四川汶川Ms 8 级地震触发的典型滑坡的风险指标反演
Risk indexes inversion of typical landslide triggered by the Ms 8.0 Wenchuan earthquake, Sichuan, China
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摘要: 2008年汶川大地震触发了数以万计的崩塌和滑坡，特别是沿发震断裂分布一系列大型的高速远程滑坡。为了探索地震诱发大型高速远程滑坡运动速度的反演方法，以汶川大地震典型高速远程滑坡为例，在野外调查和室内分析的基础上，结合前人的研究成果，对沿映秀－北川断裂展布的5个典型滑坡的速度进行了反演和计算。结果表明，5个滑坡的最大速度均大于50m/s，其中大光包滑坡速度最大，其下部滑体的最大速度约为300m/s，上部滑体凌空飞行的初速度高达165.6 m/s。同时，对上述滑坡的视摩擦系数进行了计算，4个滑坡的视摩擦系数介于0.16~0.4之间。这一研究的目的在于为类似地区地震滑坡的速度、最大位移量的预测和风险评估提供基础数据，对于类似地区的防灾减灾具有一定的参考价值。
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关键词:
- 汶川大地震典型地震滑坡 /
- 滑坡的速度 /
- 视摩擦系数
Abstract: The Ms 8.0 Wenchuan earthquake on May 12, 2008 has triggered thousands of landslides, and many high velocity landslides with long distance are distributed along active faults. In order to study on the inversion method and risk evaluation indices of landslide velocity, taking typical high velocity landslides with long distance triggered by Wenchuan earthquake as example, based on field investigation and in-door analysis, referring to previous achievements. This paper has inversed and calculated the velocities of five landslides along Beichuan-Yingxiu faults, it′s indicated that the maximum velocity is above 50m/s, while the lower part of Daguangba landslide can be as high as 300m/s, the initial velocity of higher part reached as high as 165.6 m/s. Meanwhile, the regarded friction coefficients of five landslides are also obtained in between 0.16 and 0.4. With the purpose of providing fundamental data for prediction and risk evaluation of velocity, maximum distance of similar earthquake triggered landslides, this paper can be referable for disaster prevention and mitigation. -
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