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本文讨论的范围仅涉及长江以南的秭归、长阳、宜都三县部分地区。从历史记载及三峡台网二十余年的监测结果看,该区地震较少,具有弱震区的特点。除1961年3月8日宜都县老龙坪、1972年3月13日秭归周坪附近曾分别发生过Ms4.8、3.6级地震外,余者多属较小的有感地震。这些地震的空间分布彼此孤立,与本区日活动断层在空间位置上没有明显的对应关系;震级之小(一般在0.5—3.0左右),与区域性大断裂(如仙女山断裂)的规模、活动
The scope of this article deals only with parts of Zigui, Changyang and Yidu counties to the south of the Yangtze River. According to historical records and monitoring results of the Three Gorges Network for more than 20 years, there are fewer earthquakes in this area and the characteristics of weak earthquakes. Except for the Ms 4.8 and Ms 3.6 earthquakes that occurred on March 8, 1961 in Yalongping, Yidu County, March 13, 1972, respectively, around Zouping, Zhouping, there were mostly more earthquakes in the area. The spatial distribution of these earthquakes is isolated from each other, and there is no obvious corresponding relationship with the daily active faults in this area. The magnitude of the earthquakes is small (generally around 0.5-3.0) and the scale of the regional large faults (such as the Xiannushan fault) activity