九寨沟7.0级地震前泾源形变异常变化分析

Deformation data changes in Jingyuan Seismic Station before the M7.0 Jiuzhaigou Earthquake

以2017年8月8日四川省阿坝州九寨沟县7.0级地震为研究对象,利用宁夏泾源形变观测资料,采用常用的形态法以及潮汐因子变化分析了此次地震的前兆异常。分析表明,震前泾源形变观测点伸缩仪、垂直摆倾斜仪观测数据均出现了明显的震前异常,趋势异常表现为长期上升,短期、短临异常表现在震前转向或加速,震后观测资料恢复到原来的状况。

Firstly the deformation data observed in Jinyuan Seismic Station in Ningxia Hui Autonomous Region are processed in order to calculate the tide factors.The observatory instrument includes the strain gauge and tilt gauge.Then the morphological analysis is used to find precursor anomaly that may be correlative to the M 7.0 Jiuzhaigou Earthquake on 8 August 2017.These morphological changes include the long-term increasing,the short-term and impending earthquake precursor anomaly.After this earthquake the data shows the normal morphological statu.