ESTIMATION OF EARTHQUAKE GROUND MOTION IN MIYAZAKI PREFECTURE USING THE H/V SPECTRAL RATIO OF MICROTREMOR

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  • OKUMA Yuuki
    (株) 三菱総合研究所 元 理化学研究所 地震防災フロンティア研究センター
  • MATSUOKA Masashi
    防災科学技術研究所地震防災フロンティア研究センター
  • YAMAZAKI Fumio
    社団法人 土木学会 東京大学生産技術研究所
  • HARADA Takanori
    社団法人 土木学会 宮崎大学工学部土木環境工学科

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  • 宮崎県における常時微動H/Vスペクトル比を用いた地震動の推定
  • ミヤザキケン ニ オケル ジョウジ ビドウ H Vスペクトルヒ オ モチイタ ジシンドウ ノ スイテイ

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Abstract

The seismic records observed from 52 stations in Miyazaki Prefecture are currently used to grasp the distribution of seismic intensity of the surface ground in the prefecture soon after the occurrence of an earthquake. However, the number of instruments may not be large enough to capture the detailed seismic intensity distribution. Hence, microtremor measurements were conducted to estimate site response characteristics of the seismic observation stations and other locations. The horizontal-to-vertical (HIV) Fourier spectral ratios were calculated for seismic records and microtremor, and their similarity was confirmed. Using the H/V spectral ratios of microtremor, the velocity response spectra for earthquake ground motions at microtremor sites were estimated and their applicability was discussed.

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