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1 0 0 0 OA 東京層砂層の液状化の痕跡調査と一考察

著者: 森伸一郎池田悦夫
出版者: Japan Society of Civil Engineers
雑誌: 土木学会論文集 (ISSN:02897806)
巻号頁・発行日: vol.1997, no.582, pp.247-263, 1997-12-21 (Released:2010-08-24)
参考文献数: 37
被引用文献数: 2

東京都新宿区四谷の江戸城四谷御門外の一連の遺跡調査において, 江戸城外堀の盛土周辺で地震の痕跡が検出された. 地震の痕跡には, 地割れ, 地滑りのほか, 噴砂脈が認められた. 現地調査, サウンディング, 粒度・比重・重鉱物・珪藻などの土質分析, および周辺の地質調査資料に基づき, 噴砂脈の供給源が更新統 (洪積層) である東京層にあることを確認した. 考古学・地震学・地盤地震工学の観点から, 地震の発生時期を特定した. 液状化しにくいと考えられていた洪積砂層も強地震動の下では液状化しうることを示した. 有史以来の歴史地震で洪積層が液状化したことを確認した初めての例である.

2021-10-19 10:12:42
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1 0 0 0 OA 立体画像における撮像条件と書き割り効果

著者: 大森朝子山之上裕一奥井誠人湯山一郎
出版者: 一般社団法人映像情報メディア学会
雑誌: 映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日: vol.53, no.3, pp.437-441, 1999-03-20 (Released:2011-03-14)
参考文献数: 10

照明条件やレンズの選択など実際の番組制作における撮像条件が, 書き割り効果に及ぼす影響を主観評価により検討した.その結果, 撮像条件により計算される両眼視差が主な要因である一方で, 背景の有無も影響を及ぼしていることが示された.

2021-10-19 06:35:15
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1 0 0 0 IR 沖縄県の地域性をだしたテレビCMの有効性の研究

著者: 宮森正樹
出版者: 沖縄国際大学商経学部
雑誌: 商経論集 (ISSN:02887673)
巻号頁・発行日: vol.24, no.1, pp.73-99, 1996-03

2021-10-19 01:30:06
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https://ci.nii.ac.jp/naid/110000979282

1 0 0 0 OA 小笠原硫黄島の異状隆起と最近の火山現象について

著者: 森本良平小坂丈予羽鳥徳太郎井筒屋貞勝浦部和順高橋春男岡田義光平林順一伊佐喬三磯部宏
出版者: Tokyo Geographical Society
雑誌: 地学雑誌 (ISSN:0022135X)
巻号頁・発行日: vol.77, no.5, pp.255-283, 1968-10-25 (Released:2009-11-12)
参考文献数: 25
被引用文献数: 3 3

Unusual uplift of the land was found about an insular active volcano Iwo-jima, Ogasawara archipelago, 1, 200 km south of Tokyo. Remarkable retreat of shore line was revealed by reviewing topographic maps and aerophotographs of the island. Some upward movements of the island are to be one of the most principal reasons of the retreat. As the clear evidences of the upheaval of the land, following phenomena were observed by the writers who investigated the island five times from 4th July to 23rd August 1968 : a) Sunken vessels and a landing craft have emerged on the western coastal beach of the island : b) Faults and cracks appeared on the abandoned run-way of the former Japanese Navy in the central part of the island ; c) Coastal reef emerged on the sea to connect off shore islet with the island ; d) New coastal terraces were formed on the sand beaches ; e) Fresh living corals were exposed on the sea.Results of the investigations are enumerated as follows : 1) About 8 m upheaval of the land since 1953-4 was revealed by levelling survey at the western coast of the island. 2) Amount of uplift observed on the above-mentioned run-way is smaller in its central part than in both terminals, maximum vertical displacement of the fault being 3 m. 3) Tide gauge installed at the western rocky coastrecorded slight relative down of sea level but further observation should be continued without disturbance by typhoon to obtain more reliable data. 4) No expected microseisms were recorded on the high sensitive electro-magnetic seismographs except 2 or 3 per day. 5) Temperature of the fumarolic gases were 95-123°C, 10-25°C higher than that observed in 1935. In spite of the rise in temperature, gases of so called high temperature type, such as sulphur dioxide and halogens, were not contained. 6) Composition of the sublimates also accords with these results of chemical analyses of the gases. 7) Content of each main component element and its ratio to other ones is quite variable in several hot springs whose pH values range from 2.1 to 6.8. 8) Analcite was identified by X-ray and DTA analyses in the tuff forming Moto-yama, an eastern main flat cone of the island. Genetic condition of the mineral inferred from its chemical composition may indicate submarine eruption of the volcano. 9) Three weak zones were recognized by the present investigations in addition to the two ones previously reported by Tsuya. Thus three are arranged radially through the center of the eastern main cone and the two are arranged concentrically around the foot of the same cone. From these weak zones phreatic explosions are expected in future, if they occur. 10) Nothing more than mere weak phreatic explosion was recorded through the historic activity of the volcano. Artificial filling up of the vent, such as the pavement of the surface often causes the small explosion at fumarole. 11) Submarine eruption recently found at the sea bottom, about 5.4 km NNE of the South Sulphur Island, about 50 km south of the island did not occur recently but must have repeated rather stationarily.According to the present investigations, no remarkable magmatic explosion could be expected except those small phreatic ones, same one of which has often occurred on the island. Chemical composition of the gases does not indicate any approach of hot magma to the surface.