格尔木地震台钻孔应变仪映震性能分析*
李玉丽1,安黎霞2,李启雷1,杨晓霞1,孙春玲1

(1.青海省地震局,青海 西宁810000; 2.西宁市地震局,青海 西宁 810000)

格尔木地震台; 钻孔应变; 同震阶变; 体应变; 差应变

Analysis on Earthquake Response Ability of the Borehole Strain Meter in Golmud Seismic Station
LI Yu-li1,AN Li-xia2,LI Qi-lei1,YANG Xiao-xia1,SUN Chun-ling1

(1. Earthquake Administration of Qinghai Province,Xining 810001,Qinghai,China)(2. Earthquake Administration of Xining Municipality,Xining 810000,Qinghai,China)

Golmud Seismic Station; borehole strain; coseismic step change; volume strain; difference strain

备注

利用格尔木钻孔应变可靠的观测资料,通过分析典型震例前的分量日均值、差应变、日分钟值曲线变化特征,发现M≥7地震前有中短期异常,M≥6地震前有短临异常。通过分析震时分钟值曲线变化特征,发现钻孔应变仪同震阶变明显,两次海西地震的阶变幅度不尽相同。

Using the reliable observation data of the borehole strain at Golmud Seismic Station,we analyzed the variation characteristic of the component daily average,the difference strain and the day-minute value before the typical earthquakes,and found that there were anomaly in medium-term and short-term anomaly before M≥7.0 earthquakes and short impending before M≥6.0 earthquakes. Analyzing the variation characteristic of the minute value curve,we found that the coseismic step change of the borehole strain meter was obvious,and the amplitude of step change before two Haixi earthquakes was not the same.