渭河断裂咸阳吴家堡附近浅部特征研究
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摘要
为了准确掌握渭河断裂在咸阳吴家堡附近的浅部特征,根据研究区自然条件和城市道路、居民点分布等实际,采用现场钻探为主,地震勘探为辅,二者相结合的方法,对渭河断裂在场区内的分布位置、形态特征、类型及活动性进行探查和分析评价。研究结果显示吴家堡附近渭河断裂面南倾,倾角约50°～65°,为一张性正断层。断面浅部垂向错动距离约30 m,推算错动的平均速率为0.17 mm/a。
In order to accurately master the shallow features of the Weihe fault in the vicinity of Xianyang wujiabao,according to the natural conditions,urban road and residential distribution of the research area,both methods of the spot drilling and seismic exploration are adopt,in which mainly using the former,assisted by the latter,to do exploration,analyses and evaluation of the Weihe fault in the field area's distribution,morphological characteristics,types and activity.The research result indicates that the Weihe fault surface which is close to the Wujiabao tilts to the south,the dip angle is about 50°~65°,which is a extension normal fault.Fracture surface's superficial part's vertical dislocation distance is about 30 m,calculating the dislocation's average velocity is 0.17 mm/a.
In order to accurately master the shallow features of the Weihe fault in the vicinity of Xianyang wujiabao,according to the natural conditions,urban road and residential distribution of the research area,both methods of the spot drilling and seismic exploration are adopt,in which mainly using the former,assisted by the latter,to do exploration,analyses and evaluation of the Weihe fault in the field area's distribution,morphological characteristics,types and activity.The research result indicates that the Weihe fault surface which is close to the Wujiabao tilts to the south,the dip angle is about 50°~65°,which is a extension normal fault.Fracture surface's superficial part's vertical dislocation distance is about 30 m,calculating the dislocation's average velocity is 0.17 mm/a.
引文
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2冯希杰,田勤俭,申旭辉.渭河断裂西段活动差异性分析.地质论评,2003;49(3):233—237
3张秀香,王秀生.渭河盆地隐伏断层的视电阻率特征.西北地震学报,1997;19(2):77—79
4谢振乾,杨建军,郑宁平.论渭河盆地断块运动及地震活动特征.陕西地质,2010;28(2):60—61
5方永安.陕西地震活动规律与活动断裂的关系.陕西地质,1997;15(1):72—83
6冯希杰,戴王强,董星宏.从陕西省扶风县古水路堑剖面剖析渭河断裂第四纪活动.中国地震,2003;19(2):188—193
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