玉树地震地表破裂与宏观震中

马寅生; 张永双; 胡道功; 杨农; 龙长兴; 侯春堂; 闫鹏; 吴中海; 杨振宇; 雷伟志; 谭成轩

玉树地震地表破裂与宏观震中

马寅生^{1, 2,},
张永双^{1, 2},
胡道功^{1, 2},
杨农^{1, 2},
龙长兴^{1, 2},
侯春堂²,
闫鹏²,
吴中海²,
杨振宇^{1, 2},
雷伟志²,
谭成轩^{1, 2}

1.
国土资源部新构造运动与地质灾害重点实验室, 北京 100081
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

国家重点基础研究发展计划“973”项目 2008CB425702

详细信息

作者简介:
马寅生(1962-), 男, 研究员, 主要从事新构造、活动构造、地应力和区域稳定性等方向。通信地址:北京市海淀区民族大学南路11号。邮编: 100081。E-mail: mayinsheng@sohu.com

中图分类号: P315.2
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- 文章访问数: 322
- HTML全文浏览量: 180
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2010-05-14
- 刊出日期: 2010-06-01

THE SURFACE RUPTURES AND THE MACROSCOPICAL EPICENTER OF YUSHU M_S7.1 EARTHQUAKE

MA Yin-sheng^{1, 2
,},
ZHANG Yong-shuang^{1, 2},
HU Dao-gong^{1, 2},
YANG Nong^{1, 2},
LONG Chang-xing^{1, 2},
HOU Cun-tang²,
YAN Peng²,
WU Zhong-hai²,
YANG Zhen-yu^{1, 2},
LEI Wen-zhi²,
TAN Cheng-xuan^{1, 2}

1.
Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing 100081, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 10081, China

摘要

摘要: 2010年4月14日07时49分40.7秒, 青海省玉树藏族自治州玉树县发生M_S7.1级地震。通过现场调查发现, 玉树地震形成了东西两条地表破裂带——玉树地表破裂带和隆宝滩地表破裂带, 分别沿玉树活动断裂、隆宝滩活动断裂的上盘发育, 两条地表破裂带均呈NW向延伸, 二者之间相距22km。隆宝滩地表破裂带, 总体走向290°, 长21.5km, 呈左旋走滑运动, 左旋走滑位移量约1m。玉树地表破裂带, 总体走向310°, 长度23km, 可进一步分为三段。西段和中段表现为左旋走滑, 东段表现为左旋走滑逆冲运动。最大左旋走滑位移量在郭央烟宋多附近, 达2.4m。根据地震地表破裂的位移量大小和建筑物破坏情况认为, 玉树地震宏观震中在郭央烟宋多附近, 宏观震中坐标为:北纬33°03′11″、东经96°51′26″。
- 玉树地震 /
- 活动断裂 /
- 地震断裂
Abstract: At 7:49:40.7 on April 14, 2010, a M_S 7.1 earthquake happened in Yushu County of Qinghai Province. In the field investigation two surface rupture zones were observed from west to east, Longbaotan surface rupture zone and Yushu surface rupture zone. They display NW trending and are respectively developed along hang wall of the Longbaotan active fault and Yushu active fault at an interval of 22km. The Longbaotan surface rupture zone, trending along 290° with a length of 21.5km, was sinistral strike-slip movement with a sinistral strike-slip displacement of about 1m. The Yushu surface rupture zone, trending 310° with a length of 23km, can be further divided into three sections. It shows sinistral strike-slip movement in western and middle segment, sinistral strike-slip and thrust in eastern segment. The maximum sinistral strike-slip displacement (2.4m) of the rupture zones appears near the Guoyangyansongduo. According to the displacement of the earthquake surface rupture and building destruction, the earthquake macroscopical epicenter can be considered in the Guoyangyansongduo near the macroscopical epicenter coordinates: at 33°03′11″N and 96°51′26″E.
- Yushu earthquake /
- active fault /
- seismic fault

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图 1 玉树地震震中(红圈)和主要构造单元(红线为主要活动断裂)

Figure 1. A map showing Yushu earthquake focus and main tectonic unites

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图 2 甘孜-玉树断裂带最新地表活动形迹平面图

(据周荣军等, 1997)^[20]

Figure 2. A map showing Ganzi-Yushu active fault zone

(after Zhou Rongjun, 1997)

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图 3 玉树活动断裂断层三角面及左旋错断冲沟

Figure 3. The triangular facets of Yushu active fault and sinistral cutting gullys

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图版 1 玉树活动断裂特征与地震地表破裂

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图 4 玉树地震地表破裂平面分布图

Ⅰ-玉树地表破裂带东段; Ⅱ-玉树地表破裂带中段; Ⅲ-玉树地表破裂带西段; Ⅳ-隆宝滩地表破裂带

Figure 4. A map showing distribution of Yushu earthquake surface ruptures

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图版 2 玉树地震破裂带西段地质特征

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图版 3 玉树地表破裂带西段地质特征

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图 5 玉树地震地表破裂中段特征

Figure 5. Characteristics of the middle segment of Yushu earthquake ruptures

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图版 4 玉树地震破裂中段主要特征

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图版 5 玉树地震破裂东段主要特征

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