灾害学2025，Vol.40Issue(1)：220-226,234,8.DOI:10.3969/j.issn.1000-811X.2025.01.034
2017年8月8日九寨沟地震的余震序列特征与地震灾害效应
The Characteristics of Earthquake Sequence and Seismic Disaster Effects of the Jiuzhaigou Earthquake on August 8,2017
摘要
Abstract
Although the 2017 Jiuzhaigou Ms7.0 earthquake did not result in significant surface ruptures,the secondary geological disasters it triggered were particularly severe,with the northern area of mainshock suffering more severely than the southern area.Source parameter inversion for earthquakes(M≥3)in the northern segment of the Jiuzhaigou earthquake sequence is conducted based on the Cut and Paste method.Rupture directivities of two Ms4.1 earthquakes are determined by using the source time-frequency characteristic method.Besults show that the Jiuzhaigou earthquake may have triggered the activity of a branch fault within the Minjiang fault zone.Based on the source mechanisms and distribution of the aftershocks,we speculate that this fault is a right-lateral strike-slip fault with a certain thrust component.Furthermore,the structural characteristics of the geological faults,the distribu-tion of aftershocks,and the directivity of seismic ruptures provide a satisfactory explanation for the mechanism un-derlying the triggering of numerous secondary disasters in the northern segment of the Jiuzhaigou earthquake.关键词
九寨沟地震/震源参数/破裂方向性/地质构造/地震滑坡Key words
Jiuzhaigou earthquake/source parameters/rupture directivities/geological structure/earthquake-triggered landslide分类
资源环境引用本文复制引用
刘婷,何骁慧,计婷婷,覃乙根,郑文俊..2017年8月8日九寨沟地震的余震序列特征与地震灾害效应[J].灾害学,2025,40(1):220-226,234,8.基金项目
第二次青藏高原综合科学考察研究资助项目"活动断裂与地震灾害(二次青藏高原综合科学考察研究)"(2019QZKK0901) （二次青藏高原综合科学考察研究）
国家重点研发计划"大陆区域动力学模型构建"(2023YFC3007301) （2023YFC3007301）
