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本文依据表层构造辰布特征、重力、磁力场背景及航磁资料反映的基底构造性质,对四川盆地南部及相邻的滇黔部分地区的地壳结构、构造应力场及潜在的震源区进行了深入探讨。研究表明,该区的构造应力场具有多向性和多期性,在古生代,主压应力方向为近南北向,近代转为近东西向。东西向深断裂活动微弱,仅发生一些微小地震,但东西向深断裂与其他方向断裂交汇区往往是发生地震的场所。另外,不同岩性的基底接壤地带也是地震多发区。
Based on the features of the surface cloth structure, gravity, magnetic field background and the basement structural properties reflected by aeromagnetic data, the paper deeply studies the crustal structure, tectonic stress field and potential source regions in the southern and adjacent parts of Yunnan and Guizhou in the Sichuan Basin Discussion. The study shows that the tectonic stress field in the area is multidirectional and multi-period. During the Paleozoic, the principal compressive stress direction was nearly north-south direction and the modern direction was nearly east-west direction. The weak activity of the east-west fault shows only a few minor earthquakes, but the intersection of the deep fault and the other directional faults is often the place where earthquakes occur. In addition, the basement bordering areas of different lithologies is also an earthquake prone area.