邢台隆尧典型断层蠕滑型地裂缝成因初析

1966年邢台地震发生后,震中所在地隆尧地区多次发生规模较大的地裂缝现象,通过实地调查工作,在隆尧县南(经过震中所在地白家寨村)发现一条断续分布的长约17km的地裂缝,在局部伴有地层错动现象。通过地球物理勘探对华北平原地质构造及断层近期运动规律特征做了进一步调查,认为隆尧地裂缝的地层错断现象主要原因是由于断层蠕滑活动形成的,表现为地壳构造运动产生的内应力的积累与释放。另外,长期干旱和过量开采等自然及人类活动因素也会使地下水逐年下降引起地裂缝。

Cause analysis of creep type ground fissures for Longyao typical faults in Xingtai

When Xingtai Earthquake occurred in 1966, many occasions of ground fissures took place in the epicenter location around Longyao area. Through field investigation, the authors found that a discontinuous distribution of ground fissure about 17km long in south Longyao (through the epicenter location of the Baijiazhai Village), locally associated with the phenomenon of formation dislocation. By geophysical investigations on the geological structures in North China Plain and the recent fault movement research and analysis, the authors found that the stratigraphic fault phenomenon for Longyao ground fissure was resulted from fault creep activities, showing the accumulation and release of internal stress occurred by crustal tectonic movement. In addition, some natural and human activities like long-terms of drought and excessive exploitation of groundwater were the affecting factors of ground water level decrease year by year.