Open Access

ARTICLE

Regional Finite-Fault Source Model for Development of Ground Motion Attenuation Relationship in Sichuan, China

by Wei Jiang^1,2,*, Zelin Cao^3,4

1 College of Civil Engineering and Water Conservancy, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
2 Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China
3 School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China
4 School of Civil Engineering, Hebei University of Engineering, Handan, 056038, China

* Corresponding Author: Wei Jiang. Email:

Structural Durability & Health Monitoring 2023, 17(1), 37-54. https://doi.org/10.32604/sdhm.2022.013444

Received 06 August 2020; Accepted 25 December 2020; Issue published 02 March 2023

Abstract

The attenuation relationship of ground motion based on seismology has always been a front subject of engineering earthquake. Among them, the regional finite-fault source model is very important. In view of this point, the general characteristics of regional seism-tectonics, including the dip and depth of the fault plane, are emphasized. According to the statistics of regional seism-tectonics and focal mechanisms in Sichuan, China, and the sensitivity of estimated peak ground acceleration (PGA) attenuation is analyzed, and the dip angle is taken as an average of 70°. Based the statistics of the upper crustal structure and the focal depth of regional earthquakes, the bottom boundary of the sedimentary cover can be used as the upper limit for estimating the depth of upper-edge. The analysis shows that this value is sensitive to PGA. Based on the analysis of geometric relations, the corresponding calculation formula is used, and a set of concepts and steps for building the regional finite-fault source model is proposed. The estimation of source parameters takes into account the uncertainty, the geometric relationship among parameters and the total energy conservation. Meanwhile, a set of reasonable models is developed, which lay a foundation for the further study of regional ground motion attenuation based on seismology.

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Keywords

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