2008年3月21日盈江5．3级地震前长中短临异常特征的研究  

Study of long-medium-short-imminent term anomalies before Yingjiang M 5.3 earthquake on Mar. 21, 2008

作　　者：杨芬 金明培 赵家本 李宗兴[2] 邓嘉美 

机构地区：[1]国地震局滇西地震预报实验场办公室,中国大理671000中 [2]保山市地震局,中国云南67800

出　　处：《地震地磁观测与研究》2009年第2期49-56,共8页Seismological and Geomagnetic Observation and Research

摘　　要：在地震短临跟踪工作过程中，我们发现，2008年3月21日盈江5．3级地震前，在地震活动性方面，长中短临不同时段内呈现出各种形态的异常，小震活动呈现条带、围空和平静－活跃的过程。地下流体前兆异常水氡趋势性中期异常呈现同步性转折，水氡突变性短临异常呈现同步性突跳，近源区和邻区的水汞呈现同步性高值异常；而且，地下流体前兆异常形成区域与中强震发生地点有一定的构造关联性。因此，对2008年3月21日盈江5．3级地震前地震活动性长中短临各阶段呈现的异常．中短临地下流体前兆异常，进行了系统回顾和总结，理清预报思路，以便更好地指导今后的工作。In this paper, the author analyzed the long-term, medium-term, short-term and imminentterm anomalies before the M 5.3 Yingjiang earthquake on Mar. 21, 2008, included the seismicity, such as seismic belt, seismic gap, seismic-density of small earthquakes, and hydrogeochemical parameters, such as radon and mercury change and so on. It is found that various anomalies have occurred before the earthquake during different terms. For example, in medium-term, radon monitoring showed synchronous trending transition, in short-term, both radon and mercury showed synchronous abrupt pulse. The study also showed that the distribution of stations with anomalies concentrated close to the epicenter. This result will he helpful for prediction of such kind of earthquakes in the future.

关 键 词：盈江5.3级地震 长中短临异常 地震活动性 地下流体 

分 类 号：P315.72[天文地球—地震学]