云南地区的环境应力参数及其在地震短临预报中的应用  

Application of Environment Stress Parameter to the Short-term and Impending-Earthquake Prediction in the Yunnan Area

作　　者：钱晓东[1] 秦嘉政[1] 叶建庆[1] 

机构地区：[1]云南省地震局,昆明650041

出　　处：《地震研究》2006年第1期7-12,共6页Journal of Seismological Research

基　　金：云南省重点科技攻关项目(NG2001)资助

摘　　要：利用云南区域数字地震台网的数字化记录资料,研究了云南地区1999年1月至2003年11月的环境应力τ0值。结果表明:地面运动峰值速度(r.v)符合M10/2τ0的标度关系,较适合云南地区中小地震的统计规律;用单位破裂长度的环境剪应力即归一化环境剪应力0τc值来描述一定地区应力场强度比用0τ值更好;通过对1999年以来云南及邻区发生的所有5级以上地震进行检验发现,79%的5级以上中强地震震前40天左右出现0τc高值群体异常或单点异常,其中群体异常占异常总数的60%,另外,对未来主震发生的地点具有指示意义的地震占有异常地震的60%。We use the digital records of the Yunnan Telemetered Digital Seismic Network to study the environment stress value T0 in the Yunnan region from Jan. 1999 to Nov. 2003. The result shows the peak velocity of ground movement （ r · v） accords with the calibration relations of M01/2T0. This result is suitable for the law of moderate and small earthquake activity in Yunnan. And it is better to describe the stress field with T0c, the environment shear stress value in a given area, than only with T0. By studying the change of environment stress field before the Ms ≥5 earthquakes in Yunnan since 1999, we found single or group of high T0c-values appears 40 days before 79% earthquakes, and group anomalies amount to 60% ; and the anomalous change of T0c can indicate the location of the mainshock before 60% earthquakes with anomaly. It is a new probe applying digital waveform date to short-term and impending-earthquake prediction.

关 键 词：云南区域台网 中小地震 环境应力 地震短临预报 

分 类 号：P315.727[天文地球—地震学]