We present a detailed analysis of the 10 June 2019 ML 4.0 Ohio earthquake sequence, which is the largest earthquake that struck Lake County, northeastern Ohio, since 1986. This sequence is well recorded by local seismic networks, which provides an unprecedented opportunity to understand the local seismotectonics. We utilize a waveform‐based cross‐correlation method to identify ∼12 times more events than reported by the Advanced National Seismic System (ANSS) Comprehensive Earthquake Catalog: the whole sequence started with several small earthquakes (⁠ML 1–2) beginning 12 March 2019, and the last one occurred ∼1min immediately before the ML 4.0 mainshock; many previously unreported aftershocks (⁠ML 0.3–2.2) are found, which were active for the first week after the mainshock; another major sequence with a 7 December 2019 ML 2.6 mainshock occurred and also started with a few smaller events beginning in mid‐November and was followed by its own aftershocks. The relocated seismicity delineates a linear feature, orientation of which is consistent with the resolved focal plane that may correspond to the ruptured fault. Our results highlight that closer monitoring of local seismicity is crucial for understanding the seismotectonics and mitigating future seismic hazard around the southern Great Lakes.

中文翻译：

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从 2019 年 ML 4.0 俄亥俄州地震序列对伊利湖断层系统的新见解

我们对 2019 年 6 月 10 日 ML 4.0 俄亥俄州地震序列进行了详细分析，这是自 1986 年以来袭击俄亥俄州东北部莱克县的最大地震。当地地震网络很好地记录了这一序列，这提供了前所未有的机会来了解局部地震构造。我们利用基于波形的互相关方法来识别比先进国家地震系统 (ANSS) 综合地震目录报告的事件多 12 倍的事件：整个序列始于 3 月 12 日开始的几次小地震 (⁠ML 1-2) 2019 年，最后一次发生在 ML 4.0 主震前约 1 分钟；发现了许多以前未报告的余震（⁠ML 0.3-2.2），它们在主震后的第一周一直活跃；2019 年 12 月 7 日 ML 2 的另一个主要序列。11 月中旬发生了 6 号主震，并以一些较小的事件开始，随后发生了余震。重新定位的地震活动描绘了一个线性特征，其方向与可能对应于破裂断层的解析焦平面一致。我们的结果强调，对当地地震活动进行更密切的监测对于了解地震构造和减轻五大湖南部未来的地震危害至关重要。