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涿县台用同一型号的地震仪进行井下摆与地面摆的对比实验表明:井下摆的监测能力大大超过地面摆,给平原和工业噪声大的地区开辟了观测微震的可行途径;由于地震动的振幅在地下比地面小,井下摆所定震级普遍低,采用振动持续时间测定震级可得到较为满意的结果。在初至波的震相方面,本文对井下摆与地面摆之间存在的问题及其原因提出了一些看法。
The results of comparison between downhole and ground using the same type of seismograph in Yixian station show that the monitoring ability of the underground pendulum greatly exceeds that of the ground and opens up a feasible way of observing microseismicity in the plains and areas with high industrial noise. The amplitude is smaller in the ground than the ground, and the magnitude of the downhole is generally low. Satisfactory results can be obtained by using the vibration duration to determine the magnitude. In the first-break wave phase, this paper put forward some opinions on the existing problems and their causes between the underground pendulum and the ground pendulum.