震级、震源距对地震信号H/V影响分析
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摘要
本文采用喜马拉雅科学探测台阵四川省境内10个台站,计算了所有地震信号0.5—15Hz的H/V谱比,分析了震级、震源距对H/V谱比的影响,并与各台站场地地脉动H/V谱比进行了比较.结果表明:震级对各台站地震信号的H/V谱比振幅值以及峰值频率几乎没有影响;震源距对谱峰明显的H/V谱比曲线的谱形和峰值频率影响不大,但对谱峰不明显的H/V谱比曲线的峰值频率有一定影响;H/V谱峰明显的台站,地震信号与地脉动信号的H/V谱比曲线的峰值频率具有很高的一致性,H/V谱峰不明显的台站,二者的峰值频率有一定差异.
This paper computes H/Vspectral ratio between 0.5Hz and 15 Hz of seismic records from the ten stations of the Himalayan array located in Sichuan Province,and the influence of magnitude and hypocentral distance on the H/V spectral ratio is analyzed.Finally the H/Vspectral ratios of seismic signals are compared with those of microtremor.The results indicate that the magnitude almost has no influence on amplitude and peak frequency of H/V spectral ratio of seismic signal.On the other hand,hypocentral distance has no influence on amplitude shape and peak frequency of H/V spectral ratio of seismic signal when the spectra peak is obvious,whereas when the spectra peak is not obvious,it may have some influence on the peak frequency.For the stations with obvious spectra peak,peak frequency of H/V spectral ratio of seismic signal is coincident with that of microtremor,while different from each other for the stations without obvious spectra peak.
This paper computes H/Vspectral ratio between 0.5Hz and 15 Hz of seismic records from the ten stations of the Himalayan array located in Sichuan Province,and the influence of magnitude and hypocentral distance on the H/V spectral ratio is analyzed.Finally the H/Vspectral ratios of seismic signals are compared with those of microtremor.The results indicate that the magnitude almost has no influence on amplitude and peak frequency of H/V spectral ratio of seismic signal.On the other hand,hypocentral distance has no influence on amplitude shape and peak frequency of H/V spectral ratio of seismic signal when the spectra peak is obvious,whereas when the spectra peak is not obvious,it may have some influence on the peak frequency.For the stations with obvious spectra peak,peak frequency of H/V spectral ratio of seismic signal is coincident with that of microtremor,while different from each other for the stations without obvious spectra peak.
引文
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Nakamura Y.1989.A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface[J].QR of RTRI,30(1):25--33.
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Sawada Y,Taga M,Watanabe M,Nakamoto T,Nagumo H,Kudo K,Horike M,Sakajiri N,Masaki K,Sasatani T.2004.Applicability of microtremor H/V method for Kik-net strong motion observation sites and Nobi plain[C]∥13th World Conference on Earthquake Engineering,855.Canada:Vancouver:1--12.
Theodulidis N,Bard P Y,Archuleta R,Bouchon M.1996.Horizontal-to-vertical spectral ratio and geological conditions:The case of Garner Valley Downhole Array in southern California[J].Bull Seismol Soc Am,86(2):306--319.
Zhang W B,Matsunami K.2000.A comparison of site-amplification estimated from different methods using a strongmotion observation array in Tangshan,China[C]∥12th World Conference on Earthquake Engineering,0643:1--8.
马淑田,张德存.1997.数字化地震仪的响应及其使用[J].地震地磁观测与研究,18(3):30--40.Ma S T,Zhang D C.1997.The responses of digital seismographs and their usage[J].Seismological and GeomagneticObservation and Research,18(3):30--40(in Chinese).
Javier L,Francisco J C.1994.Are microtremors useful in site response evaluaions?[J].Bull Seismol Soc Am,84(5):1350--1364.
Nakamura Y.1989.A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface[J].QR of RTRI,30(1):25--33.
Nakamura Y.2000.Clear identification of fundamental idea of Nakamura’s technique and its applications[C]∥12thWorld Conference on Earthquake Engineering,2656:1--8.
Nakamura Y.2008.On the H/Vspectrum[C]∥14th World Conference on Earthquake Engineering.Beijing:1--10.
Sawada Y,Taga M,Watanabe M,Nakamoto T,Nagumo H,Kudo K,Horike M,Sakajiri N,Masaki K,Sasatani T.2004.Applicability of microtremor H/V method for Kik-net strong motion observation sites and Nobi plain[C]∥13th World Conference on Earthquake Engineering,855.Canada:Vancouver:1--12.
Theodulidis N,Bard P Y,Archuleta R,Bouchon M.1996.Horizontal-to-vertical spectral ratio and geological conditions:The case of Garner Valley Downhole Array in southern California[J].Bull Seismol Soc Am,86(2):306--319.
Zhang W B,Matsunami K.2000.A comparison of site-amplification estimated from different methods using a strongmotion observation array in Tangshan,China[C]∥12th World Conference on Earthquake Engineering,0643:1--8.
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