著者

高橋 龍太郎 羽鳥 徳太郎

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.40, no.4, pp.873-883, 1963-03-10

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1. There are many theoretical studies on the generation of gravity waves due to an initial surface elevation or to a surface impulse. As to model experiments, however, very few studies have been made on this subject. Recent investigations of after-shocks and the propagation of tsunami waves have revealed that most of the generating area of a tsunami seems to be strongly elliptical in shape. The present experiment has been undertaken to clarify experimentally the characteristics of waves generated by a sudden dislocation of the bottom of elliptic shape. The experiment was carried out in a model basin (25m×40m×0.6m), in Chiba Prefecture, belonging to the Earthquake Research Institute. (Fig. 19). 2. The wave generator is an iron box, 94 cm × 56 cm × 4 cm in size, placed at the bottom level of the basin. It has an elliptic opening on the top covered with a rubber membrane, 2 mm thick, 90 cm × 30 cm (Fig. 20). This elliptic rubber membrane is made to swell out suddenly by compressed air as shown in Figs. 1 and 21. The wave-height gauge is of the parallel-wire type, consisting of 2 stainless steel triangular plates (Fig. 2). The sensitivity of the recorder is such that a deflection of 10mm on the record corresponds to 5.0mm in the water level change. No remarkable effect of capillarity exists in the records. The wave-heights were recorded by a 12-channel portable optical oscillograph. Eleven wave-height gauges were used, the remaining channel of the oscillograph being reserved for recording the motion of the center of the rubber membrane. The oscillograph chart was driven at a speed of either 10 or 30 mm/sec. 3. Records of waves due to the upheaval of the membrane were obtained at every foot from the center of the origin up to 4m and for a water depth of 5.0 cm and 17.3 cm. Details of experimental runs are shown in Table 1 and Fig. 5. A record in Fig. 6 shows the displacement of the center of the rubber membrane when the paper speed is 100 mm/sec. The time of the displacement was fixed at about 1/40 sec for all runs in the experiments. Figs. 7 and 8 show the final forms of the rubber membrane when expanded under certain pressures. Forms may be considered to be nearly a part of a paraboloid. 4. Figs. 22 and 23 are wave-height records for the water depths of 5.0 cm and 17.3 cm respectively. In these records, Nos. 1, 2 and 7 show wave-heights, respectively, just above the center of the origin and at the ends of the short and long axes of the elliptic rubber membrane. No. 12 is a record of the displacement of the centre of the origin. The front of a wave train is propagated roughly with the velocity √gh, except in the immediate neighbourhood of the origin, where a considerably larger velocity is observed. (Fig. 9) Wave trains have a dispersive character as shown in Fig. 11. 5. The initial surface elevation of water above the origin is about half of the displacement of the bottom itself. (Fig. 12). The ratio of the wave-heights at the ends of the long and short axes of the origin area is one-third, but for the positions distant from the origin, this ratio decreases. This result is interesting because the height ratio coincides with the length ratio of the elliptical axes (Fig. 13). The amplitude of an initial crest seems to decrease as r-0.5 and r-0.74 when the depths are 5.0cm and 17.3cm respectively (Fig. 14). Energy of the long-wave can be expressed as follows: E∝rη2L r: distance, η: wave-height, L: length of wave. Then we have EB/EA=(ηB/ηA)2 LB/LA EA, ηA and LA are energy, wave-height and wave length respectively along the long axis. EB, ηB and LB are corresponding quantities along the short axis. At the elliptic margin of the origin we have ηb/ηa = 3, Lb/La = 0.42, therefore Eb/Ea = 3.8, in the case of a water depth of 5 cm. For the distances 1m ≧ r ≧ 4m ηB/ηA = 1.8, LB/LA = 0.40, EB/EA = 1.3 Fig. 16 shows the azimuthal distribution of energy obtained by Run 8. The relation between the wave-length of the waves emitted into a certain direction and the radius of the ellipse in that direction seems to indicate that these two lengths are roughly proportional in the case of shallow water. (Fig. 17).

著者

相田 勇 梶浦 欣二郎 羽鳥 徳太郎 桃井 高夫

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.42, no.4, pp.741-780, 1965-03-15

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A tsunami accompanying the Niigata Earthquake of June 16, 1964 is described on the basis of mareograms collected in the vicinity of the source area and a field survey, carriedout immediately after the earthquake by the members of the Earthquake Research Institute, along the coast of the Japan Sea from Akita to Naoetsu. The generating area of the tsunami, estimated by means of an inverse travel chart of the wave front based on the arrival time of the initial motion of the tsunami to the coastal station, is located in the sea on the continental shelf, extending about 90km in an elongated shape roughly parallel to the coast line from the northern part of Niigata Prefecture to Yamagata Prefecture.

著者

羽鳥 徳太郎 小山 盛雄

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.49, no.1/3, pp.127-142, 1971-09-30

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For the tsunamis which were generated off the Pacific coast of Japan during the last 76 years (1894-1969), the tsunami travel times observed at 12 tide stations are listed in Table 1. Features of the frequency distribution of travel time for NE Japan are different from those for SW Japan, because of the difference of the geographic characteristics of the tsunami source (Fig. 1). In the former region, a large frequency is found in the range of 30~40min, in contrast to 10~20m in the latter region. Starting from 19 tide stations indicated in Fig. 2, the inverse refraction diagrams of long waves are drawn on bathymetric charts (Figs. 3-12). Wave fronts are shown at 2min intervals. The uncertainty of the diagrams may be within ±2min for most of the regions considered.

著者

羽鳥 徳太郎 相田 勇 岩崎 伸一 日比谷 紀之

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.56, no.1, pp.245-263, 1981-08-31

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Owase located on the east side of Kii Peninsula has been hit by many tsunamis. Sources of most tsunamis were off Tokaido along the Nankai Trough. The 1960 Chile tsunami that propagated across the Pacific Ocean also hit Owase City. There remain even now traces of the inundated level on many houses in Owase caused by the 1944 Tonankai and 1960 Chile tsunamis. Based on these traces, the inundation heights of the two tsunamis run-up on land were surveyed, using the automatic level from Nov. 4 to 7, 1980. The relation between the geographical distribution of the inundation heights and the damage to houses was investigated. The results of the present surveys are as follows: 1) The inundation heights of the 1944 Tonankai tsunami at the harbor were 5.0-5.5 m above M.S.L. Ground about 3.0 m above M.S.L. was inundated. The inundated area stretched along the Kita River. The water level decreased in height as it moved inland. The topography of the ground controls the damage to houses. Fifty percent of the ordinary Japanese wooden type houses were damaged when the water reached 1.5 m above the ground. From the inclination of the water surface along the Kita River, the mean water velocity is calculated as 3.5 m/sec. 2) The inundation heights of the 1960 Chile tsunami at the harbor were 3.0-3.5 m above M.S.L. Although the water reached 1.0-1.5 m above the ground, hardly any houses were washed away. The traces of the inundated level into land are nearly flat, suggesting that the velocity of the incident flow was small. 3) Based on old documents, the inundation height of the Ansei Tokai tsunami (Dec. 23, 1854) is estimated as 6.5 m above M. S. L. The heignt is 0.7-1 m higher than that of the 1944 Tonankai tsunami. Ground above 4 m high was inundated.

著者

羽鳥 徳太郎

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.58, no.3, pp.723-734, 1984-01-14

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多数の検潮記録を用い,日本海中部地震による津波の波源域,規模などを調査した.波源域は水深2,000mの海域を中心に,津軽・男鹿沖間長さ140km,幅90kmと推定される.津波マグニチュードは,Δ-H曲線からm=2.5と格付けされる.日本海全域の津波伝播図を示し,伝播についての特徴を述べた.また,歴史津波を加え,日本海側でおきた津波の波源域分布を示し,波源域の配列・津波の空白域などを考察した.

著者

Nagashima Takuya Shirakawa Hisashi Nakagawa Takayuki Kaneko Shuji

出版者

Nature Publishing Group

雑誌

Scientific reports (ISSN:20452322)

巻号頁・発行日

vol.6, 2016-05-20

被引用文献数

45

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有害事象ビッグデータから副作用の分子メカニズムを解明-統合失調症治療薬が起こす高血糖はビタミンDで防止できる. 京都大学プレスリリース. 2016-05-23.

著者

安野 麻子 Asako Yasuno

雑誌

年報・フランス研究 (ISSN:09109757)

巻号頁・発行日

no.34, pp.67-80, 2000-12-25

著者

淺原 達郎

出版者

京都大學人文科學研究所

雑誌

東方學報 (ISSN:03042448)

巻号頁・発行日

vol.85, pp.764-764, 2010-03-25

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Two oracle bones in the collection of our insitute, no. 2384 and no. 2370, can be rejoined together.

著者

堤 ひろゆき

出版者

東京大学大学院教育学研究科

雑誌

東京大学大学院教育学研究科紀要 (ISSN:13421050)

巻号頁・発行日

vol.51, pp.11-20, 2012-03-10

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The purpose of this study is to clarify the impact that the practice of sport in an old-system junior high school had on both students and the school through an analysis of the school's alumni association magazines published from the 1900s to the 1930s, a period in which the alumni association went through major reform. The paper clarifies the relationship between sports and spirituality within the school and the way in which this relationship was formed. It shows that the way in which spiritual issues were discussed in the magazine differed according to whether they related to matters solely internal or also external to the school. It also shows that reform resulted in all students being forced to take part in sports. Spirituality relating to sport was supported by different logic depending on whether the subject was solely internal or also external to the school, but was linked together as a result of reform, and students'spirituality began to be measured by the marks they achieved in sport.

著者

UMEDA Yasuharu INOUE Takashi

出版者

Hokkaido University

雑誌

Journal of the Faculty of Agriculture, Hokkaido University (ISSN:0018344X)

巻号頁・発行日

vol.62, no.2, pp.167-181, 1985-03

著者

飯塚 めぐみ

出版者

ストラータ同人会

雑誌

Strata

巻号頁・発行日

vol.6, pp.53-64, 1991-03-31

著者

藤城 理 近森 節子 相根 誠 片岡 龍之

出版者

立命館大学大学行政研究・研修センター

雑誌

大学行政研究

巻号頁・発行日

vol.6, pp.95-112, 2011-03

著者

トゥーノ エリック 秋山 聰

出版者

東京大学グローバルCOEプログラム「死生学の展開と組織化」

雑誌

死生学研究 (ISSN:18826024)

巻号頁・発行日

vol.11, no.1, 2009-03-15

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公開・国際シンポジウム「聖遺物とイメージの相関性 東西比較の試み」

著者

岩見 紫乃

出版者

工学系研究科技術経営戦略学専攻

巻号頁・発行日

2014-03-24

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学位の種別: 課程博士

著者

Dushenko S. Ago H. Kawahara K. Tsuda T. Kuwabata S. Takenobu T. Shinjo T. Ando Y. Shiraishi M.

出版者

American Physical Society

雑誌

Physical Review Letters (ISSN:10797114)

巻号頁・発行日

vol.116, no.16, 2016-04-21

被引用文献数

71

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次世代スピントロニクス材料であるグラフェンにおいてスピンを電圧に変換する新しい機能を発見. 京都大学プレスリリース. 2016-05-18.

著者

中川 道子 二村 年哉

出版者

北海道大学留学生センター

雑誌

北海道大学留学生センター紀要

巻号頁・発行日

vol.4, pp.18-37, 2000-12

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日本語学習者の漢字読みテストの誤答にみられた短音化と長音化の傾向が、学習者の聴覚的な音の長短の認識の違いに起因すると推測し、その確かな傾向を探るために2音節語の聞き取り調査を行った。その結果、長母音を短母音と聞く誤り(短母音化)には(1)前音節より後音節に起こりやすい、(2)前音節では拗音を含む長母音が短母音化しやすい、(3)前音節では平板アクセントに、後音節では頭高アクセントに起こりやすい、の傾向があった。短母音を長母音と聞く誤り(長母音化)には(1)前音節より後音節に起こりやすい、(2)「よ」音を含む音節は含まない音節より長母音化率が高い、(3)前音節ではアクセントによる差はあまりないが、後音節では頭高アクセントより平板アクセントに多い、の傾向が見られた。さらに、聞き取り調査に用いたテスト語の持続時間を測定し、前音節と後音節の持続時間の割合を調べたところ、この割合は学習者の誤聴傾向と高い関連性があった。よって前音節と後音節の持続時間の違いが母音の長短の認識のずれの一因となっていると考えられる。

著者

Kasada R Ha Y Higuchi T Sakamoto K

出版者

Nature Publishing Group

雑誌

Scientific reports (ISSN:20452322)

巻号頁・発行日

vol.6, pp.Nature Publishing Group, 2016-05-10

被引用文献数

19

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模擬溶融デブリ中のホウ素の化学状態分布の解析に成功-福島第一原子力発電所の廃炉推進への貢献に期待-. 京都大学プレスリリース. 2016-05-17.

著者

橋本 康二

出版者

京都大学哲学論叢刊行会

雑誌

哲学論叢 (ISSN:0914143X)

巻号頁・発行日

vol.19, pp.84-95, 1992-09-01

著者

森泉 慎吾 モリイズミ シンゴ

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26821

著者

山口 巌

出版者

日本古代ロシア研究会

雑誌

ことばの構造とことばの論理 : 山口巖教授停年記念論文集 (ISSN:02891255)

巻号頁・発行日

pp.530-539, 1998-07

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古代ロシア研究特別号