许冲, 徐锡伟, 戴福初, 王彦颖. 2011: 2010年4月14日玉树地震滑坡空间分布与控制变量分析. 工程地质学报, 19(4): 505-510.
    引用本文: 许冲, 徐锡伟, 戴福初, 王彦颖. 2011: 2010年4月14日玉树地震滑坡空间分布与控制变量分析. 工程地质学报, 19(4): 505-510.
    XU Chong, XU Xiwei, DAI Fuchu, WANG Yanying. 2011: ANALYSIS OF SPATIAL DISTRIBUTION AND CONTROLLING PARAMETERS OF LANDSLIDES TRIGGERED BY THE APRIL 14, 2010 YUSHU EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 19(4): 505-510.
    Citation: XU Chong, XU Xiwei, DAI Fuchu, WANG Yanying. 2011: ANALYSIS OF SPATIAL DISTRIBUTION AND CONTROLLING PARAMETERS OF LANDSLIDES TRIGGERED BY THE APRIL 14, 2010 YUSHU EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 19(4): 505-510.

    2010年4月14日玉树地震滑坡空间分布与控制变量分析

    ANALYSIS OF SPATIAL DISTRIBUTION AND CONTROLLING PARAMETERS OF LANDSLIDES TRIGGERED BY THE APRIL 14, 2010 YUSHU EARTHQUAKE

    • 摘要: 2010年4月14日07时49分,青藏高原中部,青海省玉树县发生了Ms7.1级大地震(玉树地震)。震后遥感影像目视解译与实地调查结果表明,本次地震触发了2036处滑坡,总面积约1.194km2,这些滑坡大概分布在一个面积约1455.3km2的矩形区域内。本文分别使用滑坡数量与滑坡面积这2个标准,对玉树地震滑坡的地震控制变量(震中距、宏观震中距、与地表破裂距离、PGA)、地形控制变量(高程、坡度、坡向、坡位、与水系距离)、公路控制变量(与公路距离)共3大类、10小类地震滑坡控制变量进行统计分析研究。结果表明:(1)玉树地震滑坡受地表破裂的控制作用强烈,滑坡多发生在距离地表破裂1.5km的区域内,宏观震中距对滑坡也有一定的影响作用,滑坡多分布在距宏观震中22km的区域内,而震中距与PGA对滑坡的控制作用不明显; (2)地形因子方面,滑坡多发生在高程为3800~4000m与4200~4600m的范围,坡度20~35的范围,NE、E坡向,中坡与下坡位,滑坡随着与水系距离的增加而减少,多发生在距离水系200m的区域内; (3)距离公路越近,滑坡越发育,滑坡多发生在距离公路300m的范围内。

       

      Abstract: On April 14, 2010at 07: 49(Beijing time),a catastrophic earthquake with Ms 7.1 occurred beneath the central of the Tibetan Plateau in Qinghai,China.With visual interpretation of remote sensing imageriesand verifications of field check,about 2036 landslides are found in a total area of 1.194 square kilometers.They are triggered by the ground motion of the earthquake.They are extensively mapped over a rectangle landslide limit area of about 1455.3 square kilometers.Using both landslide area(LA)and landslide number(LN)to carry out statistical analysis on 3 categories of controlling parameters for landslides triggered by earthquake: 1)earthquake parameters(distance from earthquake epicenter,distance from macroscopical epicenter,distance from the main surface rupture,and PGA), 2)topographic parameters(elevation,slope angle,slope aspect,topographic position,distance from drainages),and 3)road parameters(distance from roads).The results are as follows: ① both LA and LN have strong positive correlations with distance from main surface rupture,landslides often occurred at a distance of 1.5km from the main surface rupture.Macroscopical epicenter also has some influence on the landslide distribution.The region about at a distance of 22km from the macroscopical epicenter is landslide intensive region.Both distance from earthquake epicenter and PGA have no obvious effect on the earthquake triggered landslides; ② most of the Yushu earthquake triggered landslide occurred in the areas about the following topographic controlling parameters,elevation as 3800~4000m and 4200~4600m,slope angle as 20~35,slope aspect as NE and E,topographic position as middle slope and lower slope are landslide.Landslides have strong positive correlations with distance from drainages; ③ the closer to the roads,landslide more occurring.Most of the landslides occurred within 300m from the roads.

       

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