许冲, 徐锡伟, 郑文俊. 2013: 2013年7月22日岷县漳县MS6.6级地震滑坡编录与空间分布规律分析. 工程地质学报, 21(5): 736-749.
    引用本文: 许冲, 徐锡伟, 郑文俊. 2013: 2013年7月22日岷县漳县MS6.6级地震滑坡编录与空间分布规律分析. 工程地质学报, 21(5): 736-749.
    XU Chong, XU Xiwei, ZHENG Wenjun. 2013: COMPILING INVENTORY OF LANDSLIDES TRIGGERED BY MINXIAN-ZHANGXIAN EARTHQUAKE OF JULY 22, 2013 AND THEIR SPATIAL DISTRIBUTION ANALYSIS. JOURNAL OF ENGINEERING GEOLOGY, 21(5): 736-749.
    Citation: XU Chong, XU Xiwei, ZHENG Wenjun. 2013: COMPILING INVENTORY OF LANDSLIDES TRIGGERED BY MINXIAN-ZHANGXIAN EARTHQUAKE OF JULY 22, 2013 AND THEIR SPATIAL DISTRIBUTION ANALYSIS. JOURNAL OF ENGINEERING GEOLOGY, 21(5): 736-749.

    2013年7月22日岷县漳县MS6.6级地震滑坡编录与空间分布规律分析

    COMPILING INVENTORY OF LANDSLIDES TRIGGERED BY MINXIAN-ZHANGXIAN EARTHQUAKE OF JULY 22, 2013 AND THEIR SPATIAL DISTRIBUTION ANALYSIS

    • 摘要: 2013年7月22日,中国甘肃省岷县漳县交界地区发生MS6.6级地震。地震触发了大量的滑坡,主要类型为小型的黄土崖崩、滑、倾,还有一些深层连贯型滑坡、大型土质流滑、侧向滑移等地震滑坡类型。本文主要基于地震滑坡野外考察与高分辨卫星影像人工目视解译方法,开展本次地震触发滑坡的编录图制作工作,并基于编录成果开展地震滑坡空间分布规律分析工作。滑坡编录结果表明此次地震至少触发了2330处滑坡。基于GIS平台下开展了地震滑坡与地形控制因子、地质控制因子与地震控制因子的关系统计。结果表明岷县漳县地震滑坡受地形因子的控制作用较小; 受地层岩性的控制作用较大。其中1401处滑坡(占总滑坡的60.13%)分布在下伏基岩为古近系下统地层(Eb)砾岩与砂岩的区域内,其中滑坡密度是所有地层分类中最高的,达到22.78个km-2。地震滑坡与PGA的统计关系并不明显。地震滑坡主要集中在一个与发震断层走向一致的长条形区域内,长约14km,宽约5km。该区域内滑坡数量为1864个,占所有滑坡数量的80%,表明了岷县漳县地震滑坡空间分布的密集特征。文章获得的基于地震事件的区域滑坡编录成果是后续地震滑坡相关科学研究的重要基础与核心数据; 空间分布规律分析成果可为地震区滑坡与泥石流防灾减灾提供科学参考。

       

      Abstract: On July 22, 2013,an earthquake of MS 6.6 occurred at the border area between Minxian and Zhangxian Counties, Gansu Province. The earthquake triggered many landslides of various types. The mainly types are small-scale falls, slides, and topples that occurred on loess scarps. There were also some deep-seated landslides, large-scale soil avalanches, and soil lateral spreads. In this paper, an inventory of landslides triggered by the earthquake is compiled based on partial field investigations and visual interpretation of high-resolution satellite images. Subsequently landslides spatial distribution analysis is also developed. It is indicated that the earthquake at least triggered 2330 landslides. Correlations of landslides with topographic, geological, and earthquake factors are developed on GIS platform. It is shown that the landslides were less affected by topographic factors but were more controlled by strata and lithology. Among of the 2330 landslides, 1401 landslides, occupied 60.13% of the total number with a maximum value of landslide number density of 22.78 landslides/km2,were occurred in areas of underlying bedrock of conglomerate and sandstone of Lower Permian strata of Paleogene(Eb). Correlation of PGA with landslides number density was obscure. Most of the landslides were concentrated in an elongated region, with 14km length and 5km width, parallel with seismogenic fault. A total of 1864 landslides, occupied 80% of the total landslide number, were occurred in the region. This indicates the landslides triggered by the earthquake were occurred close together. The event-based inventory of earthquake-triggered regional landslides in this article is an essential and core data for subsequent studies on earthquake-triggered landslides. Spatial distribution analysis of the landslides can provide scientific references for follow-up landslides and debris flow mitigation in earthquake struck area.

       

    /

    返回文章
    返回