地震前后重力场变化的典型震例分析

系统总结了中国地震局地球物理勘探中心利用流动重力资料进行地震预报的实践经验,研究了8次地震的孕震环境、重力场变化、成因分析和预报实况等。结果表明,一次较强的地震前,处于不同地段的重力测点和测段都要出现上升-下降-上升或下降-上升-下降的较明显的中、短期异常变化;重力场的变化图象较清晰地反映了地震前后重力场的演化过程。

ANALYSIS ON THE GRAVITY FIELD CHANGE OF THE TYPICAL CASES BEFORE AND AFTER EARTHQUAKE

The practical experience on earthquake prediction by mobile gravity measurement data of Research Center of Exploration Geophysics,China Earthquake Administration were summed up in detail and the seismogenic circument,gravity field change,cause of formation,prediction result and so on about 8 earthquakes were studied.The result showed that the different gravity observational point appeared medium-short term anomolies obviously,which is rising-falling-rising or falling-rising-falling,before a stroger event.The evolution process before and after a event was reflected clearly by the gravity change image.