Crust and upper mantle structure of East Asia from ambient noise and earthquake surface wave tomography |
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| Authors: | Mengkui Li Xiaodong Song Jiangtao Li Xuewei Bao |
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| Affiliation: | 1.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China2.Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Beijing 100871, China3.School of Earth and Space Sciences, Peking University, Beijing 100871, China4.School of Earth Sciences, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | The complex tectonic background of East Asia makes it an ideal region for investigating the evolution of the continental lithosphere, for which high-resolution lithospheric structural models are essential. In this study, we measured Rayleigh-wave phase-velocity dispersion curves at periods of 10–120 s and group velocity dispersion curves at periods of 10–140 s using event records from more than 1,000 seismic stations in and around China. By jointly inverting new and previously published dispersion data from ambient noise and earthquakes, we developed a high-resolution shear-wave velocity model down to a depth of ～300 km beneath East Asia. Our model revealed heterogeneous lithospheric structures beneath East Asia, and allowed us to investigate the velocity structure of the entire lithosphere. We also derived crustal and lithospheric thickness models from the three-dimensional (3D) shear-wave model, revealing strong spatial heterogeneity and a general thinning trend of lithospheric thickness from west to east across the study region. Overall, our models reveal important lithospheric features beneath East Asia and provide a valuable baseline dataset for understanding continental-scale dynamics and evolution. |
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| Keywords: | East Asia Rayleigh wave tomography shear-wave velocity model lithospheric thickness |
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