龙首山地区构造应力场初步探讨  

Preliminary study on the geotectonic stress field in the Longshoushan Mt

作　　者：董治平[1] 赵天生[1] 代炜[1] 陈瑶[1] 郑田新[1] 刘长才[2] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]天祝县地震局,甘肃天祝733200

出　　处：《华南地震》2005年第1期1-7,共7页South China Journal of Seismology

基　　金：地震联合基金资助课题(197025;504004);中国地震局兰州地震研究所论著编号:LC20040074.

摘　　要：讨论了沟谷成因与构造应力场的关系,利用沟谷资料计算了龙首山地区的主压应力方向,结果表明,主压应力为北东向。新构造应力场、现代构造应力场、地震应力场趋于一致。认为晚第三纪以来,龙首山地区地壳构造应力场相对稳定,应该是青藏地块与阿拉善地块相互作用的结果。In this paper, starting with the formative mechanism of the valley, the relationship between the valley trends and tectonic stress field is discussed. Based on the data of the valley trends, the orientation of maximum principal stress in the Longshoushan Mt is calculated. The study results show that the orientation of compressive principal stress is NE and the modern tectonic stress field is in keep with geotectonic stress field and seismic stress field. So it is considered that the geotectonic stress field in the investigated area since Neogene has always been kept relative, which may be due to the collision between Qingzang and Alasahan plates.

关 键 词：构造应力场 沟谷 主压应力方向 地震应力场 龙首山 

分 类 号：P315.72[天文地球—地震学]