中国沿海及内陆地区长周期脉动特征分析
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摘要
地脉动台阵观测作为一种低成本的剪切波速度构造探测方法,预计将在中国地震灾害预防中起到重要作用。为了研究地脉动台阵观测中长周期信号的特征以及中国长周期地脉动的特点和适用性,开展了中国从沿海到内陆地区地脉动信号的观测和分析,探查由沿海到内陆地区地脉动的变化规律以及内陆地区广域的地脉动特征,发展适合于我国内陆地区的基于地脉动的地下构造勘探方法,在中国大陆上海市、西安市、天水市及兰州市进行了长周期地脉动观测。现场试验结果表明,上海地脉动特征与日本关东平原地区的观测结果类似,可以认为在海岸地区深部结构调查的地脉动台阵观测有良好的适用性。然而,西安、兰州、天水长周期地脉动能量只有上海的千分之一,因此需要进一步研究更加灵敏的仪器性能和更加稳定的观测方法。
As simple and quick methods for site characterization,the array microtremor survey as well as H/V observation is expected to play an important role in earthquake disaster prevention in China.In order to study the characteristics and applicability of microtremor survey,we have made microtremor observations and analysis over a wide area from the coast to the far inland.The result of field test is shown that the microtremor in Shanghai is much similar to that in Kanto Plane,Japan,inferring a high applicability of array microtremor for deep structure survey in the coast area.However,the energy of long-period microtremors in Xi'an,Lanzhou and Tianshui area are only some thousandth to some percents of that in Shanghai,inferring that further study on instrument and observation method are needed.
As simple and quick methods for site characterization,the array microtremor survey as well as H/V observation is expected to play an important role in earthquake disaster prevention in China.In order to study the characteristics and applicability of microtremor survey,we have made microtremor observations and analysis over a wide area from the coast to the far inland.The result of field test is shown that the microtremor in Shanghai is much similar to that in Kanto Plane,Japan,inferring a high applicability of array microtremor for deep structure survey in the coast area.However,the energy of long-period microtremors in Xi'an,Lanzhou and Tianshui area are only some thousandth to some percents of that in Shanghai,inferring that further study on instrument and observation method are needed.
引文
[1]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.BO Jing-shan,LI Xiu-ling,LI Shan-you.Some progressof study on the effect of site conditions on groundmotion[J].World Earthquake Engineering,2003,19(2):11-15.
[2]CHE AILAN,IWATATE TAKAHIRO,GE XIURUN.Study on the applicability of frequency spectrum ofmicro-tremor and dynamic characteristics of surfaceground in Asia area[J].Journal of Zhejiang UniversityScience,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 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]NAKAMURA Y A.A method for dynamic characteristicsestimation of subsurface using microtremor on the groundsurface[J].Rep.Railway Tech.Res.Inst.,1989,30(1):25-33.
[5]TOKIMATSU K,MIYADERA Y.Characteristics ofRayleigh waves in microtremors and their relation tounderground structures[J].Struct.Constr.Eng.,1992,(439):81-87.
[6]ARAI H,TOKIMATSU K.S-wave velocity profiling byinversion 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]//Proceedings of12th World Conference of Earthquake Engineering,Auckland:[s.n.],2000:2232.
[2]CHE AILAN,IWATATE TAKAHIRO,GE XIURUN.Study on the applicability of frequency spectrum ofmicro-tremor and dynamic characteristics of surfaceground in Asia area[J].Journal of Zhejiang UniversityScience,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 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]NAKAMURA Y A.A method for dynamic characteristicsestimation of subsurface using microtremor on the groundsurface[J].Rep.Railway Tech.Res.Inst.,1989,30(1):25-33.
[5]TOKIMATSU K,MIYADERA Y.Characteristics ofRayleigh waves in microtremors and their relation tounderground structures[J].Struct.Constr.Eng.,1992,(439):81-87.
[6]ARAI H,TOKIMATSU K.S-wave velocity profiling byinversion 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]//Proceedings of12th World Conference of Earthquake Engineering,Auckland:[s.n.],2000:2232.
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