日本海中部地震時の周期10秒前後の地震動特性

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This paper attempts to study the characteristics of long-period (2 to 20 sec) ground motions during the 1983 Nihonkai-chubu earthquake from the direct information of low-magnification seismograph records obtained at 26 observation sites of the Japan Meteorological Agency (JMA). The major conclusions obtained in this study may be summarized as follows ; 1) The deep subsurface ground structure is accurately estimated by using the travel curves of initial motions of the P-and S-waves obtained by JMA's seismograms. 2) A simple method used for estimation of maximum ground displacement is proposed after the discussion on influence of correction filter of JMA's seismograph on peak value and predominant period of the seismogram. 3) The variation of the arm length, whose effect is not considered in standard data processing, affects considerably peak ground motions. Because the mechanical arm length is not accurately known in the case of the records by the old type seismographs, the procedure of the estimation of arm length must be established. 4) The properties in th$ period range of 2 to 7 sec of the displacement records were found to be in reasonable agreement with the corresponding properties predicted by Japanese empirical relation obtained from statistical analysis on acceleration strong-motion records. 5) The velocity response spectra calculated from the displacement seismograms are compared with the design spectra given for large-scale structures such as high-rise buildings, long-span suspension bridges and large oil storage tanks. As the velocity response spectra exceed the design spectra under certain circumstances, the limit value provided by the current design practice should be increased for some sites (for example, Niigata) due to local seismic-wave amplifications.
社団法人日本建築学会の論文
1987-08-30

日本海中部地震時の周期10秒前後の地震動特性

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