2017年内蒙古阿拉善左旗5.0级地震震前异常总结

Anomaly before the Alxa Left Banner Ms5.0 earthquake in Inner Mongolia in 2017 and post-earthquake review

2017年6月3日内蒙古阿拉善左旗发生5.0级地震,宁夏回族自治区地震局对该地震进行了震前短临跟踪和震后回顾总结。分析认为:测震学资料存在“同心地震窗”开窗、海原震群事件和视应力高值等异常;地球物理场观测资料存在海原地电阻率突跳变化异常、固原地电阻率破年变下降异常和热红外短期显著异常。震前短临跟踪工作体现了地震预测指标体系对震情判定发挥的积极作用。

An MS 5.0 earthquake occurred in Alxa Left Banner,Inner Mongolia,on June 3,2017.The Earthquake Agency of Ningxia Hui Autonomous Region conducted pre-earthquake tracking and post-earthquake review for the earthquake.The seismic records show anomalies of the“Tongxin seismic window”,the Haiyuan earthquake swarm,and abnormal high apparent stress.The anomalies of geophysical field observation include the rising trend of water temperature in the Haiyuan-Ganyanchi,abruptly changing of the resistivity in the Haiyuan,the resistivity decreasing in the Guyuan without an annual change,and the short-term thermal infrared abnormal.The work of short and near tracking before the earthquake shows that the index system of earthquake prediction can play a positive role in earthquake situation determination.