Structure and Dynamics of Lithosphere and Asthenosphere in Asia: A Seismological Perspective
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Published:2023-04-06
Issue:7
Volume:50
Page:
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ISSN:0094-8276
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Container-title:Geophysical Research Letters
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language:en
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Short-container-title:Geophysical Research Letters
Author:
Ma Jincheng1ORCID,
Bunge Hans‐Peter1ORCID,
Fichtner Andreas2ORCID,
Chang Sung‐Joon3ORCID,
Tian You4
Affiliation:
1. Department of Earth and Environmental Sciences Ludwig‐Maximilians‐Universität München Munich Germany
2. Department of Earth Sciences ETH Zürich Zurich Switzerland
3. Department of Geophysics Kangwon National University Chuncheon South Korea
4. College of Geoexploration Science and Technology Jilin University Changchun China
Abstract
AbstractKnowledge of lithospheric structure is essential for understanding the impact of continental collision and oceanic subduction on surface tectonic configurations. Full‐waveform tomographic images reveal lateral heterogeneities and anisotropy of the lithosphere and asthenosphere in Asia. Estimating lithospheric thickness from seismic velocity reductions at depth exhibits large variations underneath different tectonic units. The thickest cratonic roots are present beneath the Sichuan, Ordos, and Tarim basins and central India. Radial anisotropy signatures of 11 representative tectonic provinces uncover the different nature and geodynamic processes of their respective past and present deformation. The large‐scale continental lithospheric deformation is characterized by low‐velocity anomalies from the Himalayan Orogen to the Baikal rift zone in central Asia, coupled with the post‐collision thickening of the crust. The horizontal low‐velocity layer of ∼100–300 km depth extent below the lithosphere points toward the existence of the asthenosphere beneath East and Southeast Asia, with heterogeneous anisotropy indicative of channel flows.
Funder
China Scholarship Council
National Natural Science Foundation of China
Korea Meteorological Administration
National Research Foundation of Korea
Publisher
American Geophysical Union (AGU)
Subject
General Earth and Planetary Sciences,Geophysics
Cited by
1 articles.
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1. Seismic Thermography;Bulletin of the Seismological Society of America;2024-01-26