SMART-1 Array強震記録を用いた波群識別方法に関する考察

概要

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In structural response analyses, the input ground motion is usually assumed to be a plane wave propagating vertically through homogeneous soil layers. However the ground condition and seismic wave propagation are usually more complicated. This paper examines the direction and apparent velocity of the propagating waves using the SMART-1 Array recordings, and then shows examples of discriminations of body waves and surface waves considering the coherency. The strong-motion records are divided into several sections in time history. By use of the frequency-wavenumber spectrum for each section, it is found that the direction and apparent velocity of propagation vary with time. A pair of horizontal time histories is transformed into that for the propagating and transverse directions, and the characteristics of particle motion are examined. The main part of time history seems to be composed of vertically propagating S-wave. However, the coda part seems to be composed of different waves including the surface waves which have been reflected or occurred secondarily at the edges of the alluvial plain around the recording site.
一般社団法人日本建築学会の論文
1989-03-10