中条山北麓断裂形变异常的研究

Study on the Ground Deformation Anomaly of the Fault at North Zhongtiao Mountain

叙述了山西地震带南端运城盆地及其周边100km范围近20a的地震活动特征,运用形变异常参数、差分、统计等方法对运城盆地内跨中条山北麓断裂的水准观测资料进行了研究。结果表明,断层大幅度形变速率异常变化较好地对应了研究区内1979年至2002年7次ML≥4.2的地震活动,且山西永济风柏峪测线自2001年8月至2002年4月仍存在一定的形变异常信息,表明,中条山北麓断裂目前正处于增强活动之中。

Seismicity characteristics in Yuncheng basin of the southern part of Shanxi seismic belt as well as its peripheral area, ranging 100 km, during last 20 years are described. A study is made for leveling data observed across the fault at north Zhongtiao Mountain in Yuncheng basin, by using ground deformation anomaly parameter calculation, difference and statistic processing. The result shows that large ground deformation rate anomalies at the fault well correspond to 7 earthquakes of M_L≥4.2 ,from 1979 to 2002, in the studied area. There were some ground deformation anomalies at observation line located at Fengbai Mountain of Yongji,Shanxi, which indicate that the activity of the fault at North Zhongtiao Mountain is going up.