Regional Questionnaire Survey on the 1995 Hyogo-ken Nambu Earthquake

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  • INOUE Naoto
    Department of Geosciences, Graduate School of Science, Osaka City University
  • SHIBAYAMA Motohiko
    Tennoji Senior High School Attached to Osaka Kyoiku University
  • TSUJIE Kenji
    Citizen's Affair, Osaka City Government
  • RYOKI Kunihiro
    Department of Liberal Arts, Osaka Polytechnic College
  • SENDA Satoshi
    Department of Geosciences, Graduate School of Science, Osaka City University Present Address: Sumisho Computer Systems Co., Ltd.
  • OKAMOTO Kentaro
    Department of Geosciences, Graduate School of Science, Osaka City University Present Address: Osaka Stadium Co., Ltd.
  • NEMOTO Hiroo
    Department of Geosciences, Graduate School of Science, Osaka City University
  • NAKAGAWA Koichi
    Department of Geosciences, Graduate School of Science, Osaka City University

Bibliographic Information

Other Title
  • 1995年兵庫県南部地震の広域アンケート調査
  • 1995年兵庫県南部地震の広域アンケート調査--高震度領域におけるアンケート震度と計測震度との関係
  • 1995ネン ヒョウゴケン ナンブ ジシン ノ コウイキ アンケート チョウサ コウシンド リョウイキ ニ オケル アンケート シンド ト ケイソク シンド ト ノ カンケイ
  • 高震度領域におけるアンケート震度と計測震度との関係
  • Relationship between the Questionnaire and Measured Seismic Intensity in High Intensity Range

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Abstract

The seismic intensity of JMA (Japan Meteorological Agency) is widely recognized to be providing the important information regarding the damage and intensity of the seismic ground motion. Several questionnaire surveys have been made to detect the essential differences consequent to not only the attribute of the distance from the epicenter or the earthquake fault but also the characteristics of the underground structure. The questionnaire survey based on the method of OHTA et al. (1979) has been applied for major earthquakes in Japan and it has been substantiated the validity of the survey method. After the 1995 Hyogo-ken Nambu earthquake, some groups have carried out questionnaire survey based on this method. The determination of questionnaire seismic intensity as calculated using the formula by OHTA et al. (1979) seems to be available sufficiently in the range of seismic intensity from II to V in JMA scale. The validity of the seismic intensity over V in JMA scale, however, has not been verified because we have not experienced the applicable larger earthquake in Japan to the present. One of the purposes of this study is to confirm the validity of the conventional method by the questionnaire survey of seismic intensity. Site conditions such as geology, topography and so on were examined to compare more strictly both values of seismic intensity obtained from the questionnaire surveys and the in situ measurement. The data selected considering site conditions could give a mean value with the lower fluctuation. The absolute values of the mean questionnaire intensity, however, are somewhat lower than the measured intensity. An equation to transform the questionnaire seismic intensity into measured one is recurred. The new questionnaire seismic intensity obtained from this study is in good agreement with the measured value.

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