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江苏省溧阳地震台于81年1月23日在井下66米深处安装成功Φ110mm电感探头,开始时用CD—2型精密电感电桥观测,观测综合误差小于50μH,从5月1日起,改用4103压磁应力仪观测,观测误差±10μh。观测条件符合规范要求,测值平时比较稳定,干扰因素不明显,整点值变动一般均小于20μh,日均值变动则更小。自安装以来溧阳老震区发生的二次有感地震均有前兆动态信息显示。
On January 23, 1981, Liyang Seismological Station of Jiangsu Province installed a successful Φ110mm inductive probe at a depth of 66 meters downhole. At the beginning, it used the CD-2 precision inductive bridge to observe the integrated error less than 50μH. From May 1, Use 4103 piezomagnetic stress gauge observation, observation error ± 10μh. Observed conditions meet the specifications, the measured value is usually stable, the interference is not obvious, the whole point value changes are generally less than 20μh, the daily average change is smaller. The second earthquakes occurred in the old earthquake zone in Liyang since the installation showed the dynamic information of precursors.