基于速率—状态摩擦准则的库仑应力转移模型的地震活动研究以川滇地区为例

doi:10.12196/j.issn.1000-3274.2024.04.003

Abstract

Abstract: The Sichuan-Yunnan region is located at the southeastern margin of the Qinghai-Xizang Plateau, where strong earthquakes have occurred frequently in recent years, drawing much attention to the study of strong earthquake activity trends in this area. This paper calculates the spatial distribution of M≥5.0 seismic activity rates caused by Coulomb stress perturbations resulting from 8 strong M_W≥6.5 earthquakes that occurred in the Sichuan-Yunnan region from 1976 to 2019, using the rate-state friction law and regional earthquake catalogs. The results indicate that the calculated seismic activity rates based on the rate-state friction criterion is generally consistent with the spatial distribution of M≥5.0 earthquakes that occurred between 2020 and 2023. Earthquake activity in the Sichuan-Yunnan region is jointly influenced by stress perturbations caused by strong earthquakes and seismogenic environments in different regions. The impact of strong earthquake stress perturbation fields on subsequent seismic activity is mainly concentrated in areas near strong earthquakes; while the higher seismic activity rates in some regions are related to the higher background seismic activity in the region. The areas with higher M≥5.0 seismic activity rates in the Sichuan-Yunnan region are located at the northern and southern ends of the Longmenshan fault, the Lijiang-Xiaojinhe fault, the Ruili-Longling fault, the Lancang River fault, and the Changning area. The results of this study provide new insights into the spatial and temporal distribution characteristics of moderate to strong earthquakes in the Sichuan-Yunnan region and serve as a reference for regional seismic hazard assessment.

Key words: Sichuan-Yunnan region, Coulomb stress, Rate-state friction law, Background seismicity

CLC Number:

P315.7

WANG Li-wei, WANG Hui, CAO Jian-ling, YAO Qi. Seismicity Related to Coulomb Stress Transfer Model and Rate-state Friction Criterion: A Case Study in the Sichuan-Yunnan Region[J]. EARTHQUAKE, 2024, 44(4): 26-44.

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Seismicity Related to Coulomb Stress Transfer Model and Rate-state Friction Criterion: A Case Study in the Sichuan-Yunnan Region

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