青海钻孔应变强震前异常特征分析  

Analysis on the anomalous characters of the borehole strain before strong earthquake in Qinghai Province

作　　者：李玉丽[1] 李启雷[1] 孙春玲[1] 杨青春[1] 杨晓霞[1] 

机构地区：[1]青海省地震局,中国西宁810001

出　　处：《地震地磁观测与研究》2016年第6期80-84,共5页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局监测;预测;科研三结合课题(编号:152903)

摘　　要：选取2007年以来青海省6套YRY-4分量钻孔应变仪观测资料,采用非潮汐和潮汐分析方法,对观测资料进行分析处理。结果发现:1格尔木地震台钻孔应变差应变曲线显示中短期速率异常,而德令哈地震台则显示超2倍标准差异常;2乐都地震台钻孔应变振幅因子显示突跳型异常,且异常时间短,而潮汐因子表现为下降—恢复型异常。The observation data recorded by the six sets of YRY-4 component borehole strainmeter in Qinghai Province were selected since 2007. Non tidal and tidal analysis method was used to analyze the data.The results showed that： ① There were medium term rate anomaly in shear stain curve of the borehole strain meter at Golumd; The shear strain curve of the borehole strain at Delingha showed anomalies that more than ② times of the standard deviation. 2 There were breakaway anomalies on amplitude factor curve of the borehole strain meter at Ledu Seismic Station, in very short period, and there were downward-recovery type anomalies in tide factor curve of the borehole strain meter at Ledu Seismic Station.

关 键 词：钻孔应变 差应变 振幅因子 潮汐因子 

分 类 号：P315.72[天文地球—地震学]