CSRM‐1.0: A China Seismological Reference Model
Year: 2024
Type: article
Abstract: High‐resolution seismic model is crucial for advancing our understandings on geological processes and enhancing seismic hazard mitigation programs. We construct a high‐resolution China Seismological Reference Model (CSRM‐1.0) in the top 100 km of the crust and uppermost mantle in continental China following a top‐down construction process. The employed seismic constraints include P‐ wave polarization angle from tele‐seismic event, short‐period Rayleigh wave ellipticity from ambient noise, long‐period Rayleigh wave ellipticity from earthquake data, receiver function, empirical Green's function from ambient noise, Rayleigh wave phase/group velocity dispersion curves from regional earthquakes, and Pn ‐wave travel time extracted from seismic data of 4,435 stations. CSRM‐1.0 has a spatial crustal resolution of ∼60 km beneath the north‐south seismic belt and trans‐North China orogen regions and ∼120 km beneath the rest of continental China, and a spatial mantle resolution of ∼300 km. CSRM‐1.0 exhibits prominent velocity heterogeneities in the crust and uppermost mantle and an eastward thinning of the crust, geographically correlating with geological settings. CSRM‐1.0 improvements include accurate estimation of shallow seismic structure, increased spatial resolution and improved model accuracy. Crustal composition inferred from CSRM‐1.0 exhibits a general transition from a felsic upper crust to a mafic lower crust. Mafic rocks in the lower crust are found predominantly along inter‐block boundaries and sporadically within the interiors of blocks, likely resulted from preferential inter‐block intrusions of magmas related to various oceanic plate subductions and the Emeishan mantle plume. This study contributes seismic constraints and CSRM‐1.0 to the CSRM product center ( http://chinageorefmodel.org ) as a backbone open‐access geophysical cyberinfrastructure.
DOI: 10.1029/2024jb029520
Authors: Xiao Xiao, Shihua Cheng, Jianping Wu, Weilai Wang, Li Sun, Xiaoxin Wang, Jiayu Ma, Yinghua Tong, Xiaofeng Liang, Xiaobo Tian, Hongyi Li, Qi‐Fu Chen, Sheng Yu, Lianxing Wen
Institutions: University of Science and Technology of China, Institute of Geophysics, China Earthquake Administration, China Earthquake Administration, Chinese Academy of Sciences, Institute of Geology and Geophysics, State Key Laboratory of Lithospheric Evolution, China University of Geosciences, China University of Geosciences (Beijing), University of Chinese Academy of Sciences, Stony Brook University
Language: English
Topic: Seismic Waves and Analysis
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,880
OpenAlex ID: W4402694530