资源环境科技发展态势分析平台

Using data from nodal geophones and broadband seismometers, this study investigates the seismicity near Red Deer, Alberta, a region with increasing cases of hydraulic fracturing (HF) induced earthquakes. A cluster of 417 events was detected, and their spatial distribution and focal mechanisms reveal a NE‐trending rupture area with two strike‐slip fault planes. Reactivation of pre‐existing faults by pore pressure diffusion is likely responsible for the occurrence of the earthquake sequence following the M_L 4.18 mainshock. The temporal sequence of reactivated fault orientations suggests apparent changes in the local stress field following the mainshock, which is also responsible for a remotely triggered cluster observed one month after the mainshock. This secondary triggering process highlights the need to consider trailing seismicity during risk assessment.