摘要
本文运用断面擦痕滑动矢量分析方法,用 Etchecopar 电算法定量反演了自贡地区的平均构造应力场。结果表明:自贡地区第四纪构造应力场曾发生过重大变化,主压应力轴方向由北西向转为北东向,垂直运动分量加大。这种变化是局部应力调整的结果,并在地表形成切割早期构造的北西向断裂。
In this paper,the fault slip vector analysis,an up—to—date tectonic analytical method is applied in the inversion for the average tectonic stress field in Zigong area with Etchecopar computer Proce- dure.The result shows that the Quaternary tectonic stress field had ever changed significantly,the main stress axle direcion became NE from NW.The change resulted from local stress adjustment and resulted in NW faults which cut older structure
出处
《四川地震》
1991年第4期9-14,共6页
Earthquake Research in Sichuan
关键词
自贡市
应力场
矢量
断面
擦痕
fault slip vector method
tectonic stress field
NW fault
quantitative investigation.
