northward in the Late Paleogene, leading to the uplift of the basin.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jose Morales, Antonio Molina-Aguilera, Flor de Lis Mancilla, Daniel Stich, Jose Miguel Azanon, Teresa Teixido, Jose Angel Lopez-Comino, Benjamin Heit, Xiaohui Yuan, Antonio Miguel Posadas
Summary: P-wave receiver functions obtained from teleseismic earthquake recordings provide a detailed view of the crustal structure of the Betic mountain range in southeastern Spain. The presence of the subducted Iberian paleomargin and its impact on the crustal thinning and downward bending of the Variscan crust beneath the Betics are revealed. The migrated section suggests that material from the subduction channel has been integrated into the Betic orogen, supporting the origin of the HP-LT Nevado-Filabride units from subducted Variscan crust.
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)