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利用国家重大科学工程“中国地壳运动观测网络”1998—2008年绝对重力和相对重力的观测资料,获得了南北地震带地区的重力场及其动态变化,从动态的观点研究了2008年5月12日汶川8.0级地震前后区域重力场演化特征及其与地震活动的关系.重力场变化既具有时-空分布的不均匀性,同时又具有与活动断裂构造密切相关和与地震孕育发展有着内在联系.重力场动态变化图象较清晰地反映了汶川大地震孕育、发生过程中出现的重力前兆信息.
The gravitational field and its dynamic changes in the north-south seismic zone are obtained by using the observation data of the absolute gravity and relative gravity of the National Significant Science Project “China Crustal Movement Observation Network ” from 1998 to 2008. From the dynamic point of view, The evolution of regional gravitational field before and after Wenchuan M8.0 Earthquake on January 12 and its relationship with the earthquake activity.The gravitational field changes both inhomogeneity of time-space distribution and at the same time is closely related to the active faults and the development of the earthquake The internal images of the gravitational field show that the dynamic changes of gravitational field reflect the gravitational precursors that occurred in the Wenchuan earthquake more clearly.