声学探测技术在天津隐伏断层探测中的应用
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摘要
利用单道地震等水上声学探测技术,对天津海河断裂的浅部构造和地层错断信息进行了探测。探测结果表明,在水深较深,相对宽阔的河道内该方法可以获得较好的结果。在天津塘沽地区,海河断裂的上断点深度位于河底面以下30m左右,对应的最新活动时代为Q_p~3—Q_h~1,这与前期的钻孔勘探结果基本吻合。在渤海近海海域,海河断裂呈一组NWW-NEE向分布的断裂带,其上断点距离海底的深度小于30m,断层断错和影响的地层年代为全新世早中期,断层活动特征与塘沽地区的基本一致。
Acoustic surveying technique was applied to surveying shallow structure and faulted-stratum of Halhe fault in Tianjin.The result proves that the technique is a valid method in wide and deep river course.It also shows that in Tanggu area of Tianjin,upper faulting point of Haihe fault is about 30m beneath the river bed and the corresponding latest active period is Q_P~3—Q_h~1,which is consistent with the previous result from borehole survey. In offshore area of Bohai Sea,Halhe fault extends in the NWW-NEE direction,and its upper faulting point is less than 30m beneath seabed.The surveying results suggest that the activity of Haihe fault in Bohai Sea and in Tanggu area are similar in terms of active characteristics.
Acoustic surveying technique was applied to surveying shallow structure and faulted-stratum of Halhe fault in Tianjin.The result proves that the technique is a valid method in wide and deep river course.It also shows that in Tanggu area of Tianjin,upper faulting point of Haihe fault is about 30m beneath the river bed and the corresponding latest active period is Q_P~3—Q_h~1,which is consistent with the previous result from borehole survey. In offshore area of Bohai Sea,Halhe fault extends in the NWW-NEE direction,and its upper faulting point is less than 30m beneath seabed.The surveying results suggest that the activity of Haihe fault in Bohai Sea and in Tanggu area are similar in terms of active characteristics.
引文
陈宇坤，任峰，张翠芬等，2004．天津海河隐伏断裂的晚第四纪活动特征研究，地震地质，26(1)：111—121．
邓起东，晁洪太，闽伟等，2002．海域活动断层探测与古地震研究．中国地震，18(3)：311—315．
王揆洋，郑彦鹏，王述功，1999．声学探测技术在近岸水域地震地层探测中的应用．海洋地质与第四纪地质，19(4)：97—101．
赵根模，王大宏，任峰等，2003．声波方法在城市活断层探测与评价中的应用——人工地震、雷达与声波方法的比较与组合．中国地震，19(3)：218—224．
邓起东，晁洪太，闽伟等，2002．海域活动断层探测与古地震研究．中国地震，18(3)：311—315．
王揆洋，郑彦鹏，王述功，1999．声学探测技术在近岸水域地震地层探测中的应用．海洋地质与第四纪地质，19(4)：97—101．
赵根模，王大宏，任峰等，2003．声波方法在城市活断层探测与评价中的应用——人工地震、雷达与声波方法的比较与组合．中国地震，19(3)：218—224．
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