• 责任者：Diao Guiling (Earthquake Administration of Hebei Province ; Shijiazhuang 050021 ; China) ; Wang Xiaoshan
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(8)
• 关键词：震源机制 ; focal mechanism ; 四川 ; Sichuan Province ; 青海 ; Qinghai Province
• 页码：p.1778-1783
• 图表：4 illus., 19 refs.
• 分类号：0500
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

The epicenter of Kunlun Mountain Pass Earthquake and Wenchuan Earthquake was located at the northern and eastern boundary of Bayankala Block respectively and the Yutian earthquake on the western end of it. GPS observational data indicate that the block moves to east. The rupture characteristics of the three large earthquakes in different parts of the block suggest the mechanical consistency of the Bayankala block motion. The intensity and frequency of Yutian aftershocks significantly increased before the main shock and the stronger aftershock of Wenchuan earthquake, which proves that there is an internal relation between the three large earthquakes. The M_w6.9 Yushu earthquake, the M_w6.9 Karakorum mountain earthquake and the M_w7.5 Mani earthquake all occurred on the southern boundary of Bayankala block, and their focal mechanisms are consistently left-lateral strike slip, which were caused by the eastward motion of Qiangtang block and formed a new strong earthquake group. The results show that the block has the character of rigid body motion which is the common origin of the two large earthquake groups.