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精河MS6.6地震前地下流体异常特征分析
钟骏, 王博, 周志华
中国地震台网中心, 北京市西城区三里河南横街5号 100045
摘要:
对2017年8月9日精河MS6.6地震周边地下流体异常进行了分析和总结。结果表明,距精河MS6.6地震震中400km范围内存在7项异常,异常持续时间具有阶段性的特点,以1~8个月的异常为主。异常在空间上分布不均一、不连续,异常出现时间与震中距间的关系不明显。部分异常形态特征具有明显的重现性。结合前人的研究结果分析认为,区域构造应力、应变的变化是异常出现的主要原因。
关键词:  精河MS6.6地震  地下流体  异常特征  异常成因
DOI:
分类号:P315
基金项目:中国地震局震情跟踪定向工作任务(2017010311、2018010310)共同资助
Analysis on Anomaly Characteristics of Underground Fluid Before the Jinghe,Xinjiang MS6.6 Earthquake in 2017
Zhong Jun, Wang Bo, Zhou Zhihua
China Earthquake Networks Center, Beijing 100045, China
Abstract:
We summarized and analyzed the anomalies of the underground fluid associated with the Jinghe MS6.6 earthquake on August 9,2017. The results showed that there are 7 anomalies in the area of 400km around the epicenter,and the abnormal duration is periodical,mainly from 1 to 8 months. The anomalies are inhomogeneous and discontinuous in space,and the relationship between occurrence time of anomalies and epicenter distance is not obvious. Parts of anomalies have obvious reproducibility. Based on previous achievements,it is considered that the change of the regional tectonic stress and strain is the main reason of abnormal occurrence.
Key words:  Jinghe MS6.6 earthquake  Underground fluid  Anomaly characteristics  Genesis of anomaly