STUDY ON THE CHARACTERISTICS,MECHANISM, AND SPATIAL DISTRIBUTION OF YUSHU EARTHQUAKE TRIGGERED LANDSLIDES

doi:10.3969/j.issn.0253-4967.2012.01.006

Abstract

Abstract:

On April 14,2010 at 07:49 (Beijing time), a catastrophic earthquake with M_S 7.1 struck Yushu County, Qinghai Province, China. About 2036 landslides, covering an area of about 1.194km², were interpreted from aerial photographs and remote sensing imageries and verified by field check. And based on the above, the spatial distribution of the Yushu earthquake triggered landslides is presented in this paper. The distribution of the landslides was strongly dominated by main surface ruptures, and their types are varied, with the collapse-type landslide as the dominant. There are five genetic mechanisms of Yushu earthquake triggered landslides, they are: the slope-toe excavation type, the surface water infiltration induced slope slip type, the fault dislocation type, the shaking type, and post-quake snow melting and rainfall penetration type. Besides the main seismic surface ruptures, there are many slope fissures developed mainly on the SE end of the surface rupture zone on the SW wall, an area undergoing intensive compression in the earthquake.

Key words: Yushu earthquake, triggered landslides, surface rupture, slope fissures

摘要：

2010年4月14日青海省玉树县发生了M_S 7.1地震。文中基于现场考察与遥感影像目视解译的方法,对玉树地震滑坡进行分析,并制作了玉树地震滑坡空间分布图。结果表明,该地震触发了约2 036处滑坡灾害,总面积约1.194km²;地震滑坡分布受主地表破裂控制作用强烈;滑坡类型多样,但以崩塌型滑坡为主;滑坡有5种成因机制:人工开挖坡脚型、地表水入渗致坡体震动滑动型、断裂错断震动型、震动型、后期冰雪融化或降雨入渗型;除地震主地表破裂外,还有许多坡体裂缝,主要分布在主地表破裂带SE端的SW盘,该部位在地震中受到了强烈的挤压作用。

关键词: 玉树地震, 地震滑坡, 地表破裂, 坡体裂缝

CLC Number:

P642

XU Chong, XU Xi-wei, YU Gui-hua. STUDY ON THE CHARACTERISTICS,MECHANISM, AND SPATIAL DISTRIBUTION OF YUSHU EARTHQUAKE TRIGGERED LANDSLIDES[J]. SEISMOLOGY AND GEOLOGY, 2012, 34(1): 47-62.

许冲, 徐锡伟, 于贵华. 玉树地震滑坡分布调查及其特征与形成机制[J]. 地震地质, 2012, 34(1): 47-62.

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