2022年青海门源M_(S)6.9地震前地下流体异常特征分析  

Analysis on Anomalous Characteristics of Underground Fluid before the Menyuan,Qinghai M_(S)6.9 Earthquake in 2022

作　　者：钟骏 冯晓博 王博[1] 周志华[1] 晏锐[1] ZHONG Jun;FENG Xiaobo;WANG Bo;ZHOU Zhihua;YAN Rui(China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]中国地震台网中心,北京100045

出　　处：《地震研究》2022年第2期308-317,共10页Journal of Seismological Research

基　　金：国家重点研发计划(2018YFE0109700);中国地震局震情跟踪定向工作任务(2022010309)联合资助。

摘　　要：对2022年1月8日青海门源M_(S)6.9地震前,震中附近地下流体观测资料及异常特征进行分析,结合震前预测过程进行了回顾性总结。结果表明:门源地震震中500 km范围内存在9项异常,其中8项为中短期异常,均出现在震前6个月;异常在空间上分布不均匀,主要集中于震中南部200 km范围内;本次门源地震与2016年门源M_(S)6.4地震和2021年玛多M_(S)7.4地震前的地下流体异常存在一定的相同性及差异性变化。In this paper,the observational data and the anomalous characteristics of the underground fluid around the epicenter of the Menyuan M_(S)6.9 earthquake on January 8,2022 are systematically analyzed,and the prediction process of this earthqake is retrospectively summarized.The results show that there are 9 anomalies within 500 km of the Menyuan epicenter,and 8 of them are medium-short term anomalies appearing 6 months before the earthquake.The anomalies are evenly distributed in space,mainly located within 200 km south of the Menyuan epicenter.There are similarities and differences on anomalous characteristics of the underground fluid between the 2022 Menyuan M_(S)6.9 earthquake and the other two earthquakes,the 2016 Menyuan M_(S)6.4 earthquake and the 2021 Maduo M_(S)7.4 earthquake.

关 键 词：门源M_(S)6.9地震 地下流体 异常特征 

分 类 号：P315.723[天文地球—地震学]