Influence of Fault Architecture on Induced Earthquake Sequence Evolution Revealed by High‐Resolution Focal Mechanism Solutions
Influence of Fault Architecture on Induced Earthquake Sequence Evolution Revealed by High‐Resolution Focal Mechanism Solutions
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DOI：
10.1029/2022jb025040
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Yan Qin;Xiaowei Chen;Ting Chen;R. Abercrombie
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文献类型：
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作者：
Yan Qin;Xiaowei Chen;Ting Chen;R. Abercrombie
近年来，地震活动的增加和地震观测网络的改进为探索影响诱发序列的触发过程、时空演化和最大震级的因素提供了机会。我们绘制了俄克拉荷马州四个诱发序列的断层结构和应力状态图，以确定它们对地震活动的影响。我们系统地重新定位地震，并使用各种技术（包括机器学习）计算数百个中小事件（1.0 < M < 5.1）的震源机制，用于古特里，伍德沃德，库欣和费尔维尤序列。详细的断层几何形状和地震活动和应力状态的时空演化揭示了每个序列不同的主导驱动力。在库欣和费尔维尤（最大地震≥M5.0），主要的断层结构是近垂直的窄走滑断层，大多数小地震断层面的方向最佳。这两个序列表现出不连续的时间迁移，但强震自驱动破裂增长。在古特里和伍德沃德（最大的事件
The increasing seismicity and improved seismic observation network in recent years provide an opportunity to explore factors that influence the triggering processes, spatiotemporal evolution, and maximum magnitude of induced sequences. We map the fault architecture and stress state of four induced sequences in Oklahoma to determine their influence on the seismicity. We systematically relocate the earthquakes and compute hundreds of focal mechanisms of small to medium events (1.0 < M < 5.1) using various techniques, including machine learning, for the Guthrie, Woodward, Cushing, and Fairview sequences. The detailed fault geometry and spatiotemporal evolution of seismicity and stress states reveal different dominant driving forces for each sequence. In Cushing and Fairview (largest event ≥M5.0), the main fault structures are near‐vertical narrow strike‐slip faults, with most of the small earthquake fault planes optimally oriented. The two sequences exhibit discontinuous temporal migration but strong earthquake self‐driven rupture growth. In Guthrie and Woodward (largest event