乌鲁木齐市东北郊碗窑沟断层超浅层地震探测初步研究
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摘要
碗窑沟断层是乌鲁木齐市主要的晚更新世中期活动断层,在市区与郊区被厚约数十米的第四系所覆盖。本文介绍了在乌鲁木齐市东北郊干扰背景较小地段对碗窑沟断层进行的超浅层纵波反射探测情况。在选取小道间距、适当偏移距、短排列、多次覆盖、高频检波器接收的工作方法和合理数据处理方法基础上,获取了3条典型纵波反射剖面,都可较清楚地分辨出第四系底界和断层位置。表明在探测环境比较好的条件下,采用合适的观测系统,在断层两盘介质存在明显差异的地区可以采用纵波反射方法探测出埋深小于50 m的断层。
Wanyaogou Fault is the main active fault in Urumqi city,Xinjing Uygur Autonomous Region,which had avtived in the middle period of late-Pleistocene.It is covered by the Quaternary deposits with depth of some tens meters in urban and suburban areas of Urumqi.In this paper,ultra-shallow P-wave reflection exploration for Wanyaogou Fault in northeastern suburb of Urumqi with less interference background is introduced.In the exploration,we used the methods of small geophone group interval,proper offset,short spread,multiple stacking fold and high-frequency geophones,as well as appropriate data processing method,3 typical P-wave reflection profiles are carried out,from which the Quaternary base interface and the locations of the faults can be distinguished.The results show that in the good exploration environment,only if the proper surveillance layout is selected and the difference between the medium of both side is distinct,the ultra-shallow P-wave reflection method can be applied to detect the fault with depth of less than 50 m.
Wanyaogou Fault is the main active fault in Urumqi city,Xinjing Uygur Autonomous Region,which had avtived in the middle period of late-Pleistocene.It is covered by the Quaternary deposits with depth of some tens meters in urban and suburban areas of Urumqi.In this paper,ultra-shallow P-wave reflection exploration for Wanyaogou Fault in northeastern suburb of Urumqi with less interference background is introduced.In the exploration,we used the methods of small geophone group interval,proper offset,short spread,multiple stacking fold and high-frequency geophones,as well as appropriate data processing method,3 typical P-wave reflection profiles are carried out,from which the Quaternary base interface and the locations of the faults can be distinguished.The results show that in the good exploration environment,only if the proper surveillance layout is selected and the difference between the medium of both side is distinct,the ultra-shallow P-wave reflection method can be applied to detect the fault with depth of less than 50 m.
引文
①新疆地震局.乌鲁木齐城市活断层探测目标区初查与主要活断层鉴定研究报告之一,目标区主要活断层地震地质初查与活动性鉴定.2004.
②新疆地震局.新疆强震台网工程地质勘察.2004.
③新疆地质矿产局.新疆乌鲁木齐1:5万工程地质图.1988.
[1]John N Louie,Sathish k.Pullammanappallil.Seismic depth ima-ging of normal faulting in the southern Death Valley basin[J].Ge-ophysics,1997,63(1):223-230.
[2]Kiyohide Mizuno,Taku Komatsubara,Koichi Shimokawa,et al..Geological surveys across concealed active faults in the Yamaguchibasin,western Japan[A].in:Annual Report on Active Fault andPaleoearthquake Researches[R].2004,4:221-230.
[3]马文涛,徐锡伟,郝书俭,等.北京市立水桥附近黄庄-高丽营隐伏断裂的浅层地震勘探[J].地震地质,2004,26(4):698-705.
[4]徐锡伟,吴卫民,张先康,等.首都圈地区地壳最新构造变动与地震[M].北京:科学出版社,2002.135-187.
[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):524-532.
[6]潘纪顺,张先康,刘保金,等.城市活断层的抗干扰高分辨率浅层地震勘探研究[J].中国地震,2003,19(2):148-157.
[7]陈宏林,丰继林.工程地震勘察方法[M].北京:地震出版社,1998.131-132.
②新疆地震局.新疆强震台网工程地质勘察.2004.
③新疆地质矿产局.新疆乌鲁木齐1:5万工程地质图.1988.
[1]John N Louie,Sathish k.Pullammanappallil.Seismic depth ima-ging of normal faulting in the southern Death Valley basin[J].Ge-ophysics,1997,63(1):223-230.
[2]Kiyohide Mizuno,Taku Komatsubara,Koichi Shimokawa,et al..Geological surveys across concealed active faults in the Yamaguchibasin,western Japan[A].in:Annual Report on Active Fault andPaleoearthquake Researches[R].2004,4:221-230.
[3]马文涛,徐锡伟,郝书俭,等.北京市立水桥附近黄庄-高丽营隐伏断裂的浅层地震勘探[J].地震地质,2004,26(4):698-705.
[4]徐锡伟,吴卫民,张先康,等.首都圈地区地壳最新构造变动与地震[M].北京:科学出版社,2002.135-187.
[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):524-532.
[6]潘纪顺,张先康,刘保金,等.城市活断层的抗干扰高分辨率浅层地震勘探研究[J].中国地震,2003,19(2):148-157.
[7]陈宏林,丰继林.工程地震勘察方法[M].北京:地震出版社,1998.131-132.
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