青藏高原北部活动地块内部的活断层定量资料  

QUANTITATIVE DATA OF ACTIVE FAULTS WITHIN THE ACTIVE TECTONIC BLOCK IN NORTH QINGHAI-XIZANG PLATEAU

作　　者：刘百篪[1] 曹娟娟[2] 袁道阳[1] 何文贵[1] 

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]云南省地震局,昆明650224

出　　处：《地震地质》2008年第1期161-175,共15页Seismology and Geology

基　　金：国家重点基础研究发展规划项目(G199804070104)资助中国地震局兰州地震研究所论著编号:lc20070055

摘　　要：文中定义了祁连山活动地块的边界,列表给出了近十几年来在青藏高原北部活动地块内部的活断层定量资料。其内容主要包括：活断层的编号、名称、产状、主要的地质地貌标志、活动年代、断层分段、断层滑动速率、古地震及其年代、地震破裂带的主要特征等。这些资料表明：青藏高原北部活动地块的8级大地震集中在它的边界活断层上,断层的滑动速率都在5-12mm/a左右;7级左右的地震发生在其内部规模较小的断层上,断层的滑动速率都在1-3mm/a左右;青藏高原北部活动地块内部的活断层,可以将该活动地块划分为几个次级地块,这些次级活动地块以变形为主,没有发生旋转;我们的结果支持青藏高原＂连续变形＂的假说。This paper defines the boundaries of north Qinghai-Xizang plateau active tectonic block and offers quantitative information of active faults within the north Qinghai-Xizang plateau active tectonic block in the past dozen years. The information mainly include： the serial number, name, attitude of active fault,main geological geomorphic signs, activity age, fault segmentation, fault slip rate, paleo-earthquake and its date, and the major features of earthquake rupture zones and so on. These data indicate that great earthquakes with M ≥ 8 concentrate on the boundary active faults of the north Qinghai-Xizang plateau active tectonic block, and the slip rate of the faults all reaches about 5 - 12mm/yr. Earthquakes of about M7 occurred on the smaller-scale active faults inside the north Qinghai-Xizang plateau active tectonic block. Generally, the slip rates of these active faults are 1 - 3 mm/yr. The north Qinghai-Xizang plateau active tectonic block can be divided into several sub-blocks, and these active sub-blocks are dominated with deformation, and no rotation occurred. Our result supports the hypothesis of continuous deformation of Qinghai-Xizang plateau active tectonic block.

关 键 词：青藏高原 活动地块 活断层 定量资料 

分 类 号：P315.2[天文地球—地震学]