汶川地震映秀镇地质条件与地表破裂特征调查
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摘要
2008年5月12日14时28分04秒,四川省汶川县发生了MS 8.0地震。根据地震部门测定,本次地震是从映秀开始破裂,震中位于四川汶川县映秀镇附近(北纬31.015°,东经103.365°)。在中国地震局组织的汶川地震科学考察成果基础上,本文分析了映秀地质条件:主要发育的地层为二叠系的石英闪长岩,震旦系的砂岩;通过研究区的主要构造为龙门山中央断裂—映秀-北川断裂;主要的地貌类型为河流地貌。调查了研究区的地表破裂特征,根据研究区的地貌类型将其划分为A、B、C三段,A段为河床沉积地貌,垂直断距最大;B段为丘陵地貌,断距中等,但诱发崩塌地质灾害;C段为河流边滩地貌,断距较小,但震害严重。
0n May 12,2008,an earthquake of magnitude 8.0 occurred in Wenchuan,Sichuan Province,China.The epicenter was located in Yingxiu Town(N 31.015°,E 103.365°).The paper analyses the condition of landform-geology and the characters of surface rupture,depending on the data of the Wenchuan earthquake survey.The stratum layers are black granite of Permian period and sandstone of Simian period;the fracture zone is Yingxiu-Beichuan fault,with river geomorphy.According to the types of geomorphy,we divide three-stage surface rupture.The stage A is river bed deposit and has the largest separation;the stage B is hilly geomorphy and has the middle separation;the stage C is marginal bank deposit and has the shortest separation,but there are serious damages,in this stage.
0n May 12,2008,an earthquake of magnitude 8.0 occurred in Wenchuan,Sichuan Province,China.The epicenter was located in Yingxiu Town(N 31.015°,E 103.365°).The paper analyses the condition of landform-geology and the characters of surface rupture,depending on the data of the Wenchuan earthquake survey.The stratum layers are black granite of Permian period and sandstone of Simian period;the fracture zone is Yingxiu-Beichuan fault,with river geomorphy.According to the types of geomorphy,we divide three-stage surface rupture.The stage A is river bed deposit and has the largest separation;the stage B is hilly geomorphy and has the middle separation;the stage C is marginal bank deposit and has the shortest separation,but there are serious damages,in this stage.
引文
[1]陈桂华,徐锡伟,郑荣章,等.年汶川MS8.0地震地表破裂变形定量分析[J].地震地质.2008,30(3):724-738.
[2]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):12-15.
[3]孙柏涛,闫培雷,胡春峰,等.汶川8.O级大地震极重灾区映秀镇不同建筑结构震害概述及原因简析[J].地震工程与工程振动,2008,28(5):2-9.
[4]薄景山,李秀领,刘红帅.土层结构对地表加速度峰值的影响[J].地震工程与工程振动.2003,23(3):36-40.
[2]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):12-15.
[3]孙柏涛,闫培雷,胡春峰,等.汶川8.O级大地震极重灾区映秀镇不同建筑结构震害概述及原因简析[J].地震工程与工程振动,2008,28(5):2-9.
[4]薄景山,李秀领,刘红帅.土层结构对地表加速度峰值的影响[J].地震工程与工程振动.2003,23(3):36-40.
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