京西-晋冀蒙地区水系与新构造应力场的关系

Ralationship Between the Drainage System and Neotectonie Stress Field in the West of Beijing,Shanxi,Hebei and Inner Mongolia

一、引言利用水系分布方向的密集度,探讨水系分布的格局与构造应力场之间的关系,是最近提出来的。许多同志,在不同的地区作了有益的尝试,得出的结论与用其它地质资料得出的构造应力场基本吻合。由于此方法有一定的实用价值,本文拟用此方法对北京—河北—山西部分地区水系格局与构造应力场之间的关系作一些探讨。二、地理地质概况本区位于北纬39°20’—41°20’,东经113°—117°,包括京西—晋冀蒙的部分地区,有大、小河流30余条。水系总长度为15140km。水系主要分布在延庆、怀来。

In this paper, the drainage system in the west of Beijing, Shanxi, Hebei and Inner Mongolia was computed by the method of nonfreedom in drainage system distribution, which was based on density about arrangement of drainage system, especially on the relation between arrangement of drainage system and stress field. The direction of maximum compressive stress in the area was compared with earthquake mechanism soulutions, stress measurement and stress release.Then we came to the conclusion that the regional tectonic stress field in this area is in NE direction since the Cenozoic era.