Causal mechanism of injection-induced earthquakes through the M_w 5.5 Pohang earthquake case study.

ABSTRACT: Causal mechanisms for fluid injection-induced earthquakes remain a challenge to identify. Past studies largely established spatiotemporal correlations. Here, we propose a multi-process causal mechanism for injection-induced earthquakes through a case study of the 2017 M_w 5.5 induced earthquake near Pohang Enhanced Geothermal System, Korea, where detailed hydraulic stimulation and on-site seismicity monitoring data provide an unprecedented opportunity. Pore pressure modeling reveals that pore pressure changes initiate seismicity on critically stressed faults and Coulomb static stress transfer modeling reveals that earthquake interactions promote continued seismicity, leading to larger events. On the basis of these results, we propose the following causal mechanism for induced sei

SUBMITTER: Yeo IW 

PROVIDER: S-EPMC7251101 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature