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甘肃省地震灾害时空分布特征研究

DOI: 10.13577/j.jnd.2015.0309, PP. 67-75

Keywords: 甘肃省,地震灾害,时空分布,人员伤亡

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Abstract:

基于GIS平台对甘肃省历史地震灾害进行了时空分布特征分析,以期为甘肃省地震灾害评估、应急救援工作提供科学依据。研究结果表明:(1)甘肃省历史上发生过强烈地震(M≥4.75)188次,地震灾害在空间上分布于59个区县,遍布甘肃省13个地市(除金昌市),全省地震灾害无显著的空间分异格局;(2)甘肃省在大地震灾害影响程度上存在显著的差异,根据区域差异大致可将甘肃省划分为2个区域:河西和河东地区。河西地区的地震灾害震中烈度比同震级的河东地区地震小,地震灾害影响范围也较小;(3)区域地震活动呈现周期性的起伏变化,其中1917-1936年为甘肃省近百年来地震活动最为频繁的阶段,发生过3次特别重大地震灾害(M≥7.0),目前甘肃省正处于另一个地震活跃期;(4)地震灾害人员伤亡存在地区差异,同震级地震河东地区人员伤亡较河西地区严重。甘肃省农村人口比重偏大,地震灾害比其他经济发达省份更为严重。

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