渭河断裂西安段的展布及其结构特征
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摘要
地震深反射、高分辨率折射和浅层人工地震探测结果表明,渭河北岸断裂由两条断层组成:一条为窑店—张家湾断层,另一条为船张—咀头断层.窑店—张家湾断层从陈家沟,经窑店镇、前排村、庇李村、吴家村、张家湾到贾家滩,长约22 km,基本呈东西走向;船张—咀头断层从船张,经马北到咀头,长约15 km,近东西走向.渭河断裂为基底和上地壳断裂,错断了T_Q、T_N、T_E和T_g反射层,深约15 km.在深部渭河断裂与次级断层形成"Y"字型构造或同向低角度相交.渭河断裂为铲形正断层.该断裂深度在1000 m以浅,具有明显的逆牵引正断层和正牵引正断层的结构特性,并具有同生沉积的特点.渭河断裂是控制盆地沉积的断裂之一,是西安凹陷与咸阳凸起的分界断裂.该断裂从西向东深度逐渐减小,深部在渭河、泾河和灞河三河交汇区与临潼—长安断裂相交,浅部与渭南—泾阳断裂相连.地震探测结果同时表明,渭河南岸断裂不存在.
Results of seismic deep reflection,high resolution refraction and shal- low artificial seismic exploration indicate that the fault on the northern bank of the Weihe river is composed of two branches:one is the Yaodian-Zhangjiawan fault and the other is the Chuanzhang-Zuitou fault.The 22 km long Yaodian- Zhangjiawan fault of E-W strike starts from Chenjiagou,via Yaodian town, Qianpai village,Bill village,Wujia town and Zhangjiawan,to Jiajiatan.The 15 km long Chuanzhang-Zuitou fault striking near E-W starts from Chuanzhang, via Mabel,to Zuitou.The Weihe fault is a basement and upper crust fault and the reflection layers of T_Q,T_N,T_E and T_g are ruptured at depth of about 15 km.In deep part the Weihe fault and the secondary fault form a Y-shaped struc- ture or a synthetic low angle intersection.The Weihe fault is a listric normal fault,which has obvious structural characteristics of a reverse-drag normal fault and a normal-drag normal fault within a depth of 1000 m,and also has the char- acteristics of syngenetic sediment.The Weihe fault is one of the faults which control the basin sediment,and is the boundary fault between Xi'an depression and Xianyang salient.The fault depth decreases gradually from west to east.Its deep part intersects with the Lintong-Chang'an fault at the intersection of Weihe River,Jing River and Bahe River,and its shallow part connects with the Weinan-Jingyang fault.The seismic exploration result indicates that no fault exists on southern bank of the Weihe River.
引文
①国家地质总局第三普查大队.1977.汾渭盆地石油普查阶段地质成果报告.
    ②陕西省地质矿产局.1990.西安地区区域地壳稳定性与地质灾害评价和研究.
    ①,②西安市活断层探测与地震危险性评价项目深地震探测工作报告.2005.中国地震局地球物理勘探中心.
    ①西安市活断层探测与地震危险性评价项目深地震探测工作报告.2005.中国地震局地球物理勘探中心.
    ①中国地质科学院地球物理地球化学勘查研究所,国家现代地质勘查工程技术研究中心.2005.西安市地震活断层探测与地震危险性分析浅层人工地震控制性探测报告.
    ①煤炭科学研究总院西安分院.2005.西安市地震活断层探测与地震危险性评价浅层人工地震控制性探测报告.
    ②煤炭科学研究总院西安分院.2007.西安市地震活断层探测与地震危险性评价浅层人工地震详细探测报告.
    ①陕西省工程地震勘察研究院.2007.西安市地震活断层探测与地震危险性评价钻孔地质报告.
    ②中国地震局地质研究所.2007.西安市地震活断层探测与地震危险性评价渭河盆地晚第四纪地层剖面的建立.
    方盛明,张先康,刘宝金,段永红,徐锡伟,张永超.2006.城市活断层地震勘探的最佳组合方法与应用研究[J].地震地质,28(4):646-653.
    冯希杰.戴王强,董星宏.2003a.从陕西省扶风县古水路堑剖面剖析渭河断裂第四纪活动[J].中国地震,19(2):188- 193.
    冯希杰,田勤俭.申旭辉.2003b.渭河断裂西段活动差异性分析[J].地质论评,49(3):233-238.
    冯希杰.戴王强.2004.渭河盆地断层活动的横向迁移[J].地震学报,26(2):174-182.
    冯希杰.李晓妮.任隽,师亚芹,戴王强,王夫运,苗康运,韩恒悦.2008.渭河断裂深、中、浅和近地表显示[J].地震地质,30(1):264-271.
    彭建兵.1992.渭河断裂带的构造演化与地震活动[J].地震地质,14(2):113-119.
    师亚芹.李晋,冯希杰,戴王强.任隽,李晓妮,窦玛丽.2007.渭河断裂带古地震研究[J].地震地质,29(3):607- 616.
    西安市城市规划管理局.西安市勘察测绘院.1998.西安城市工程地质图集[M].西安:西安地图出版社:13.
    向宏发.2003.隐伏活动构造探测研究的若干问题讨论[J].地震地质,25(3):460-466.
    薛祥煦.李文厚,刘林玉.2002.渭河北迁与秦岭抬升[J].西北大学学报(自然科学版),32(5):451-453.
    严阵.1965.渭河谷地第四纪旋转大断裂[J].中国第四纪研究,4(2);117-118.

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