走滑断裂型地震诱发的滑坡在断裂两盘的空间分布差异

Spatial distribution difference of landslides triggered by slipping-fault type earthquake on two sides of the fault

以玉树地震滑坡为实例,选择高程、坡度、坡向、坡位、水系、地层岩性、同震地表破裂、地震动峰值加速度(PGA)8个因子,以地震滑坡面积百分比(LAP)与滑坡点密度(LND)为指标,研究走滑断裂型地震诱发滑坡在断裂两盘的空间分布差异。在分析这些影响因子的断裂两盘的差异的基础上,基于LAP与LND两个指标详细分析断裂两盘每个因子内部级别滑坡发育的情况。结果表明,总体上北盘的滑坡较南盘发育,除了个别因子级别内南北盘滑坡差别较大外,大部分表现为南北盘滑坡分布情况类似。总之,玉树地震滑坡在断裂两盘的空间分布基本类似,只是在某些因子分级内存在一定的差异。

Spatial distribution difference of landslides triggered by slipping-fault type earthquake on both sides of the fault was studied in this paper,with landslides triggered by 2010 Yushu earthquake as an example.Elevation,slope,aspect,slope position,drainages,lithology,co-seismic main surface fault-ruptures,and peak ground acceleration（PGA） were taken as eight earthquake triggered landslides impact factors,and landslide area percentage（LAP） and landslide number density（LND） were taken as comparable indices.Spatial distribution differences of the eight factors on two sides of the fault were analyzed firstly,and then LAP and LND in all ranks of each factor on two sides of the fault were compared with each other.The results show that more landslides occurred on the northern plate than on the southern plate.LAP and LND of the two plates are similar in each rank except for a few factor ranks.In summary,the spatial distribution of Yushu earthquake triggered landslides on the two plates was similar except for some difference in a few ranks of the eight impact factors.