アンケートによる高密度震度調査法の修正メルカリ震度階への適用

• 村上 ひとみ

  北海道大学工学部建築工学教室

• 鏡味 洋史

  北海道大学工学部建築工学教室

書誌事項

タイトル別名

• Application of High-Precision Questionnaire Intensity Survey Method to the Modified Mercalli Intensity Scale
• アンケート ニ ヨル コウ ミツド シンド チョウサホウ ノ シュウセイ メル

抄録

Seismic intensity is an important parameter measuring earthquake shaking severity, especially in regions where few strong motion instruments are in operation. This study aims to apply high-precision questionnaire intensity method widely used in Japan to other earthquake countries.<br>Based on the Modified Mercalli (MM) Intensity Scale, an intensity questionnaire form was prepared and survey was conducted for two California earthquakes and the 1988 Nepal-India border earthquake. First, intensity coefficients are assigned to each item category based on the definition of the scale. For each questionnaire, “average” item intensity is calculated by taking average of intensity coefficients as marked, and also “maximum” item intensity by taking maximum intensity coefficient among responses.<br>In California, intensities of the USGS isoseismal maps are found larger than the “average” item intensities and is comparable to the “maximum” item intensities, presumably because the USGS guideline of intensity assessment is to choose the maximum damage phenomena.<br>In order to solve this discrepancy, we introduced fuzzy set theory and expressed intensity coefficients as distribution of likelihood belonging to continuous intensity level. Accumulating membership functions corresponding to selected item categories, the maximum value of distribution suggests the most probable intensity.<br>New method for questionnaire intensity evaluation is examined for previous data. Questionnaire intensities reasonably correlate with intensities locally reported by the USGS and Nepalese agency. Simple adjustment based on age of buildings is found satisfactory for the case of California but not so for the Nepal-India region.

収録刊行物

• 地震　第２輯

  地震　第２輯 44 (4), 271-281, 1991

  公益社団法人 日本地震学会

キーワード

• Seismic intensity
• Questionnaire survey
• Modified Mercalli Scale
• Fuzzy set theory

詳細情報

• CRID: 1390001204305666176
• NII論文ID: 130006787697
• NII論文ID: 40001526743
• NII書誌ID: AN00305741
• DOI: 10.4294/zisin1948.44.4_271
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• NDL書誌ID: 3753710
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3753710
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/44/4/44_4_271/_pdf
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