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In this paper,the monitoring data of gravity tide of the Pixian station have been used.According to some methods of gravity and geodetic deformation in the guide of earthquakeprediction,such as tide analysis, non-tide analysis and dynamic grey analysis,we processed themonitoring data of the Pixian station. As a result of data processing,we researched the earthquakes which have occurred inSichuan from 1988 to 1992.And we gave the trend variation of gravity anomaly before anearthquake and the determination...

In this paper,the monitoring data of gravity tide of the Pixian station have been used.According to some methods of gravity and geodetic deformation in the guide of earthquakeprediction,such as tide analysis, non-tide analysis and dynamic grey analysis,we processed themonitoring data of the Pixian station. As a result of data processing,we researched the earthquakes which have occurred inSichuan from 1988 to 1992.And we gave the trend variation of gravity anomaly before anearthquake and the determination basis of short-term anomaly variation. The amplitude variationof gravity tide M2- wave is about 6%before the M6.0 Batang and Xiaojing earthquakes. The non-tide variation of short-term anomaly variations includes a lot of high- frequencyvariation from a few days to more than 20 days before an earthquake.

本文利用郫县台重力固体潮观测资料,按照中国地震预报指南重力及大地形变的有关方法:潮波分析、非潮波分析、动态灰箱等分析方法对郫县台资料进行了处理。根据资料处理结果,结合四川地区1988年~1992年所发生的大震及中强震,给出了地震前重力异常趋势变化及短临异常变化判别依据。巴塘、小金6级地震震前重力潮汐波M_2波幅度值变化达6%。在短临异常变化中,重力非潮汐变化在震前几天到20几天,出现许多高频变化。

 
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