2021年5月21日漾濞M_(S)6.4地震前地震活动异常分析  

Analysis of the seismicity anomalies before Yangbi M_(S)6.4 earthquake on 21 May 2021

作　　者：高琼 邓嘉美 陈佳 GAO Qiong;DENG Jiamei;CHEN Jia(Dali Center of China Earthquake Science Experimental Site,Yunnan Province 671000,China)

机构地区：[1]中国地震科学实验场大理中心,云南671000

出　　处：《地震地磁观测与研究》2021年第5期51-57,共7页Seismological and Geomagnetic Observation and Research

摘　　要：2021年5月21日漾濞发生M_(S)6.4地震,震前地震活动异常明显,中长期阶段云南地区3级地震活动水平较低,滇西北地区出现长达456天的4级地震平静;短临阶段震中区附近出现3—4级地震条带;临震阶段中小地震活动由外围地区开始向震中区迁移,震中区出现直接前震。An M_(S) 6.4 earthquake occurred in Yangbi,Yunnan on May 21,2021.The seismicity anomaly characteristics were obvious before the earthquake.For the medium-and long-term anomalies,the activity of the earthquake of magnitude 3 in Yunnan was at a relatively low level and the earthquake quiescence of magnitude 4 in Northwest Yunnan lasted 456 days.A seismic belt of M 3-4 earthquakes formed quickly in the short-term and impending stage.Small and medium earthquakes began to migrate from the peripheral area to the source area and direct foreshocks occurred in the source area in the impending stage.Some of the seismic activity anomalies that occurred before the earthquake provide a good basis for us to determine the time and place of short-term prediction.

关 键 词：漾濞地震 地震平静 地震条带 直接前震 

分 类 号：P315.5[天文地球—地震学]