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*

Abstract

Abstract: 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 M_S≥7.0earthquakes,and enhancement of seismic activity was found before only one earthquake.Twenty-three M_S6.0~6.9 earthquakes 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.

Key words: Seismicity, Region-Time-Length(RTL)algorithm, Earthquake precursor, Sichuan-Yunnan region

CLC Number:

P315.7

LIU Yue, LU Xiao-jian, TIAN Qin-jian. Analysis of Seismicity Changes prior to Strong Earthquakes in Sichuan-Yunnan Region by the Region-Time-Length Algorithm[J]. EARTHQUAKE, 2016, 36(2): 94-104.

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

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