Full waveform inversion of the crust and upper mantle beneath the East Asia Continent and Western Pacific Subduction Zone
- 1Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, Michigan 48824, USA
- 2Department of Earth and Environmental Sciences, Michigan State University, East Lansing, Michigan 48824, USA.
- 3Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles, California 90095, USA
- 4School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.
- 5Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
- 6School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
We present a three-dimensional transversely isotropic velocity model of the crust and upper mantle beneath the East Asia Continent and Western Pacific subduction zone based on the full waveform inversion (FWI). It minimizes waveform shape misfit between the synthetics and the observations from a large dataset, with 142 earthquakes recorded by about 2,000 broadband stations in East Asia. Compared to the previous models, the new FWI model, East Asia Radial Anisotropy Model 2020 (EARA2020) after 20 iterations shows much stronger wave speed perturbations within the imaged slabs including the Japan, Kuril, Izu-Bonin, Ryuku slabs. The high wave speed anomalies of the subducted slabs have a maximum perturbation of 8% for Vp and 13% for Vs. We have also systematically analyzed the slabs’ morphology, the intraplate tectonic structures including the North China Craton, the Sichuan Basin, and the Songliao Basin. and investigated the origin of four typical intra-continent volcanos in the continent of China including the Hainan volcano, Changbaishan volcano, Tengchong volcano, and Datong volcano.
How to cite: Xi, Z., Chen, M., Zhou, T., Wang, B., and Kim, Y.: Full waveform inversion of the crust and upper mantle beneath the East Asia Continent and Western Pacific Subduction Zone, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-13849, https://doi.org/10.5194/egusphere-egu21-13849, 2021.
