张北6-2级地震及晋北地区的重力场变化

GRAVITY FIELD VARIATION IN NORTH SHANXI AREA CAUSED BY NORTH ZHANGJIAKOU EARTHQUAKE OF M_S6.2

对张北6-2 级地震震中区的地壳深部构造和靠近震中区的晋北地区的重力场变化进行了研究。认为,区域构造运动、地壳深部物质迁移和区域应力场的积累是这次地震的主要原因。晋北地区地震前后出现了明显的重力场变化,并具有异常范围大、幅度高的特点。

Through the epicentre area structure of north Zhangjiakou earthquake and gravity field variation in north Shanxi region are studied, it is considered that the earthquake is caused by the regional structural movement, deep crust material transport and regional stress accumulation. The large scale and amplitude of gravity field anomaly variation appeared in north Shanxi area before the earthquake.