2023年12月2日芒市M_(S)5.0地震前地震活动异常  

Seismicity anomalies before Mangshi M_(S)5.0 earthquake on December 2,2023

作　　者：高琼 杨树锋 张华英 杨芬 GAO Qiong;YANG Shufeng;ZHANG Huaying;YANG Fen(Dali Center of China Earthquake Science Experimental Site,Yunnan Province 671000,China;Field Science Observation and Research Station on Crustal Tectonic Activity in Northwest Yunnan,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 [2]云南大理滇西北地壳构造活动野外科学观测研究站,云南671000

出　　处：《地震地磁观测与研究》2024年第5期53-59,共7页Seismological and Geomagnetic Observation and Research

摘　　要：总结2023年12月2日云南芒市M_(S)5.0地震发生前地震活动异常,发现震前存在中期、短期和临震异常。其中:(1)中期阶段:滇西地区M≥5.0地震存在东西迁移规律,且M_(L)≥4.0地震活动具有由滇西北向小滇西迁移的特点;(2)中短期阶段:小滇西地区中小地震活动显著增强,3、4级地震围成孕震空区并伴随出现M_(L)≥3.0地震条带;(3)短期阶段:出现逼近地震和前兆震群,临震前10天发生前震。分析认为,“逼近地震”和前兆震群的发生,是地震孕育过程从中期转入短临阶段的拐点。This paper summarizes the seismicity anomalies before the M_(S)5.0 earthquake in Mangshi,Yunnan Province on December 2,2023.It is found that there are medium-term,short-term,and imminent anomalies before the Mangshi earthquake.In the medium-term stage,the M≥5.0 earthquakes in western Yunnan have the east-west migration rule,and the M_(L)≥4.0 earthquakes migrate from northwest Yunnan to west Yunnan.In the medium and short-term stages,the small and medium earthquakes in the west of Yunnan region are significantly enhanced,magnitude 3-4 earthquakes formed a seismogenic gap,and M_(L)≥3.0 earthquakes formed a seismic belt.In the short-term stage,an impending earthquake and a precursor swarm appear,and foreshocks occur 10 days before the Mangshi M_(S)5.0 earthquake.It is concluded that the occurrence of the impending earthquake and precursor swarm is a sign that the seismogenic process has changed from the medium-term to the short-imminent stage.

关 键 词：芒市M_(S)5.0地震 孕震空区 地震条带 逼近地震 前兆震群 

分 类 号：P315.5[天文地球—地震学]