【摘要】 绘制了河北省文霸网流动重力测值的时序变化曲线和空间等值线,从动态的角度分析了观测对网区及周边地震的反应。重力异常呈现下列特征:震前异常持续时间约2年左右,变化量值在几十微伽;异常主要形态表现为持续下降,震前转折;邢台5.4级地震和文安5.1级地震前网区重力场均出现了显著的、连续的高值异常区;网区内的文安5.1级地震的震中位于重力变化零等值线附近的高梯度带上。更多还原

【Abstract】 The time sequence curves and spatial isolines of mobile gravity observational values from the Wenba net in Hebei province are drawn,and the response of gravity observation to earthquakes in the net and its surrounding area is analyzed.The gravitational anomalies showed the following characteristics: the anomalies might last out about 2 years,and its magnitude can reach tens μg;most anomalies showed continually decreasing and turning before earthquake;some high value region appeared in the gravitational field of Wenba net before Xingtai M5.4 and Wen’an M5.1 earthquakes;the epicenter of Wen’an earthquake located near the 0 isoline of high grads region.更多还原