日本东北大地震时强震观测点周边地区地震动估算方法的论证
|
摘要
针对大地震发生时受灾严重而又缺少地震记录的地区,本文利用地表观测到的常时微动数据进行地震动的估算,并对此方法进行了论证。这个方法涉及两个关键步骤,即利用常时微动的H/V谱来推测观测点的地下速度结构模型,和通过震源模型合成基岩处的输入地震波。此方法基于震源模型并有效地考虑场地效应的影响,有望在缺少地震记录的受灾地区进行地震动的估算方面得到应用。
This study aims to verify the estimation method of ground motions at the target sites,e. g.,heavily damaged sites near the strong-motion station during a great earthquake,by use of microtremor data observed on the ground surface. This method involves two key procedures,i. e.,identification of underground velocity structure model from microtremor H / V spectrum and synthesis of ground motions at the seismological bedrock using source model during the mainshock. It takes the source model into account,appropriately estimates the site effect as well. It is expected to be applied in the estimation of ground motions at target sites where the earthquake records are not observed.
This study aims to verify the estimation method of ground motions at the target sites,e. g.,heavily damaged sites near the strong-motion station during a great earthquake,by use of microtremor data observed on the ground surface. This method involves two key procedures,i. e.,identification of underground velocity structure model from microtremor H / V spectrum and synthesis of ground motions at the seismological bedrock using source model during the mainshock. It takes the source model into account,appropriately estimates the site effect as well. It is expected to be applied in the estimation of ground motions at target sites where the earthquake records are not observed.
引文
[1]Midorikawa S,Miura H and Atsumi T.Strong motion records from the 2011 off the Pacific coast of Tohoku Earthquake[C].Proceedings of the International Symposium on Engineering Lessons Learned from the 2011 Great East Japan Earthquake,Tokyo,Japan,2012.
[2]川濑博,林康裕.兵库县南部地震时在神户市中央区的基岩波的逆算及强震动的模拟[J].日本建筑学会构造系论文集,1996,No.480:67-76.Kawase H and Hayashi Y.Strong motion simulation in Chuo ward,Kobe,during the Hyogo-ken Nambu Earthquake of 1995 based on the inverted bedrock motion[J],Journal of Structural and Construction Engineering(Transactions of AIJ),1996,No.480:67-76.(in Japanese with English abstract)
[3]Arai H and Tokimatsu K.Effects of Rayleigh and Love waves on microtremor H/V spectra[C].Proceedings of 12th World Conference on Earthquake Engineering,Auckland,New Zealand,2000:2232-2240.
[4]Kurahashi S and Irikura K.Short-period source model of the 2011 off the Pacific coast of Tohoku Earthquake[J].Bulletin of the Seismological Society of America,2013,103(2B):1373-1393.
[5]Yoshida N,Kobayashi S,Suetomi I and Miura K.Equivalent linear method considering frequency dependent characteristics of stiffness and damping[J].Soil Dynamics and Earthquake Engineering,2002(22):205-222.
[2]川濑博,林康裕.兵库县南部地震时在神户市中央区的基岩波的逆算及强震动的模拟[J].日本建筑学会构造系论文集,1996,No.480:67-76.Kawase H and Hayashi Y.Strong motion simulation in Chuo ward,Kobe,during the Hyogo-ken Nambu Earthquake of 1995 based on the inverted bedrock motion[J],Journal of Structural and Construction Engineering(Transactions of AIJ),1996,No.480:67-76.(in Japanese with English abstract)
[3]Arai H and Tokimatsu K.Effects of Rayleigh and Love waves on microtremor H/V spectra[C].Proceedings of 12th World Conference on Earthquake Engineering,Auckland,New Zealand,2000:2232-2240.
[4]Kurahashi S and Irikura K.Short-period source model of the 2011 off the Pacific coast of Tohoku Earthquake[J].Bulletin of the Seismological Society of America,2013,103(2B):1373-1393.
[5]Yoshida N,Kobayashi S,Suetomi I and Miura K.Equivalent linear method considering frequency dependent characteristics of stiffness and damping[J].Soil Dynamics and Earthquake Engineering,2002(22):205-222.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心