著者

阿部 壽 菅野 喜貞 千釜 章

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.43, no.4, pp.513-525, 1990-12-24 (Released:2010-03-11)

参考文献数

21

被引用文献数

4 23

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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.

著者

千釜 章 多田 省一郎 青沼 正光

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.51, no.1, pp.61-73, 1998-07-03 (Released:2010-03-11)

参考文献数

37

被引用文献数

2 2

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Some specific legends and traces related with historical tsunamis have been handed down among the people in the northern part of Honshu, Japan. Examples are the forest of Hiba buried by a large amount of sand and the resettlement of villages damaged by tsunamis in Shimokita Peninsula, the northeast Honshu. The aim of this paper is to reexamine their reliability by compiling old documents and results from numerical simulation of tsunamis. Results from old documents combined with numerical simulation suggest that the legends at the age of Tensho and Kan-ei period would be associated with not tsunamis but floods. And the story of damage at Tanabu town by the 1611 Keicho tsunami causing resettlement to a higher place is not reliable because the simulated tsunami could not reach the locations of the village. The sequence of events of sand transport to bury Hiba forest at four different ages could be found by filed investigation and result of dating of 14C. The ages do not correspond to the tsunami events. Such process can be explained by a formation of sand dune, meaning that a large amount of sand movement should not be caused by tsunamis.