摘要
On April 14,2010,a devastating earthquake measured 7.1 on the Richter scale struck Yushu county,Qinghai Province,China.Field geological investigation and remote sensing interpretation show that this earthquake generated an inverse "L-shaped" surface rupture zone,approximately 50km long.The surface rupture zone can be divided into three segments.Between the northern and middle segments of the surface rupture,there is a 16km-long segment,where no rupture was observed.The middle and the southern segments are arranged in a left-step manner,and there are right-step en echelon ruptures developed in the stepovers.The seismogenic structure is the Yushu fault,which is dominated by strike-slip with a small amount of thrust component.The earthquake results from the differential movements between the southern Qiangtang Block and northern Bayan Har Block.The earthquake recurrence interval is 185a^108a.Along an approximately 20km-long part of the Garzê-Yushu fault,between the southern surface rupture of Yushu MS7.1 earthquake and the 1896 earthquake,there is no surface rupture,its seismic risk needs further research.
On April 14, 2010, a devastating earthquake measured 7.1 on the Richter scale struck Yushu county, Qinghai Province, China. Field geological investigation and remote sensing interpretation show that this earthquake generated an inverse ＂L-shaped＂ surface rupture zone, approximately 50km long. The surface rupture zone can be divided into three segments. Between the northern and middle segments of the surface rupture, there is a 16km-long segment, where no rupture was observed. The middle and the southern segments are arranged in a left-step manner, and there are right-step en echelon ruptures developed in the stepovers. The seismogenic structure is the Yushu fault, which is dominated by strike-slip with a small amount of thrust component. The earthquake results from the differential movements between the southern Qiangtang Block and northern Bayan Har Block. The earthquake recurrence interval is 185a^108a. Along an approximately 20km-long part of the Garze-Yushu fault, between the southern surface rupture of Yushu Ms7. 1 earthquake and the 1896 earthquake, there is no surface rupture, its seismic risk needs further research.
基金
funded by National Key Basic Research and Development Program(grant No.2008CB42570),China
