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一、前言我国研制生产的TJ-IA型体积式钻孔应变仪,于80年代后期在华北地区开始布设。体积式应变仪灵敏度高,达到了同类仪器的国际先进水平。该仪器系统的频率范围为0～5Hz,应变测量范围为1×10~(-10)～1×10~(-4),分辨率达到10~(-10)量级,可进行模拟输出或数字输出,填补了我国体积式应变仪的空白。目前,已在华北、东北和华东地区安装了17台,取得多年连续观测资料,在地震监测预报中发挥了较好的作用。体应变台分布如图1
I. Introduction TJ-IA-type volumetric borehole strain gauges developed and manufactured in China began to be laid in North China in the late 1980s. Volumetric strain gauge high sensitivity, reached the international advanced level of similar instruments. The instrument system frequency range of 0 ~ 5Hz, strain measurement range of 1 × 10 ~ (-10) ~ 1 × 10 -4, resolution of 10 ~ (-10) on the order of the analog output or Digital output, to fill the gap of our volumetric strain gauge. At present, 17 units have been installed in North China, Northeast China and East China and many years of continuous observation data have been obtained, which has played a good role in earthquake monitoring and prediction. Body strain table distribution in Figure 1