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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第72号 >


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タイトル: 中千島で発生した巨大地震
その他のタイトル: Characteristics of great earthquakes occurring in the central Kuril Islands
著者: 高橋, 浩晃 著作を一覧する
前田, 宜浩 著作を一覧する
笠原, 稔 著作を一覧する
発行日: 2009年 3月15日
出版者: 北海道大学大学院理学研究院自然史科学部門(地球物理学) = Department of Natural History Sciences (Geophysics), Graduate School of Science, Hokkaido University
誌名: 北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University
巻: 72
開始ページ: 399
終了ページ: 410
抄録: We investigate the characteristics of great earthquakes occurring in the central Kuril Islands on 1915, 1918, 2006 and 2007. Comparisons of seismic intensity distributions, tsunami data and waveforms of above four events were made. Though magnitudes of these earthquakes were almost the same, only the 1915 event did not generate observable tsunami. This fact may be due to deep focal depth of this earthquake. Similarities of seismic intensity distributions between the 1915, 1971 and 2008 deep-focus earthquakes also imply that the 1915 event was the deep-focus event in the northeastern Okhotsk Sea. Waveform properties of the 1915 and 2008 events supports above hypothesis. We conclude, therefore, that the 1915 earthquake was not the event in the central Kuril Island but in the Okhotsk Sea with deep depth. Large tsunami and widespread felt area of the 1918 earthquake show that this event was a typical shallow-dipping thrust event on plate boundary as indicated by previous studies.
資料タイプ: bulletin (article)


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