A comprehensive earthquake source database for China's strong-motion flatfile (2007-2020)

Abstract

The National Strong-Motion Observation Network System of China has collected over 12 000 strong-motion recordings from 2007 to December 2020. This study assembled the source-related metadata of 1 920 earthquakes associated with assembled well-processed recordings of China. The earthquake basic information, focal mechanisms, and the fault geometry were collected from various institutes and literature. We recommended the M_W values for 900 earthquakes, the fault types for 1 064 earthquakes, and the fault geometries for 18 large earthquakes. We also performed the statistical analysis for establishing the empirical conversions of M_W-M_S, and M_L, and providing the empirical relationships between M_W and ruptured area, aspect ratio, respectively. Moreover, the ruptured fault geometries of large earthquakes were used to preliminarily divide all earthquakes considered into 1 141 mainshocks, and 779 aftershocks. The finite-fault distances (R_JB and R_rup) of strong-motion recordings from the 18 large earthquakes were calculated, and then used to yield the statistic relationships between the point-source distances (R_epi and R_hyp) and finite-fault distances. We finally provided the earthquake source database freely accessible at website. The source-related metadata can be directly applied to develop the ground motion prediction equations of China.

Keywords

Earthquake source database / Earthquake basic parameters / Focal mechanism / Ruptured fault geometry / Strong motion flatfile

Data and resources

The earthquake source database compiled in this study is freely available at the website www.gmm-cn.com/gmm-report/.

CRediT authorship contribution statement

Hongwei Wang: Writing - review & editing, Writing - original draft, Formal analysis, Data curation, Conceptualization. Hongrui Li: Writing original draft, Data curation. Yefei Ren: Writing - review & editing, Writing - original draft, Funding acquisition, Data curation, Conceptualization. Ruizhi Wen: Formal analysis, Conceptualization.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Author agreement and Acknowledgment

National Key R&D Program of China (Grant No. 2019YFE0115700). This work is possible thanks to Yousef Bozorgnia from University of Califor-nia, Los Angeles for providing valuable suggestions on designing the source-related metadata. We thank Guixi Yi from Earthquake Adminis-tration of Sichuan Province, Li Zhao from Peking University, and Yihai Yang from Earthquake Administration of Shaanxi Province for providing us the focal mechanism solutions. We thank Yong Zhang from Peking University, Weimin Wang from Institute of Qingzang Plateau Research, Chinese Academy of Sciences, Xu Zhang from Institute of Geophysics, China Earthquake Administration, Jinlai Hao from Institute of Geology and Geophysics, Chinese Academy of Sciences, Gang Liu from Institute of Seismology, China Earthquake Administration, Ao Zheng from Southern University of Science and Technology, and Shaoyan Wen from Institute of Disaster Prevention for providing us the inversion results of source rupture model. We wish to thank Yong Zhang from Peking University, Yongge Wan from Institute of Disaster Prevention, Guixi Yi from Earth-quake Administration of Sichuan Province, Guanghui Dai from China Earthquake Networks Center, and Ruifeng Liu from Institute of Geophysics, China Earthquake Administration for their answers to the problems in the collection and collation of source-related information. The China national and province borders in Fig. 1 and the fault in Fig. 6 are freely derived from the GMT Chinese Community (https://docs.gmt-china.org/latest/dataset-CN/CN-border/; https://github.com/gmt-china/china-geospatial-data/releases; https://docs.gmt-china.org/latest/dataset/CN-faults/).

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