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本文针对手簿检验中发现的问题,评定了不同仪器、不同观测方法所能达到的实际精度,用加权平均的办法计算段差、点值及其变化。两条测线都有300到500微伽的重力变化,这和以前的结果基本一致。但通过分析,确认这种变化主要是格值变化及台差造成的,而不是地球重力场的真实变化。在消除系统误差后,距海城地震震中较近的盖县一东荒地测段重力差震前与震后各期仍有100微伽左右的变化,可能与海城地震有关。
In this paper, according to the problem found in the hand book test, the actual accuracy that different instruments and different observation methods can reach is evaluated, and the step difference, point value and change are calculated by weighted average method. Both lines have a gravitational change of 300 to 500 microgas, which is basically the same as before. However, through analysis, it is confirmed that such changes are caused mainly by grid values and station differences, not real changes in the Earth’s gravitational field. After eliminating the system error, there is still about 100 microgatts before and after the earthquake in Gai county eastward wasteland, which is close to the epicenter of the Haicheng earthquake, which may be related to the Haicheng earthquake.