An empirical attenuation model of the peak ground acceleration (PGA) in the near field of a strong earthquake

Xianglong Yao (), Shengwen Qi (), Chunling Liu (), Songfeng Guo (), Xiaoling Huang (), Chong Xu (), Bowen Zheng (), Zhifa Zhan () and Yu Zou ()
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Xianglong Yao: Institute of Geology and Geophysics, Chinese Academy of Sciences
Shengwen Qi: Institute of Geology and Geophysics, Chinese Academy of Sciences
Chunling Liu: China Aero Geophysical Survey and Remote Sensing Center for Natural Resources
Songfeng Guo: Institute of Geology and Geophysics, Chinese Academy of Sciences
Xiaoling Huang: Institute of Geology and Geophysics, Chinese Academy of Sciences
Chong Xu: National Institute of Natural Hazards, Ministry of Emergency Management of China
Bowen Zheng: Institute of Geology and Geophysics, Chinese Academy of Sciences
Zhifa Zhan: China Highway Engineering Consultants Corporation
Yu Zou: Institute of Geology and Geophysics, Chinese Academy of Sciences

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 105, issue 1, No 33, 715 pages

Abstract: Abstract Empirical methods are commonly employed to predict the PGA distribution of an earthquake and are widely used. However, current empirical methods assume the seismic source to be a point source, a line source, or a plane source, where the energy is concentrated and released uniformly. An empirical attenuation model of the near-field peak ground acceleration (PGA) was proposed that considers a nonuniform spatial distribution of seismic fault energy and its 3D scale. Then, this model was used to reconstruct the PGA distribution of the 2008 Wenchuan, China, Mw7.9 earthquake based on the data of a seismic fault model and ground acceleration records of the mainshock and aftershocks collected by seismic stations. The predicted PGA values show similar attenuation characteristics to the interpolated map of the PGA recorded by seismic stations. A comparison with the results of a finite-fault model developed by the USGS indicates that the proposed model can provide more details and give a more precise result in the near field. The analysis of landslides triggered by the Wenchuan earthquake demonstrates that the PGA distribution estimated by this model can be used to validate the findings of other researchers.

Keywords: Peak ground acceleration (PGA); Empirical attenuation model; Near field; Strong earthquake; The 2008 Wenchuan earthquake; Earthquake-induced landslides (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-020-04332-x

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