最近の研究の紹介：木造住宅の崩壊解析による耐震診断−新しい精密・動的な耐震診断と補強方法−

木造の建売/注文住宅の崩壊解析による耐震診断法を開発。住まいの新しく精密で動的な耐震診断法であり、設計図から建物の欠陥を発見。シミュレーションで３次元（d3）アニメ動画表示。建設業者/メーカーによる耐震リフォーム/耐震補強/地震対策の費用を安く抑え、地震に強い一戸建て木造の新築/中古/建売/注文住宅の建設/家づくり/リフォーム/耐震改修を達成。

論文著者名：タイトル
（雑誌名）

地震, Vol. 57, pp. 29-43, 2004
粒子軌跡のモデル化法によるレイリー波の伝播方向の一推定方法 (1)
楊仲元，川上英二，H. R. Haddadi，孫耀南

A Method of Estimating Propagation Direction of Rayleigh Waves
by Modeling Particle Motions

     The methods for extracting the relationships between seismic waveforms are often used to investigate ground wave propagation properties because of the complexity of actual ground motions. In this paper, the method of normalized input-output minimization (NIOM) is modified so that the predominant frequency of the modeled ground motions is similar to that of the observed ground motions and so that the band-pass filter can be used. This modified NIOM method is applied to the vertical and horizontal components of seismographs observed at the ground surface during a distant earthquake occurred in Tibet-India border region and recorded worldwide, and the average motion of soil particles is studied. We estimate the direction of wave propagation from that with the largest amplitude obtained by the NIOM method. We find that the estimated direction is similar to the great-circle direction. We also find that the average particle motion modeled by the modified NIOM method is similar to the theoretical particle motion of Rayleigh waves in a semi-infinite medium.

Key words : Wave propagation, Waveform analysis, Rayleigh waves, Spectral analysis, Surface waves.