汶川、芦山和鲁甸地震滑坡分布规律对比研究

陈成 胡凯衡

陈成, 胡凯衡. 2017: 汶川、芦山和鲁甸地震滑坡分布规律对比研究. 工程地质学报, 25(3): 806-814. doi: 10.13544/j.cnki.jeg.2017.03.028
引用本文: 陈成, 胡凯衡. 2017: 汶川、芦山和鲁甸地震滑坡分布规律对比研究. 工程地质学报, 25(3): 806-814. doi: 10.13544/j.cnki.jeg.2017.03.028
CHEN Cheng, HU Kaiheng. 2017: COMPARISON OF DISTRIBUTION OF LANDSLIDES TRIGGERED BY WENCHUAN, LUSHAN, AND LUDIAN EARTHQUAKES. JOURNAL OF ENGINEERING GEOLOGY, 25(3): 806-814. doi: 10.13544/j.cnki.jeg.2017.03.028
Citation: CHEN Cheng, HU Kaiheng. 2017: COMPARISON OF DISTRIBUTION OF LANDSLIDES TRIGGERED BY WENCHUAN, LUSHAN, AND LUDIAN EARTHQUAKES. JOURNAL OF ENGINEERING GEOLOGY, 25(3): 806-814. doi: 10.13544/j.cnki.jeg.2017.03.028

汶川、芦山和鲁甸地震滑坡分布规律对比研究

doi: 10.13544/j.cnki.jeg.2017.03.028
基金项目: 

国家重点基础研究发展计划 2015CB452704

国家自然科学基金面上项目 41371039

中国科学院山地灾害与地表过程重点实验室开放基金资助

详细信息
    作者简介:

    陈成(1990-), 男, 硕士生.主要从事地震滑坡灾害研究.Email:501494037@qq.com

    通讯作者:

    胡凯衡(1975-), 男, 博士, 研究员.主要从事山地次生灾害减灾理论与技术研究.Email:khhu@imde.ac.cn

  • 中图分类号: P642.22

COMPARISON OF DISTRIBUTION OF LANDSLIDES TRIGGERED BY WENCHUAN, LUSHAN, AND LUDIAN EARTHQUAKES

  • 摘要: 汶川MS8.0级地震、芦山MS7.0级地震和鲁甸MS6.5级地震均引发了大量的滑坡灾害。由于震级差异和地质地形条件的不同,地震滑坡分布情况有较大区别。本文综合已有的研究成果,从地震、地质和地貌3个方面,对比分析了地震滑坡的分布规律。结果表明:(1)3次地震滑坡数量和密度随着PGA和震级的增加而增加。汶川和鲁甸地震随烈度的增加,滑坡数量呈现递增的趋势。但芦山地震在较低烈度区也发育着大量滑坡。(2)断层影响滑坡分布的最大距离随着震级的增加而增加。在最大影响距离0.2倍的范围内,汶川地震分布有80%的滑坡,而其他两次地震仅30%。此外,汶川地震滑坡数量随断层距离呈指数衰减关系。(3)地震滑坡的分布受到地形的强烈影响。Ⅶ度及以上烈度区地形切割深度越大,地震触发的滑坡集中分布区域相对高差越大。同时,滑坡集中发育的坡度会随之增加。切割深度越大,地震滑坡更易发生在地势较陡的山脊或者上坡处,这可能与地形放大效应有关。
  • 图  1  3次地震事件位置分布图

    Figure  1.  Locations of the three earthquakes events in China

    图  2  滑坡分布与PGA的关系

    a.数量;b.密度

    Figure  2.  Variations of the number(a) and density(b) of the earthquake-induced landslides along with PGA

    图  3  PGA相等时地震滑坡的数量分布

    Figure  3.  Distribution of the number of the earthquake-induced landslides at PGA=0.12g, 0.24g and 0.36g

    图  4  滑坡的分布与断层距离的关系

    Figure  4.  Variation of the number of the earthquake landslides along with the distance from fault

    图  5  汶川地震滑坡分布与断层距离的关系

    Figure  5.  Relationship between distribution of Wenchuan earthquake landslides and distance from fault

    图  6  地震滑坡分布与断层距离比例的关系

    Figure  6.  Relationship between distribution of earthquake landslides ratio and cumulative ratio of distance from fault

    图  7  滑坡的分布与岩性的关系

    Figure  7.  Relationship between distribution of earthquake landslides and lithology

    图  8  滑坡的分布与地形因子的关系

    a.高程;b.切割深度;c.坡度;d.坡向;e.坡位

    Figure  8.  Relationship between distribution of earthquake landslides and topographical parameters

    表  1  3次地震强震动记录的最大峰值PGA

    Table  1.   The maximum PGA of strong motion record in three earthquakes

    汶川地震芦山地震鲁甸地震
    PGA/cm·s-29571055.3948.5
    台站震中距/km22.29.74.4
    下载: 导出CSV

    表  2  3次地震烈度区面积及滑坡数量

    Table  2.   The area and landside number of different intensity region from three earthquakes

    烈度汶川地震芦山地震鲁甸地震
    面积
    /km2
    滑坡数量
    /个
    面积
    /km2
    滑坡数量
    /个
    面积
    /km2
    滑坡数量
    /个
    Ⅺ度区2419620470000
    Ⅹ度区3144579430000
    Ⅸ度区773838140208222790121
    Ⅷ度区27786342631418469529090
    Ⅶ度区84449508840296848158015
    Ⅵ度区314906013027175483900
    下载: 导出CSV

    表  3  岩石坚硬程度划分

    Table  3.   Categories of different rock hardness

    坚硬程度代表性岩石
    坚硬岩花岗岩、正长岩、闪长岩、辉绿岩、玄武岩、安山岩、片麻岩、硅质岩、板岩、石英岩等
    较坚硬岩熔结凝灰岩、大理岩、板岩、白云岩、石灰岩、钙质砂岩、粗晶大理岩等
    较软岩凝灰岩、千枚岩、砂质泥岩、泥灰岩、泥质砂岩、粉砂岩、砂质页岩等
    软岩泥岩、泥质页岩、绿泥石片岩、绢云母片岩等
    极软岩全风化、强风化的岩石
    下载: 导出CSV
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  • 收稿日期:  2016-07-23
  • 修回日期:  2017-03-16
  • 刊出日期:  2017-06-25

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