我国的钻孔应力-应变地震前兆监测网，是全国地震前兆监测台网的一个组成部分。
The seismological networks for borehole stress strain precursor surveilance in China are a part of the national seismological networks for precursor surveilance.
前兆观测中的噪声问题，不仅存在于单点单手段的前兆观测中，而且还存在于有多点多手段的前兆台网中。
The problem of noise exists not only in a single observational point with single means but also in networks with many observational points and means.
中国地震地下水动态观测网是我国仅次于测震网的第二大地震前兆观测系统。
The groundwater observation well-network for earthquake prediction in China is the largest precursory observation system except the seismograph array.
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