Simulation of finite fault hybrid source models for the M w 6.6 Jiuzhaigou, China, earthquake
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ORIGINAL ARTICLE
Simulation of finite fault hybrid source models for the Mw 6.6 Jiuzhaigou, China, earthquake Pengfei Dang
&
Qifang Liu & Linjian Ji & Chong Wang
Received: 29 April 2020 / Accepted: 10 July 2020 # Springer Nature B.V. 2020
Abstract A hybrid source model for the Mw 6.6 Jiuzhaigou earthquake, China, based on the finite fault is established. The global parameters are estimated mainly according to the regional seismic structure, crustal structure, seismicity, and semi-empirical calibration laws. The local parameters are divided into two parts: the asperity part describing the deterministic slip and the k-square model describing the random slip. The source models are generated by 30 groups of simulation and are compared with those retrieved by other scholars. The results show that this method can be used as an effective approach to predict seismic source models.
Keywords Source model . Asperity body . Global parameter . Local parameter . k-square model
1 Introduction The Jiuzhaigou County, Sichuan Province, experienced an earthquake with a magnitude of Mw 6.6 On August 8, 2017, at the local time of 9:19:46 P.M. The epicenter was located at 33.2° N and 103.8° E, and the focal depth was 20 km, according to the China Strong-Motion Networks Center (CSMNC). In this earthquake, a total of 25 people
Highlights 1. The 30 groups of source models that may be generated by Jiuzhaigou earthquake are simulated. 2. The slip distribution of the Jiuzhaigou earthquake is selected. 3. The optional source model is verified. P. Dang (*) : C. Wang Institute Engineering Mechanics, China Earthquake Administration, No.29 Xuefu Road, Harbin 150080 Heilongjiang Province, China e-mail: [email protected]
C. Wang e-mail: [email protected] P. Dang : C. Wang Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration, Harbin 150080, China
Q. Liu School of Civil Engineering, Suzhou University of Science and Technology, No.1701 Binhe Road, , Suzhou 215011 Jiangsu Province, China e-mail: [email protected] L. Ji Central and Southern China Municipal Engineering Design & Research Institute Co., Ltd, No.41 Jiefang Park Road, Wuhan 430000 Hubei Province, China e-mail: [email protected] C. Wang Geophysical Exploration Center, China Earthquake Administration, No.75 Wenhua Road, Zhengzhou 450002 Henan Province, China
J Seismol
were killed, 6 people were untraceable, and at least 525 people were injured. It is reported that 66 groups of strong ground motion recordings were observed in this earthquake according to the CSMNC. However, only seven groups of records were observed within a range of 100 km from the focal point. These strong ground motion records provided the basic data for the simulation of the near-field strong ground motion. At present, the source models of most earthquakes are mainly obtained by far-field record inversion (Hartzell and Heaton 1983; Zhang et al. 2008; Wang et al. 2008; Nakamura et al. 2010; Hao et al. 2013; Hartzell et al. 2013). If the ground motion caused by the e
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