仙台平野における貞観11年 (869年) 三陸津波の痕跡高の推定

DOI Web Site Web Site 被引用文献26件
  • 阿部 壽
    東北電力 (株) 女川原子力発電所建設所
  • 菅野 喜貞
    東北電力 (株) 女川原子力発電所建設所
  • 千釜 章
    東北電力 (株) 女川原子力発電所建設所

書誌事項

タイトル別名
  • Estimation of the Height of the Sanriku Jogan 11 Earthquake-Tsunami (A. D. 869) in the Sendai Plain
  • センダイ ヘイヤ ニ オケル ジョウガン 11ネン 869ネン サンリク ツナ

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抄録

It is known that great Sanriku tsunamis sometimes hit the Sendai Plain in the north part of the Honshu Island in Japan. Among those great tsunamis, the field investigation had been rarely carried out about the tsunami of July 13th, 869 (11th year of the Jogan Era) because of the lack of the materials of old documents. We carried out the field investigation of the height of this tsunami in the Sendai Plain on the basis of the archaeological view and the sedimentologic examination. The former method is based on the archaeologist's judgement whether historic relics have the trace buried by the running water or not. We estimated the inundated area from the result of the survey for the 8 points in the Sendai Plain. In the latter method, we dipped the test pit and observed the soil layer of the side wall minutely to find the sand layer being supposed to be carried by the tsunami from the dune. Moreover to analyze the character of the sand layer, we made the physical examination, the chemical analysis and the measurement of the age by 14C method. From the results of these investigations, the height of the Sanriku Jogan 11 earthquake-tsunami (A. D. 869) is estimated as 2.5-3m at the point 3km from the coastline in the Sendai Plain. Finally we checked it with the social and geographic circumstances at that time, and we got the result that the estimated height is not inconsistent with the record of this tsunami.

収録刊行物

  • 地震　第２輯

    地震　第２輯 43 (4), 513-525, 1990

    公益社団法人 日本地震学会

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