西安地裂缝勘察中的地震勘探

Seismic Exploration for the Investigation of Ground Fissure in Xi'an

提出了隐伏地裂缝和次级地裂缝是现今工程地震勘探的主要对象 ,并根据探槽资料给出了隐伏地裂缝潜伏的深度 ;根据地震勘探剖面提出了地裂带除主裂缝外还存在一个规模较大的次级裂缝 ,次缝位于主缝上盘 ,与主缝呈"丫"字型构造 ,在深度 30 0～ 5 0 0m处与主缝汇合 ;文中最后提供了西安地裂缝不同勘察阶段的地震勘探观测系统经验参数 ,并给出依地震勘探结果开挖探槽的验证实例。

The potential ground fissures and the subordinate fiss ures are the main objects of seismic exploration in engineering investigation. S everal photos for the trenches of the ground fissures in Xi′an show that the po t ential fissures are under the ground surface for 3～5 m. A large-scale subordin a te fissure is found in the ground fissure belt after the seismic exploration. Th e said fissure forms 'Y' shape with the main fissure and merges into the main fissure at the depth of 300～500m. The empirical parameters for the seismic expl o ration and surveying are presented,and the practice examples to verify the resu lts of seismic exploration are given.