河北省数字水位短临异常特征研究——以2016年唐山4.2级地震为例

Study on the short-term anomaly characteristics of the digital water levels Hebei Province——A case study of Tangshan M_S 4.2 earthquake

2016年9月10日河北唐山发生M_S 4.2地震,以该震为例,研究河北省地下流体观测井水位震前异常变化特征。结果表明:(1)震中区域观测井水位异常变化形态一般为缓变型,震中外围观测井水位异常变化形态一般为骤变型;(2)距离震中越近,观测井水位异常出现越早,异常持续时间越长;(3)临近地震震中时,观测井水位异常有从震中向外围扩散的趋势;(4)观测井水位异常最大幅度与井震距关系不大。

On Sep.10, 2016, the M_S 4.2 earthquake occurred in Tangshan City, Hebei Province. The anomalous changes of water level in the underground fluid observation wells in Hebei Province are studied. The results show that：（1） The anomalous change of the water level in the epicenter area is generally slow, and the anomalous change of the water level in the Epicenter periphery is generally the sudden change;（2） The closer the epicenter to the observation wells, the earlier the water level anomaly occurs, and the longer the abnormal duration;（3） Near the earthquake, the abnormal water level of observation wells have the tendency to spread from the epicenter to the periphery;（4） The maximum amplitude of abnormal water level have little relationship with the distance between wells and earthquake.