| 断裂带两侧地震诱发滑坡空间分布差异性的主要影响因素研究——以北川地区的地震滑坡分布为例 |
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| 引用本文： | 陈晓利,李传友,王明明,李正芳.断裂带两侧地震诱发滑坡空间分布差异性的主要影响因素研究——以北川地区的地震滑坡分布为例[J].地球物理学报,2011,54(3):737-746. |
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| 作者姓名： | 陈晓利 李传友 王明明 李正芳 |
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| 作者单位： | 中国地震局地质研究所, 北京 100029 |
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| 基金项目： | 中国地震局地质研究所基本科研业务，工信部国家科技重大专项课题，国家地质灾害防治专项科研项目 |
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| 摘 要： | 目前在地震滑坡影响因素的研究中,一般认为岩性、地形地貌、坡度、地震烈度、震中距等因素对滑坡的空间分布有重要的影响作用,忽视了发震断裂的运动方式对滑坡分布所起作用.5.12汶川地震诱发的大量滑坡崩塌灾害主要沿龙门山断裂带发育,但在断裂带两侧呈不对称分布,80%以上的滑坡、特大型滑坡主要分布于断裂带的上盘.这一现象在汶川地...
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| 关 键 词： | 地震滑坡 空间分布 影响因素 断裂运动方式 |
| 收稿时间： | 2010-10-12 |
The main factors causing the seismic landslide distribution difference on two sides of the faults——A case study of landslide distribution in Beichuan area |
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| CHEN Xiao-Li,LI Chuan-You,WANG Ming-Ming,LI Zheng-Fang.The main factors causing the seismic landslide distribution difference on two sides of the faults——A case study of landslide distribution in Beichuan area[J].Chinese Journal of Geophysics,2011,54(3):737-746. |
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| Authors: | CHEN Xiao-Li LI Chuan-You WANG Ming-Ming LI Zheng-Fang |
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| Institution: | Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | It is generally believed that rock properties, topography, slope degree, seismic intensity, epicentral distance etc. have a main influence on the spatial distribution of seismic landslides ignoring the influence of the seismic fault mechanics. Landslides triggered by 5.12 Wenchuan Great Earthquake mainly occurred along the Longmenshan Fault Zone, but they were distributed asymmetrically on the uplift side and foot side. More than 80% of the total landslides and almost all the huge landslides are located at the uplifted side of the faults. This phenomenon is more evident in Beichuan area where it is one of the most damaged areas during Wenchuan Great Earthquake. Based on GIS technology, this paper analyzed landslides distribution characteristics of the study area, and as well landform elevation, slope degree, rock property, aftershock distribution, surface deformation, seismic peak ground acceleration of both the uplift and foot sides. Moreover, it discusses the key influencing factors that caused the landslide distribution difference between the uplift and foot sides of the faults. The results show that in the study area landslides concentrated within 5km from the fault rupture zone, and there are significant differences in number and distribution area of the landslides between the uplift side and foot side. The distribution area of the landslides at the uplift side is more than 8 times that at foot side. Landslides are prone to occur in areas with elevation lower than 1500m and slope degree 25~40. Both uplift and foot sides have equivalent proportion of such area, but the number of landslides at the uplift side is far more than that at foot side. In the area with same slope degree, landslides at uplift side are more than 3 times that at foot side. Most landslides developed in the Cambrian and Sinian strata close to the rupture zone at the uplift side. Because Wenchuan Great Earthquake was caused by thrust faults, aftershocks and large deformation occurred at the uplift side. Also, the seismic peak ground acceleration attenuates more slowly at uplift side than foot side. It is concluded that the main influencing factors caused the obvious difference of the landslides distribution should be contributed to the mechanics of the seismic fault, not the landform elevation, slope degree and rock type. |
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| Keywords: | Earthquake-triggered landslide Landslide distribution Influencing factors Fault mechanics |
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