Over 100 small‐ to moderate‐sized earthquakes, including an Mw 5.0 event, were detected during September 2015 to November 2016 near the town of Cushing, Oklahoma. The seismic sequence was spatial‐temporally linked to four wastewater disposal wells within 4 km. We calculate pore pressure and stress perturbations caused by fluid injection at multiple wells and analyze seismic risk in a Coulomb failure stress framework. Despite being more than an order of magnitude smaller than the pore pressure perturbation, the sign of shear stress change, in the sense of assumed right‐lateral fault motion, dictates where earthquakes are induced. Most of the relocated earthquakes are located within areas of positive shear stress changes. Our results suggest that poroelastic stress changes also play an essential role in the wastewater disposal environment, and a strategic design of well locations with respect to fault orientation and direction of motion can help mitigate induced seismic hazard.

中文翻译：

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俄克拉荷马州库欣的孔隙弹性应力扰动与多井井场诱发地震序列的相关性

包括Mw在内的100多次中小型地震在2015年9月至2016年11月之间，在俄克拉荷马州库欣镇附近发现了5.0事件。地震序列在时间上与4公里以内的四个废水处理井相关。我们计算了多口井中流体注入引起的孔隙压力和应力扰动，并在库仑破坏应力框架下分析了地震风险。尽管比孔隙压力扰动小一个数量级，但在假定的右断层运动的意义上，剪切应力的变化指示了地震的发源地。大部分搬迁的地震位于正切应力变化区域内。我们的结果表明，多孔弹性应力变化在废水处理环境中也起着至关重要的作用，