浅层人工地震探测在八钢—石化隐伏断裂中的应用
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摘要
以八钢—石化隐伏断裂为例,介绍了在乌鲁木齐地区第四系较厚的河流相卵砾石覆盖层中利用浅层人工地震探测隐伏活动断裂的具体方法。首先进行观测系统参数的确定,其次实施多次覆盖的人工地震探测,从而获得较好的多层反射界面剖面,在此基础上结合相关资料进行地质解译,最后通过钻孔联合剖面验证。分析结果表明,八钢—石化隐伏断裂为隐伏的逆断层—背斜构造,宽度达150~300 m,主断层位于背斜北侧,有2条,为倾向S或SE的逆断层,错断了中更新统—上更新统砾石层,上盘形成背斜构造,在背斜南翼发育次级逆断层或正断层,主逆断层带的总垂直位移为21~23 m。
For example Bagang-Shihua hidden fault,we introduced the methods of using shallow artificial earthquakes to prospect hidden fault in the covery layer of fourth series river gravel in Urumqi region.Firstly,confirmed the parameters of observation system,secondly,actualized artificial seismic prospecting of mang times covery,this can let us obtain good multilayer reflecting profile,based on this,combined with relative datum to interpret the geology;in the end,used bore associated profile to test.The result shows,Bagang-Shihua hidden fault is hidden reverse fault-anticline structure,the breadth is from 150 km to 300 km,the two main faults lie in the northern side of anticline,they are reverse fault with S or SE direction dip,they pass middle pleistocene and upper pleistocene gravel layer,handing wall is anticiline structure,secondary reverse fault or positive fault develop in the sourthern side of anticline,the upright displacements between main reverse fault belt are from 21 km to 23 km.
For example Bagang-Shihua hidden fault,we introduced the methods of using shallow artificial earthquakes to prospect hidden fault in the covery layer of fourth series river gravel in Urumqi region.Firstly,confirmed the parameters of observation system,secondly,actualized artificial seismic prospecting of mang times covery,this can let us obtain good multilayer reflecting profile,based on this,combined with relative datum to interpret the geology;in the end,used bore associated profile to test.The result shows,Bagang-Shihua hidden fault is hidden reverse fault-anticline structure,the breadth is from 150 km to 300 km,the two main faults lie in the northern side of anticline,they are reverse fault with S or SE direction dip,they pass middle pleistocene and upper pleistocene gravel layer,handing wall is anticiline structure,secondary reverse fault or positive fault develop in the sourthern side of anticline,the upright displacements between main reverse fault belt are from 21 km to 23 km.
引文
①新疆防御自然灾害研究所.乌鲁木齐城市活断层探测与地震危险性评价项目之目标区活断层初查工作专题报告,2006.
[1]中国地震局.JSGC-04中国地震活动断层探测技术系统技术规程[S].北京:地震出版社,2005.
[2]朱金芳,徐锡伟,黄宗林,等.福州市活断层探测与地震危险性评价[M].北京:科学出版社,2005:39-82.
[3]柴炽章,孟广魁,杜鹏,等.隐伏活动断层的多层次综合探测——以银川隐伏活动断层为例[J].地震地质,2006,28(4):536-545.
[4]何正勤,叶太兰,丁志峰,等.城市活断层探测中的浅层地震勘探方法[M].北京:地震出版社,2001.
[5]刘保金,张先康,方盛明,等.城市活断层探测的高分辨率浅层地震数据采集技术[J].地震地质,2002,24(4):524-531.
[6]宋正娜,沈军,赵纯青,等.乌鲁木齐市北郊碗窑沟断裂超浅层地震探测初步研究[J].西北地震学报,2006,28(2):172-179.
[7]中国地震局.DB/T15-2005浅层地震勘察技术规范[S].北京:地震出版社,1997.
[1]中国地震局.JSGC-04中国地震活动断层探测技术系统技术规程[S].北京:地震出版社,2005.
[2]朱金芳,徐锡伟,黄宗林,等.福州市活断层探测与地震危险性评价[M].北京:科学出版社,2005:39-82.
[3]柴炽章,孟广魁,杜鹏,等.隐伏活动断层的多层次综合探测——以银川隐伏活动断层为例[J].地震地质,2006,28(4):536-545.
[4]何正勤,叶太兰,丁志峰,等.城市活断层探测中的浅层地震勘探方法[M].北京:地震出版社,2001.
[5]刘保金,张先康,方盛明,等.城市活断层探测的高分辨率浅层地震数据采集技术[J].地震地质,2002,24(4):524-531.
[6]宋正娜,沈军,赵纯青,等.乌鲁木齐市北郊碗窑沟断裂超浅层地震探测初步研究[J].西北地震学报,2006,28(2):172-179.
[7]中国地震局.DB/T15-2005浅层地震勘察技术规范[S].北京:地震出版社,1997.
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