12. 地震波形を用いた液状化判定方法の開発(II. 被害予測と緊急対応 その1,第IIセッション,第8回(平成10年度)地域安全学会研究発表会)

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  • 12. Development of new method to detect subsoil liquefaction using seismic records.

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Liquefaction effect is known to increase a damage of lifeline so that there is a need to detect liquefaction quickly. Tokyo-Gas started installation of "New SI-sensor" which records waveform data on Jan. 1998 to 3600 gas regulators. If we will be able to detect liquefaction using only waveform data at 3600 points soon after large earthquake, accurate liquefaction area and pipeline damage could be estimated quickly. We analyzed about 70 waveforms including 9 liquefaction waveforms, and found 4 criterions described, as follows are necessary to detect liquefaction. (i)Amax>100 gal, (ii)SI>20 kine, (iii)D>10 cm, (iv)T>2.0 sec. Here, Amax is Peak Ground Acceleration; D is peak ground displacement; T is natural period of ground motion. Almost 100% observed liquefaction data is separated from non-liquefaction data using above criterion. We are going to apply this algorithm to "New SI-sensor". This algorithm will be also applied to other seismic sensors easily.

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