微動観測記録から推定した表層地盤構造に基づく計測震度分布の推定とアンケート震度との比較

概要

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The earthquake of JMA magnitude 6.1 occurred in west-off Ishikawa Prefecture on June 7, 2000. Several seismometers in Kanazawa City observed the earthquake ground motion. Japan Meteorological Agency announced instrumental seismic intensity in Kanazawa City was 3, but the difference of instrumental seismic intensity was more than 0.5 at the observation sites in Kanazawa City. In this paper, the instrumental seismic intensity in Kanazawa City is calculated in consideration of the path effect and the site effect of the earthquake ground motion. The path effect is investigated by Q value and the site effect is evaluated by S wave velocity of the ground. S wave velocity of the ground was evaluated by inversion of microtremor records. As a result, the calculated instrumental seismic intensity corresponded well with the seismic intensity recorded at the observation sites in Kanazawa City. Moreover, instrumental seismic intensity and questionnaire seismic intensity are compared.
2004-08-31