Analysis of Seismogram of the 1923 Kanto Earthquake at Tokyo by Ewing Strong-Motion Seismograph Part 2 Examination of Characteristics of Seismograph and Estimation of Ground Motion

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  • ユーイング円盤記録式強震計による1923年関東地震の記象の解析　その2　地震計の特性の検討に基づく地動の推定

Abstract

<p>From a seismogram recorded at Tokyo by a Ewing strong-motion seismograph during the 1923 Kanto earthquake, ground motion at Tokyo is restored by mending of off-scale parts and instrumental correction of the seismograph. The characteristics of the seismograph such as the rotation time of the recording disk, the natural period and damping are examined carefully, however the estimated constants of the seismograph include uncertainties. The velocity response spectrum (h = 0.05) of the restored record has peaks at a little less than ten seconds in the SW-NE direction and at 4 to 5 seconds and a little over ten seconds in the SE-NW direction, respectively. The spectrum amplitudes in 2 to 10 seconds are around 30 to 80 cm/s in the SW-NE direction and around 60 to 100 cm/s in the SE-NW direction, respectively. The amplitudes are larger than the results of the previous studies by Morioka (1980) and by Yokota et al. (1979). The restored record shows similarity in spectral characteristics with records observed at the same site during other large earthquakes and in time history of strong shaking with records of personal experiences during the Kanto earthquake.</p>

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