岷县-漳县MS6.6地震前后甘肃前兆异常及响应特征

Precursor Anomalies and Response Characteristics in Gansu Province Before and After the Minxian-Zhangxian MS6.6 Earthquake

摘要:

分析总结了2013年7月22日甘肃岷县-漳县M_S6.6地震前后甘肃前兆台网观测资料变化情况，发现该地震前有7个台站、4种观测手段、14个测项出现了明显的异常，既有长期、中长期异常，也有短期和短临异常，说明对资料的分析既要看短期变化，还要看中期和长期变化。出现异常测点的震中距多数在200 km范围之内。另外部分水位、流量和水温测点的资料记录到不同程度的同震效应；形变观测多数测点记录到比较明显的同震响应，记录同震响应的测点与震中位置、方向、距离无明显关系。

Abstract:

In this study, we analyzed and summarized the observation data from the Gansu precursor network before and after the Minxian-Zhangxian M_S6.6 earthquake in Gansu on July 22, 2013, and found that there were obvious anomalies at seven stations, 4 observation methods, and 14 test items before the earthquake, including long-term, mid-term, short-term, and impending anomalies. Most epicenter distances with anomalous measuring points were within 200 km. In addition, different degrees of co-seismic effects were recorded by the water level, flow rate, and water temperature measuring point data. Obvious co-seismic responses were recorded by most measuring points of the deformation observation. The measuring points of the recorded co-seismic responses have no obvious relation with the location, direction, and distance of the epicenter.