基于“区域-时间-长度算法”分析川滇地区强震前地震活动性变化  

Analysis of Seismicity Changes prior to Strong Earthquakes in Sichuan-Yunnan Region by the Region-Time-Length Algorithm

作　　者：刘月[1] 吕晓健[1] 田勤俭[1] 

机构地区：[1]中国地震局地震预测研究所,中国地震局地震预测重点实验室,北京100036

出　　处：《地震》2016年第2期94-104,共11页Earthquake

基　　金：中俄科技合作专项(2012DFR20440K05)

摘　　要：本文基于＂区域-时间-长度算法＂（Region-Time-Length algorithm）回顾性检验了1976年以来发生在川滇地区的6个MS7.0以上和23个MS6.0-6.9地震前地震活动性变化。MS7.0以上强震前,5例检测到地震活动平静异常,仅1例检测到地震活动增强;MS6.0-6.9地震前,12例检测到平静,11例检测到地震活动增强。以上异常大部分出现于震前0.5-2.5a,持续0.5-2a。另外,发生在云南普洱地区的4个MS6.0以上地震震前都检测到平静异常;发生在北纬22.7°-31.0°N,99.6°-102.5°E范围内的17个地震,13例于震前检测到平静异常。以上研究对更好地认识川滇地区地震孕育过程和发震前兆提供了一些参考。The Region-Time-Length（RTL）algorithm was applied to analyze seismicity changes prior to the twenty-nine strong earthquakes in Sichuan-Yunnan region.Seismic quiescence was detected prior to five out of the six MS≥7.0earthquakes,and enhancement of seismic activity was found before only one earthquake.Twenty-three MS6.0-6.9earthquakes were analyzed as well.Twelve of them had the precursor of seismic quiescence,and the other eleven had anomalies of enhancement of seismic activity.Seismic quiescence or enhancement of seismic activity started 0.5to 2.5years before most of the earthquakes,and lasted for 0.5-2years.Seismic quiescence was detected prior to the four earthquake cases occurred in Puer area.Seismic quiescence was detected prior to thirteen out of the seventeen earthquakes occurred in the region of 22.7°-31.0°N and 99.6°-102.5°E.This study may provide references for a better understanding of the seismogenic process in the region.

关 键 词：地震活动性 RTL算法 川滇地区 

分 类 号：P315.7[天文地球—地震学]