邢台流动重力测网前兆异常变化特征研究

应用重力变化平面图和各点时序变化曲线．结合网区及周边地区震例，对邢台网重力场震前异常特征进行了研究。结果显示．网区重力场存在整体单调上升变化背景；重力场变化同周边地震活动水平明显相关；震前伴有网区重力场变化加速或转折过程，平面图出现大面积高值异常区。

Study on the Variation Characteristics of Precursor Anomalies of Mobile Gravity in Xingtai Observation Network

Based on plane graphs of mobile gravity variations and time sequence variations, combining earthquake cases within and around the Xingtai network, the anomaly characteristics of gravity field in Xingtai network before some earthquakes are studied in this paper. The results indicate that the gravity field within the network has the background with the raising feature, and the variations of the gravity field are obviously correlated to the surrounding earthquake active levels. Before earthquakes, the accelerating variation process or turning of gravity field appeared. At the same time, larger anomaly area with high values also comes forth in plane graphs.