著者

三好 寿 牧野 清

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.25, no.1, pp.33-43, 1972-07-30 (Released:2010-03-09)

参考文献数

6

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The lowlands of southwestern islands of Okinawa are dotted with many blocks of coral which were quarried and conveyed from the reef on the floor of the sea, by the giant tsunami of April 24, 1771. We investigated the distribution of blocks in Ishigaki Island. We chose the third biggest block in this island, the approximate weight of which is 750 tons. It lies some 2.5 kilometers away from the nearest coast line, and its location reaches some 30 meters above sea level. We pierced a tunnel through the base of this huge block, which is the hardest to be imagined to have been conveyed by the tsunami, and demonstrated that this block takes no root. In the opinion of some persons, these blocks are the negro heads of the erosion type. But our tunnel crushed down this opposition. One is apt to feel that this capacity of the tsunami is rather fantastic in view of wave dynamics. But, for example, the giant wave observed in Lituya Bay (Alaska) in 1958, the energy of which was ascertained accurately, could have conveyed the supposed coral pillar whose cross section is some 27.3mm2, to the same position of the above-mentioned block, losing only 0.73% of its wave energy.Then we considered the action of the tsunami of 1771 upon the tied-island called Funakuyâ in Ishigaki Island. We confirmed that it is traditionally said that the northern part of this island has never been isolated from the main part of the island.

著者

三好 寿 牧野 清

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.25, no.1, pp.33-43, 1972

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The lowlands of southwestern islands of Okinawa are dotted with many blocks of coral which were quarried and conveyed from the reef on the floor of the sea, by the giant tsunami of April 24, 1771. We investigated the distribution of blocks in Ishigaki Island. We chose the third biggest block in this island, the approximate weight of which is 750 tons. It lies some 2.5 kilometers away from the nearest coast line, and its location reaches some 30 meters above sea level. We pierced a tunnel through the base of this huge block, which is the hardest to be imagined to have been conveyed by the tsunami, and demonstrated that this block takes no root. In the opinion of some persons, these blocks are the negro heads of the erosion type. But our tunnel crushed down this opposition. One is apt to feel that this capacity of the tsunami is rather fantastic in view of wave dynamics. But, for example, the giant wave observed in Lituya Bay (Alaska) in 1958, the energy of which was ascertained accurately, could have conveyed the supposed coral pillar whose cross section is some 27.3mm<SUP>2</SUP>, to the same position of the above-mentioned block, losing only 0.73% of its wave energy.<BR>Then we considered the action of the tsunami of 1771 upon the tied-island called Funakuy&acirc; in Ishigaki Island. We confirmed that it is traditionally said that the northern part of this island has never been isolated from the main part of the island.

著者

三好 寿 佐藤 要 都司 嘉宣

出版者

日本海洋学会

雑誌

日本海洋学会誌 (ISSN:00298131)

巻号頁・発行日

vol.45, no.3, pp.174-180, 1989-06-25 (Released:2011-06-17)

参考文献数

7

被引用文献数

1

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慶長9年 (1605年2月3日) の津波波源が, 2個分離型か, 1個合体型かは, 日本社会の直面する最重要問題のひとつである. 海洋学知識が普及していない時代には, 八丈島 (含・小島) の被害パターンが重要な鍵と考えられた.戦後の動乱期に, その情報が日本に入り, 貿易風による大波と津波の複合という重要考察が読み落され, 1946年のアリューシャン津波が超巨大津波と想定された情況に似る.筆者らは延べ8年間の, 八丈島をめぐる1月, 2月の季節風風向の統計を求め, 八丈島の被害パターンは, 非常に高い確率で, 季節風による大波に若干の津波が重なったものによるとして説明し尽されることを示した.これにより, 静岡県の多数の寺の過去帳が1605年2月3日の人命損失を記録していないことを, 分離型震源との結論の鍵と考えても後顧の心配がないことが示された.

著者

桑江 豊 三好 寿顕 関根 正樹 辻 美和 藤元 登四郎 田村 俊世

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.50, no.6, pp.535-542, 2012-12-10 (Released:2013-07-31)

参考文献数

17

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This study was performed to examine the effects of weekly exercise in subjects classified as support_1 according to the Japanese health care insurance system. We evaluated the ability of eight elderly subjects to walk using wireless inertia sensors with an embedded triaxial accelerometer and angular velocity sensor. The subjects participated in training once a week and were evaluated once a month over a study period of 3 months. Wearable motion sensors were attached to the lower back and both thighs of each subject. The subjects performed high-performance walking over a distance of 10 m. The speed, cadence, gait cycle, thigh pitch angle, and autocorrelation function on the lower back were determined. The subjects attained high-performance walking sooner after 3 months. Although most of the subjects showed an improvement in walking ability, there were no significant improvements in the cadence gait cycle or autocorrelation function. Exercise once a week can significantly improve the ability of elderly subjects to walk. Thus, home exercise is recommended to improve walking ability in the elderly.