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本文分析了引起强震前天文测时测纬异常现象的原因问题,认为这种异常主要是地下水活动引起垂线变化的结果.垂线变化包括重力场水平分量变化和垂直分量变化,前者可引起测时测纬异常.地下水活动的主要形式是垂直迁移,这种垂直迁移又沿着一定的水平方向传递.从测时测纬的异常形态和地下水的活动规律,可以分析出应力场变化的某些规律.地下水的这种活动,引起的重力场水平分量变化远远大于垂直分量的变化,两者的变化形式也很不同.
This paper analyzes the causes of anomaly in the anomaly before astronomical measurements before the strong earthquakes and argues that this anomaly is mainly the result of vertical movements caused by groundwater activities.The vertical changes include the changes of horizontal and vertical components of the gravitational field.The former can cause The main measure of groundwater activity is vertical migration, which is also transmitted along a certain horizontal direction.From the abnormal shape of the measuring weft and the activity of groundwater, we can analyze the change of stress field These rules of groundwater cause the gravitational field horizontal components to change much more than the vertical components, and the changes of the two are very different.