小地震の加速度包絡波形の合成による大地震の最大加速度の推定

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A simplified method is proposed for synthesizing ground acceleration of large earthquake using acceleration envelope waveform of small earthquake. The fault plane of the large earthquake is divided into small elements which correspond to the small earthquake. The number of the elements is defined from the difference of magnitude between the large and small earthquakes. The acceleration envelope waveform from the small element is determined empirically from magnitude of the small earthquake and distance from the small element to an observation site. Since the acceleration time histories from the small elements should be incoherent each other, it could be considered that the acceleration envelope waveform of the large earthquake is equal to the square root of the sum of squares of the envelope waveforms from the small elements. The peak acceleration of the large earthquake is obtained from the maximum value of the summed envelope. Using this method, the peak accelerations are calculated for the earthquakes with different magnitude, and their attenuation characteristics are investigated. The result shows that 1) the shortest distance from fault plane is an appropriate definition of source distance, 2) the peak acceleration becomes independent of magnitude and distance in nearfield, 3) the functional form of the Campbell (1981)'s equation is fitted for the calculated attenuation curve, and 4) the source directivity effect is not negligible on the peak acceleration. The peak acceleration for the 1923 Kanto earthquake whose slip distribution is not uniform over the fault plane, is also calculated.
社団法人日本建築学会の論文
1989-04-30

小地震の加速度包絡波形の合成による大地震の最大加速度の推定

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