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通过对伽师及邻近地区2005~2007年5期流动重力测量资料的系统分析,研究了该区域重力场的时空动态演化特征。结果表明,重力变化与构造环境变化有关,地震孕育发生阶段,重力场将有明显的异常变化。地震多发于重力变化正负值交替的零线附近,正负重力异常变化梯度带的附近是物质增减差异剧烈的地区,能量易于积累,从而产生地震。与GPS观测结果相互印证,表明受大的构造背景影响,测区内重力异常的正负值分布反映了区域间的应力挤压作用。
Based on the systematic analysis of 5 mobile gravity data collected in Jiashi and its adjacent areas from 2005 to 2007, the temporal and spatial dynamic evolution characteristics of gravitational field in this area are studied. The results show that the change of gravity is related to the change of tectonic environment. During the occurrence of earthquake, the gravitational field will have obvious abnormal changes. Earthquakes occur frequently in the vicinity of the zero line where the positive and negative changes in gravity occur alternately. In the vicinity of the gradient zone where the positive and negative gravity anomalies change, there is a sharp difference in material increase and decrease. Energy is easy to accumulate and an earthquake is generated. Confirmed with the results of GPS observations, it shows that the positive and negative distribution of gravity anomalies in the survey area reflect the stress squeezing between the regions due to the large tectonic setting.