鲜水河断裂带全新世活动性研究进展综述

熊探宇; 姚鑫; 张永双

鲜水河断裂带全新世活动性研究进展综述

熊探宇^{1, 2,},
姚鑫^{1, 2},
张永双^{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:

中国地质调查局国土资源大调查项目 1212010914025

中国地质调查局国土资源大调查项目 1212011014035

详细信息

作者简介:
熊探宇(1985-), 男, 博士研究生, 地质工程专业。E-mail: xiongtanyu@126.com

中图分类号: P642
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- 文章访问数: 291
- HTML全文浏览量: 101
- PDF下载量: 44
- 被引次数: 0
出版历程
- 收稿日期: 2010-05-17
- 刊出日期: 2010-06-28

A REVIEW ON STUDY OF ACTIVITY OF XIANSHUIHE FAULT ZONE SINCE THE HOLOCENE

XIONG Tan-yu^{1, 2
,},
YAO Xin^{1, 2},
ZHANG Yong-shuang^{1, 2}

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

摘要

摘要: 鲜水河断裂带是中国西南山区一条现今活动强烈的大型地震断裂。本文在系统总结前人研究成果的基础上, 结合野外地质调查, 综述了鲜水河断裂带空间展布特征、活动性质及强度、历史地震地表破裂特征、地震危险性等方面的研究进展。前人研究结果表明, 鲜水河断裂带以惠远寺为界可分为两段, 进一步可细分为八段；断裂带全新世以来以左旋走滑为主, 兼具逆冲性质；整条断裂现今走滑活动速率约为10mm/a左右, 垂向变形在2mm/a以内；其中断裂带北西段活动速率为10~20mm/a, 南东段则小于10mm/a, 一般为5mm/a左右；断裂带地震活动频繁, 地震活动性北西段明显高于南东段, 强震迁移呈明显的跳跃式特征并具有原地复发性质；断裂带历史地震地表破裂特征与玉树地震所报道的地表破裂特征一致；断裂带地震危险性评价具很多不确定因素, 研究程度相对较低。
- 鲜水河断裂 /
- 活动速率 /
- 地震活动 /
- 地震危险性 /
- 地表破裂
Abstract: The Xianshuihe fault zone is a large active seismic-genetic zone in mountainous regions of southwest China. Based on previous studies, in combination with field investigation, the authors systemically summarized the research status about Holocene activity of Xianshuihe fault zone. The fault zone is divided by the Huiyuan Temple into two segments, the northwestern and southeastern segments, which are sub-divided into eight parts. Since the Holocene, the fault has occurred as a strike slip fault with thrust characteristic. The whole strike-slip generally displays an activity rate of about 10mm/a and a vertical deformation of 2mm/a or less. The activity rate is changeable in the fault, e.g., 10~20mm/a in the northwestern segment but smaller than 10mm/a in the southeastern segment. Accordingly the seismic activity is significantly stronger in the northwestern segment than in the southeastern segment. The earthquakes occurred with skip metastasis and have recurrent nature in situ. The surface rupture characteristics recorded in the historical earthquakes are consistent with those reported in the earthquake surface rupture. The research on seismic risk assessment along the Xianshuihe fault zone needs to be greatly improved.
- Xianshuihe fault zone /
- activity rate /
- seismic activity /
- seismic risk /
- surface rupture

HTML全文

图 1 广义的鲜水河断裂带空间展布图

(据文献[14]修改)

Figure 1. A sketch map showing distribution of generalized Xianshuihe fault zone

下载: 全尺寸图片幻灯片

图 2 鲜水河断裂带空间展布特征

(据文献[13])
1.活动断裂; 2.前第四纪活动断裂; 3.第四纪盆地; 4.燕山晚期花岗岩; 5.澄江-晋宁期斜长花岗岩; 6.断裂编号: ①炉霍断裂; ②道孚断裂; ③乾宁断裂; ④雅拉河断裂; ⑤中谷断裂; ⑥色拉哈-康定断裂; ⑦折多塘断裂; ⑧磨西断裂; 7. 7.0级及以上地震震中和时间

Figure 2. A sketch map showing stretch of the Xianshuihe active fault zone

下载: 全尺寸图片幻灯片

图 3 鲜水河断裂带强震M-T图

(据文献[35]修改)

Figure 3. A sketch map showing M-T of earthquakes(M≥5.0)in Xianshuihe active fault zone

下载: 全尺寸图片幻灯片

图 4 鲜水河断裂带M≥6地震时空关系图

(据文献[26]修改)

Figure 4. A map showing the tempo-spatial relationship of earthquakes(M≥6.0)in Xianshuihe fault zone

下载: 全尺寸图片幻灯片

图 5 鲜水河断裂带地貌特征

A-榆林乡南侧堰塞塘(NW); B-新榆林南侧石灰窑沟山脊左旋错动(NW); C–道孚南四十道班南东侧1981年道孚地震沟槽及鼓包地貌(SE); D-惠远寺北西侧沟槽地貌(SE); E-八美镇南侧构造石林地貌(E); F-松林口南东侧支沟左旋错动达290m(NE); G-道孚县恰叫村北1923年7.3级地震陡坎及鼓包(NW); H-折多山二台子道班南侧坡中槽地貌(SE)

Figure 5. A sketch map showing the geomorphology of Xianshuihe active fault zone

下载: 全尺寸图片幻灯片

图 6 甘孜-玉树断裂带玉树地震地表破裂特征

(据文献[45])
A-连续延伸的地震破裂(NW); B-右阶排列的地震地表破裂(NW); C-帐篷状构造(NW); D-地表破裂沿反向断坎发育(SE); E-禅古村逆冲走滑型断坎(SE); F-玉树县城区南部“X”型地裂缝(NE)

Figure 6. A sketch showing the surface rupture characteristics left in Yushu earthquake along Garzê-Yushu fault

下载: 全尺寸图片幻灯片

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