Lithospheric structure beneath the East China Sea revealed by Rayleigh-wave phase velocities |
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| Institution: | 1. Institute of Earth Sciences, Academia Sinica, 128 Academia Road, Sec. 2, Nangang, Taipei 11529, Taiwan;2. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;1. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Changping, Beijing 102249, China;3. Shenzhen Branch of China National Offshore Oil Corporation Ltd, Guangzhou 510240, China;1. Department of Earth and Environment Science, National Chung-Cheng University, 168 University Road, San-Hsing, Min-Hsiung, Chia-Yi, Taiwan;2. Clay and Interface Mineralogy, RWTH Aachen University, 52056 Aachen, Germany;3. Department of Earth Sciences, Okayama University, Okayama 700-8530, Japan;4. Department of Civil & Architectural Engineering, Shikoku Electric Power Co. Inc, 2-5, Marunouchi, Takamatsu 760-8573, Japan;5. Ehime Branch, Naiba Co. Ltd., 67-2, Doida-cho, Matsuyama 790-0056, Japan;6. Tokyo Branch, Hanshin Consultants Co. Ltd., 4, Kanda-nishifukuda-cho, Chiyoda-ku 101-0037, Japan;1. U.A. Asanaliev Kyrgyz Mining Institute, 215 Chuy Street, Bishkek 720001, Kyrgyzstan;2. A.P. Karpinsky Russian Geological Research Institute (FGUP “VSEGEI”), 74 Sredny Prospect, VSEGEI, St. Petersburg 199106, Russia;1. Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur Campus, Mohanpur 741246, West Bengal, India;2. Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA;1. CSIR-National Geophysical Research Institute, Hyderabad, India;2. Department of Earth and Atmospheric Sciences, NIT, Rourkela, India;3. CWPRS, Khadakwasla, Pune, India |
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| Abstract: | We explore the variations of Rayleigh-wave phase-velocity beneath the East China Sea in a broad period range (5–200 s). Rayleigh-wave dispersion curves are measured by the two-station technique for a total of 373 interstation paths using vertical-component broad-band waveforms at 32 seismic stations around the East China Sea from 6891 global earthquakes.The resulting maps of Rayleigh-wave phase velocity and azimuthal anisotropy provide a high resolution model of the lithospheric mantle beneath the East China Sea. The model exhibits four regions with different isotropic and anisotropic patterns: the Bohai Sea, belonging to the North China Craton, displays a continental signature with fast velocities at short periods; the Yellow Sea, very stable unit associated with low deformation, exhibits fast velocities and limited anisotropy; the southern part of the East China Sea, with high deformation and many fractures and faults, is related to slow velocities and high anisotropic signature; and the Ryukyu Trench shows high-velocity perturbations and slab parallel anisotropy. |
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| Keywords: | Tomography Seismic tomography Surface waves and free oscillations Wave propagation Asia Geodynamics |
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