摘要
利用１／５０万彩色合成镶嵌的卫星图像，对羌塘块体及邻近大约５０万ｋｍ２地区的断裂活动性进行分析判读。根据断裂的影像特征，将所判读的断裂分成全新世活动、晚更新世活动和第四纪早、中期活动３类。结合本世纪以来的地震活动，分析了主要断裂的活动性。例如位于羌塘盆地以北，全新世明显左行走滑的玛尔盖茶卡－若拉错断裂带上，１９９７年１１月８日发生了玛尼７．５级地震，是该断裂带现代活动的表现。
The landsat images of color composit mosaic of 1∶500 000 are used to identify the fault activity in the Qiangtan and its neighboring areas of about 500 000km 2. Based on the image characteristics of fault, the identified faults are grouped into three types which are active in Holocene, late Plastocene, and early middle Quaterary, respectively. Considering earthquakes of this region since 1900, the activity of major faults are analyzed. For example, the Margaichace Ruolacuo fault zone located north to the Qiangtang basin is evidently of left lateral strike slip in Holocence. The Mani M 7.5 earthquake of November 8, 1997 occurred just at this fault showing the recent activity of this fault.
出处
《地震地质》
EI
CSCD
北大核心
1998年第3期201-207,共7页
Seismology and Geology
基金
中国石油天燃气总公司青藏石油勘探项目
