念青唐古拉山山前断裂位于中国板块与印度板块间的地缝合线附近,属切穿花岗岩质层的基底断裂。在这条断裂的西藏羊八井段附近,1951年11月18日和1952年8月18日曾相继发生8.0级和7.5级两次强烈地震,说明该段断裂现今仍在活动。为了解其现今活动深度,并为了解在地缝合线的这个部位是否有地幔物质上涌,我们与美国加利福尼亚大学Scripps海 The Nyainqentanglha fault piedmont fault is located near the suture between the China plate and the Indian plate, and is a basement fault that cuts through the granitic bedrock. Near the fractured Yangba section of Tibet, two strong earthquakes of 8.0 and 7.5 occurred successively on November 18, 1951 and August 18, 1952, indicating that the fault is still active today. In order to understand its current depth of activity, and in order to understand whether this part of the suture material surge in the mantle, we and the University of California Scripps sea