Rupture Directivity of the 2019 Mw 5.8 Changning, Sichuan, China, Earthquake and Implication for Induced Seismicity,Bulletin of the Seismological Society of America

当前位置： X-MOL 学术 › Bull. Seismol. Soc. Am. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Rupture Directivity of the 2019 Mw 5.8 Changning, Sichuan, China, Earthquake and Implication for Induced Seismicity
Bulletin of the Seismological Society of America ( IF 3 ) Pub Date : 2020-10-01 , DOI: 10.1785/0120200013
Wei Li ₁ , Sidao Ni _{2,

3} , Chong Zang ₁ , Risheng Chu _{2,

3}

Affiliation

On 17 June 2019, an ML 6.0 earthquake struck the Changning county in Sichuan Province of China, causing substantial casualties and property losses. The earthquake is the largest and the most damaging event in the Changning area and close to shale gas and salt mining production region. To investigate the possibility of the earthquake being induced, we resolve its rupture dimension and hypocentral depth via modeling of local seismic waveforms. The result reveals that its hypocentral depth is about 4 km, much shallower than most tectonic earthquake in surrounding regions. From moment tensor inversion (nodal plane 1 [NP1], strike 125°/dip 46°/rake 28°; NP2, strike 14°/dip 70°/rake 132°), the earthquake is found to be a strike‐slip event with significant thrust component. We resolved rupture directivity via measuring the difference between centroid location and hypocenter location, and found that the causative fault is NP1 and ruptured northwestward with length about 14 km. Based on its shallow hypocentral depth, and proximity to nearby mining regions, we hypothesize that the Changning earthquake might be an induced event due to long‐term fluid injection for salt mining. However, interdisciplinary studies are needed to test the hypothesis, including simulation of fluid migration and investigation of background stress as well as resolving mechanical parameters of the rocks in the epicentral regions.

更新日期：2020-09-25

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>