地震纵波横波联合勘探方法寻找近地表第四系内隐伏断裂方法研究
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摘要
这里主要针对城市活断层浅层地震探测存在的一些技术问题,结合北京平原区活动断裂监测专项地质调查项目,在近地表第四系未固结沉积层中,发育许多具有相当规模的隐伏断裂,虽用纵波反射地震方法能够探测到它们的存在,但不能追踪到超浅层。结合以往的纵波资料,采用小道间距纵、横波联合勘探方法,获得了目标场地较清晰地震图像资料,并用钻井验证方法的可靠性。探讨了极浅层乐夫波等干扰波引起的假异常,需要在数据处理和解释的过程中,采取相应的技术措施消除影响,为今后类似地区活断层地震调查提供技术参考和科学依据。
Shallow seismic reflection techniques have been successfully used to investigate active fault for decades.However,obtaining high-resolution seismic reflection images of ultra shallow subsurface features is still a challenge.Based on former geologic survey,high resolution seismic images were acquired by vombined P-wave and S-wave seismic reflection with small trace interval in the plain area of Beijing where hidden fault is well developed in unconsolidated sediments on quaternary strata.The results have been supported by drilling data.Furthermore,several technical methods had been applied to eliminate the effect of fake abnormalities caused by love wave in data processing and interpretation.
Shallow seismic reflection techniques have been successfully used to investigate active fault for decades.However,obtaining high-resolution seismic reflection images of ultra shallow subsurface features is still a challenge.Based on former geologic survey,high resolution seismic images were acquired by vombined P-wave and S-wave seismic reflection with small trace interval in the plain area of Beijing where hidden fault is well developed in unconsolidated sediments on quaternary strata.The results have been supported by drilling data.Furthermore,several technical methods had been applied to eliminate the effect of fake abnormalities caused by love wave in data processing and interpretation.
引文
[1]高景华,徐明才.地震方法确定活动断裂上断点的影响因素分析[J].地震地质,2008,30(2):338-347.
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[2]高景华,徐明才.利用地震剖面研究夏垫断裂西南段的活动性[J].地震地质,2008,30(2):497-504.
[3]徐明才,高景华.地震方法在断层活动性评价中的应用研究[J].地震学报,1998,20(3):279-284.
[4]王庆海,徐明才.地震反射技术在工程地质调查中的应用[J].工程勘察,1987,15(2):60-63.
[5]高景华,徐明才.高分辨率城市活断层地震资料处理技术[J].物探化探计算技术,2005,27(3):209-216.
[6]白云,钟以章,卢造勋.地震S波反射法在城市活动断层探测中的应用与效果研究[J].东北地震研究,2001,17(2):69-74.
[7]卢育霞,王振明.兰州盆地活断层的高分辨率浅层地震勘探技术[J].西北地震学报,2008,33(4):344-353.
[8]ROGER A YOUNG.Near-surface,SH-wave surveys in unconsolidated,alluvial sediments[J].The Leading EDGE,2001,20(9):936-948.
[9]施逸忠,王式.浅层地震横波反射法最佳应用条件研究[J].河海大学学报,1995,23(6):16-21.
[10]詹正彬,姚姚.多波及横波地震勘探[M].北京:地质出版社,1994.
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