地震地质 ›› 1991, Vol. 13 ›› Issue (4): 289-305.

• 科研简报 •    下一篇

北京西北狼山-黄柏寺断裂带几何学分段的冲沟纵剖面标志

程绍平, 杨桂枝, 杨喆   

  1. 国家地震局地质研究所, 北京 100029
  • 收稿日期:1989-12-31 出版日期:1991-12-04 发布日期:2009-11-25
  • 基金资助:
    地震科学联合基金资助项目。

LONGITUDINAL STREAM-PROFILES AS INDICATORS FOR GEOMETRIC SEGMENTATION OF THE LANGSHAN-HUANGBAISI FAULT ZONE, NORTHWEST BEIJING

Cheng Shao-ping, Yang Gui-zhi, Yang Zhe   

  1. Institute of Geology, State Seismological Bureau, Beijing 100029, China
  • Received:1989-12-31 Online:1991-12-04 Published:2009-11-25

摘要: 北京西北的狼山-黄柏寺断裂带是延庆盆地北缘正断裂带的西南部分,两个130°—140°的主要弯曲把它分成了走向不同的三个断层段落。 利用Hack的方法分析了沿该断裂带的71条冲沟纵剖面,显示出它们对断层几何学分段很好的地貌响应。在两个弯曲部位,比降指标K值较高。三个断层段落在K值、K值水平分组、裂点(具有高SL/K比值)分级,以及主河长度-面积关系等方面有很大不同。 冲沟纵剖面是正断层几何学分段重要的构造地貌标志,并将为各段落的运动学和古地震学提供认识。

关键词: 北京, 狼山-黄柏寺断裂带, 几何分段, 冲沟纵剖面, 比降指标

Abstract: The Langshan-Huangbaisi fault zone in northwest Beijing is the southwestern part of the normal fault zone on the northern margin of the Yanqing basin, 35.5km long and NNE-NEE-trending in general, on which two major 130?- 140? bends separate it into three segments with different strikes.Using the Hack's method, 71 longitudinal stream-profiles along the fault zone are analysed, shawing a well geomorphic response to the fault geometry. On these two major bends the gradient indices,K values, are relatively high. These three segments greatly differ in K value.Longitudinal stream-profiles are good tectonic-geomorphic indicators for geometric Segmentation of normal faults and will prqvide insight into segmented kinematics and paleoseismology.

Key words: Beijing, Langshan-Huangbaisi fault zone, Longitudinal stream-profile, Geometric segmentatoin, Gradient index