地脉动法在黄土地区S波速度构造探测中的应用
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摘要
在我国西部典型黄土地区分别进行连续和高密度(25 m×25 m)的地脉动观测,并分析所采集的信号,探讨了地脉动信号的时间稳定性及空间分布规律,利用地脉动水平和垂直方向(H/V)频谱反演地下黄土层的剪切波速度剖面,并与已有的钻孔波速资料进行对比.结果表明:内陆地区的地脉动信号具有良好的时间稳定性;在黄土覆盖场地,利用地脉动测试以获取地下剪切波速度构造的方法具有较好的适应性.
Based on continuous microtremor survey and high-density microtremor survey respectively at the typical loess areas in the west of China,the time stability and space distribution of microtremor data were studied.The shear wave velocity profile of underground loess layer was obtained using the inversion method of H/V frequency spectrum of microtremor,and contrasting the existing wave velocity data of borehole at this region as well.The results show that the microtremor signal is stable in time range at inland areas of China,and microtremor survey is available and effective for obtaining underground shear wave velocity profile at deep loess sediment ground.
Based on continuous microtremor survey and high-density microtremor survey respectively at the typical loess areas in the west of China,the time stability and space distribution of microtremor data were studied.The shear wave velocity profile of underground loess layer was obtained using the inversion method of H/V frequency spectrum of microtremor,and contrasting the existing wave velocity data of borehole at this region as well.The results show that the microtremor signal is stable in time range at inland areas of China,and microtremor survey is available and effective for obtaining underground shear wave velocity profile at deep loess sediment ground.
引文
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[2]Che Ai-lan,Iwatate Takahiro,Ge Xiu-run.Study onthe applicability of frequency spectrum of micro-tremorand dynamic characteristics of surface ground in Asiaarea[J].Journal of Zhejiang University Science,2006,7(11):1856-1863.
[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 micro tremor observation on disaster in-vestigation of the 2008 enchuan earthquake for buildingstructures in the quake hit areas of Gansu province[J].Northwest Seismology Journal,2009,31(1):86-90.
[4]Nakamura Y A.A method for dynamic characters est-imation of subsurface using microtremors on theground surface[R].Tokyo QR of RTRI,1989,30(1):25-33.
[5]Tokimatsu K,Miyadera Y.Characteristics of Ray-leighwaves in microtremors and their relation to under-ground structures[J].Struct Constr Eng,1992,439:81-87.
[6]Arai H,Tokimatsu K.S-wave velocity profiling by in-version of microtremor H/V spectrum[J].Bullttin ofthe Seismological Society of America,2004,94(1):53-63.
[7]Arai H,Tokimatsu K.Effects of Rayleigh and lovewaves on microtremor H/V spectra[C]//Proc 12thWorld Conference on Earthquake Engineering.Auck-land:IAEE,2000:2232.
[8]Che A L,Iwatate Takahiro,Ge X R.Evaluation ofdynamic behaviors and damage mechanism of ancienttimber architectures[J].Key Engineering Materials,2007,340-341:277-282.
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