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地质论评  2005 

首都圈地区小震重新定位及其在地震构造研究中的应用

Keywords: 北京双差地震定位法圈地小震重新定位构造特征

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Abstract:

使用双差地震定位法对首都圈地区39°~41°N,115°~118°E范围内1980~2000年的2098个小震进行了重新定位,定位均方根残差从重新定位前的1.4s降到0.32s。重新定位后,地震活动多集中分布于北东与北西向断裂的交汇处,或密集成北东与北西向线性分布,与已知活动断裂具有密切的关系。在顺义与延怀盆地一带揭示出几条高角度北西向隐伏活动断裂,长度在10~20km间。小震活动显示的构造信息表明,北西向构造是重要的发震构造,在现今构造变形和地震孕育、发生中,与北东向构造起着同样重要的作用。同时,重定位震源深度分布在东西方向上显示出明显的不均匀性,推测是地壳变形和构造活动强弱在横向变化的一种反映。

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