玉树地震地表破裂调查与灾后重建避让选址研究
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本文为中国地质调查局国土资源大调查项目(编号 1212010914025)资助的成果


Investigation and Research on the Surface Rupture of the Yushu Earthquake and Reconstruction Site Selection
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    摘要:

    2010年4月14日07时49分40.7秒,青海省玉树县发生Ms7.1级地震。通过现场调查和分析,玉树地震的发震断裂是甘孜—玉树活动断裂的玉树段,地震产生的地表破裂长度为23km,走向北西西—北西,总体表现为左旋走滑特征,可进一步分为3段:西段呈连续延伸的左旋走滑破裂,在隆宝镇的“郭央烟宋多”附近(坐标:北纬33°03′11″、东经96°51′26″)最大水平位移达1.75m,可定为宏观震中;中段主要位于县城南侧,由多条右阶斜列的破裂组成;东段表现为逆冲兼左旋走滑。玉树地震除了造成大量房屋破坏外,次生地质灾害主要包括:地震砂土液化及其引起的公路变形、地震滑坡、地震诱发水渠破坏及其链生土质滑坡和泥石流等。通过对内外动力地质灾害的综合分析,初步提出了玉树地震灾区灾后重建避让选址的建议。

    Abstract:

    The Yushu Ms 7.1 earthquake was happened at 7:49:40.7 on April 14, 2010 in Yushu county of Qinghai province. Field investigation and analysis indicate that the Yushu segment of GanziYushu fault is the earthquake causing fault. The total rupture length caused by the Yushu earthquake is 23 km with a strike direction of NWWNW. The rupture is mainly characterized by leftlateral slipping, which can be further divided into three segments. The west segment is a continuous leftlateral slipping rupture, near the site, named Guoyangyansongduo, of Longbao town (33°03′11″N, 96°51′26″E), the horizontal offsets of the rupture is 1.75m, which is the largest amount measured, so the authors regard this area is the macroscopical epicenter. The middle segment is mainly located at the south of the city town, and composed by several rightstep subruptures. The east segment is mainly characterized by thrusting associated with leftlateral strikeslipping. Besides a large amount of house ruining, the Yushu earthquake has caused a series of secondary geohazards, such as sand soil liquefaction and related road deformation, earthquakeinduced landslides, aqueduct damaged by the earthquake and related soil landslide and mudflow, etc. After comprehensive analysis of the endogenic and exogenic geohazards, proposals have been given forth for fault avoidance and reconstruction site selection in the Yushu earthquake stroked area.

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张永双,马寅生,胡道功,杨农,熊探宇,郭长宝.2010.玉树地震地表破裂调查与灾后重建避让选址研究[J].地质学报,84(5):593-605.
ZHANG Yongshuang, MA Yinsheng, HU Daogong, YANG Nong, XIONG Tanyu, GUO Changbao.2010. Investigation and Research on the Surface Rupture of the Yushu Earthquake and Reconstruction Site Selection[J]. Acta Geologica Sinica,84(5):593-605.

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  • 收稿日期:2010-04-26
  • 最后修改日期:2010-04-29
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