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一、概况继美国研制出Sacks-Evertson体应变仪后,中国地震局地壳应力研究所于20世纪80年代初也相继研制出TJ系列钻孔体积式应变仪。它是通过岩石钻孔的体积变化导致仪器内液体压强变化来进行地应变精密测量的。能清晰地测到体应变固体潮汐变化,精度达10~(-10)。特别是在“九五”期间,“TJ-II”系列体应变仪无论是在数量、质量上均得到了较大的发展。目前全国已有体应变台站25个,有的已正常观测近20年,为地震预测预报积累了丰富的资料和经验。全国体应变观测台站分布如图1,有关参数如表1所示。
First, the profile Following the United States developed a Sacks-Evertson body strain gauge, the Chinese Institute of Earthquake Crustal Stress Institute in the early 1980s have also developed a series of TJ borehole volumetric strain gauge. It is through the rock drilling volume changes lead to changes in the pressure inside the instrument to carry out geodetic precision measurement. Can clearly measure the body strain tidal changes, accuracy of 10 ~ (-10). Especially in the “Ninth Five-Year” period, “TJ-II” series of body strain gauges both in terms of quantity and quality have been greatly developed. At present, there are 25 stations of body strain stations in the country, some of which have been normal observed for nearly 20 years and have accumulated rich data and experience for earthquake prediction and prediction. National body strain observation station distribution shown in Figure 1, the parameters shown in Table 1 below.