天水黄土地区覆盖层厚度的反演研究
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摘要
基于天水黄土地区现场测试的539个地脉动测点数据,分析得到了其H/V频谱特征和场地卓越频率。结合该区59个钻孔编录和波速测试结果,运用1/4波长和覆盖层厚度与卓越频率统计等两种方法反演了该区黄土覆盖层厚度。结果表明,1/4波长法在黄土覆盖层较厚、且地层较为单一的Ⅲ、Ⅳ级阶地具有较好的适应性;覆盖层厚度与卓越频率统计法得出了较高精度的覆盖层厚度与卓越频率之间的幂函数关系,简化了剪切波速的影响,在整个研究区域具有较好的适应性。
Based on the microtremor observation data of 539 measuring points in Tianshui,horizontal-to-vertical spectral ratio and the predominant frequency are analyzed.According to the geological records of 59 boreholes and shear wave velocity distribution,two methods including the quarter-wave length and statistical relationship between overburden thickness and predominant frequency are applied to inverse the overburden thickness.The results show that the quarter-wave length has great flexibility to the third and the fourth terraces with a thicker overburden and single stratum;high accurate formula simplifying the influence of shear wave velocity is drawn with the method of the statistical relationship between the overburden thickness and the predominant frequency;and it is suitable for the whole studied area.
Based on the microtremor observation data of 539 measuring points in Tianshui,horizontal-to-vertical spectral ratio and the predominant frequency are analyzed.According to the geological records of 59 boreholes and shear wave velocity distribution,two methods including the quarter-wave length and statistical relationship between overburden thickness and predominant frequency are applied to inverse the overburden thickness.The results show that the quarter-wave length has great flexibility to the third and the fourth terraces with a thicker overburden and single stratum;high accurate formula simplifying the influence of shear wave velocity is drawn with the method of the statistical relationship between the overburden thickness and the predominant frequency;and it is suitable for the whole studied area.
引文
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[2]吴志坚,曾立峰,王兰民,等.地脉动法在黄土地区S波速度构造探测中的应用[J].上海交通大学学报(自然版),2011,V45(5):696-700.WU Zhi-jian,ZENG Li-feng,WANG Lan-ming,et al.Application of microtremor method in shear wavevelocity structure survey at loess regions[J].Journal ofShanghai Jiaotong University(Science),2011,V45(5):696-700.
[3]吴志坚,车爱兰,王兰民,等.常时微动测试在汶川地震甘肃灾区建筑结构震害调查中的应用[J].西北地震学报,2009,31(1):86-90.WU Zhi-jian,CHE Ai-lan,WANG Lan-ming,et al.Application of microtremor observation on disasterinvestigation of the 2008 Wenchuan earthquake forbuilding structures in the quake hit areas of Gansuprovince[J].Northwest Seismology Journal,2009,31(1):86-90.
[4]王兰民,吴志坚.汶川地震场地条件对地震动放大效应的影响[J].土木建筑与环境工程,2010,31(增刊2):175-178.WANG Lan-ming,WU Zhi-jian.Effects of site conditionson amplification of ground motion of the 2008 Wenchuanearthquake[J].Journal of Civil,Architectural andEnvironmental Engineering,2010,31(Supp.2):175-178.
[5]陈棋福,刘澜波,王伟君,等.利用地脉动探测北京城区的地震动场地响应[J].科学通报,2008,53(18):2229-2235.CHEN Qi-fu,LIU Lan-bo,WANG Wei-jun,et al.Siteeffects on earthquake ground motion based onmicrotremor measurements for metropolitan Beijing[J].Chinese Science Bulletin,2008,53(18):2229-2235.
[6]NAKAMURA Y.A method for dynamic charactersestimation of subsurface using microtremors on theground surface[R].QR of RTRI,1989,30(1):25-33.
[7]YUNCHA A L Y,FRANCISCO L.On the horizontal-to-vertical spectral ratio in sedimentary basins[J].Bulletin ofthe Seismological Society of America,2000,94(4):1101-1106.
[8]DAVENPORT P N,STEPHENSON W R.Westport andGreymouth microtremor investigation[R].[S.l.]:Instituteof Geological and Nuclear Science Limited,2004.
[9]YOSHIHIRO S,MASAHIRO T,MINATO W,et al.Applicability of microtremor H/V method for KIK-NETstrong motion observation sites and NoBi plain[C]//Proceedings of the 13th World Conference on EarthquakeEngineering.Vancouver BC:DVD-ROM paper,2004:855-867.
[10]TOKIMATSU K,MIYADERA Y.Characteristics ofRayleighwaves in microtremors and their relation tounderground structures[J].Struct.Constr.Eng.,1992,439:81-87.
[11]PAROLAI S,BORMANN P,MILKEREIT C.Newrelationships between Vs,thickness of sediments,andresonance frequency calculated by the H/V ratio ofseismic noise for the cologne area(Germany)[J].Bulletinof the Seismological Society of America,2002,92:2521-2527.
[12]UEBAYASHI H.Extrapolation of irregular subsurfacestructures using the horizontal-to-vertical spectral ratio oflong-period microtremors[J].Bulletin of theSeismological Society ofAmerica,2003,93:570-582.
[13]MALTE I S,JVRGEN W.Microtremor measurementsused to map thickness of soft sediments[J].Bulletin of theSeismological Society of America,1999,89(1):250-259.
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