【摘要】 2010年4月14日07时49分在青海省玉树县发生了7.1级地震,震中位于33.2°N,96.6°E,自玉树县城至隆宝镇造成了大量房屋倒塌和人员伤亡。地震发生在NW向的玉树-甘孜断裂两段的玉树-治多断裂上,自隆宝镇东至玉树县城,地震引起了长约50km的地震地表破裂带,主要分布在第三纪红砂岩、高漫滩及河床中,致使公路错断、桥梁位错,并引发大量滑坡和崩滑。震中附近的调查表明,地表破裂带主要沿NW向的玉树-治多断裂展布,总体走向NW320°,分为两组,一组为NW向,另一组为NE向,NW向的破裂为左旋走滑,发育一系列小的类拉分盆地,NE向的破裂表现为正断性质。由震源机制解和断裂特征判定,NW向的玉树-治多断裂为此次地震的发震构造。更多还原

【Abstract】 The 2010 Yushu Earthquake that measured at M_s 7.1 occurred at 7:49 on April 14,2010,in Yushu County, Qinghai Province.The epicenter is 33.2°N,96.6°E.Thousands of houses collapsed from the Jiegu town to Longbao town in Yushu County.The earthquake occurred as the result of movement of the Yushu-Zhiduo fault which is NW segment of Yushu-Ganzi fault.From the location of micro-epicenter to Yushu County,surface rupture which length is about 50km distributes along Yushu-Zhiduo fault.The ruptures are also found in the Tertiary red sandstone,high floodplain and riverbed.Along the surface ruptures,roads and bridges were destroyed and dislocated,and a lot of landslides were trigged by the shock.According field work,a series of NW-trending and NE-trending surface ruptures distribute along the Yushu-Zhiduo fault zone.The NW-trending rupture is left strike-slip and more small pull-apart basins were developed.The NE-trending rupture is extension.The earthquake’s epicenter and focal-mechanism are consistent with it having occurred as the result of movement on the Yushu-Zhiduo fault or a tectonically related fault.更多还原