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

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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.

著者

磯部 宏 西村 正治 稲葉 秀一 山本 宏司 神島 薫 川上 義和

出版者

The Japanese Respiratory Society

雑誌

日本胸部疾患学会雑誌 (ISSN:03011542)

巻号頁・発行日

vol.25, no.5, pp.535-538, 1987-05-25 (Released:2010-02-23)

参考文献数

19

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症例は28歳女性で, 咳嗽, 喘鳴を主訴に当科に入院した. 約5年前より上記症状を繰り返し, 気管支喘息として通院加療を受けていたが, コントロールは不十分であった. ペットとして猫を飼育している. アロテック吸入による1秒量の改善率は24.4%であり, 皮内テストでは猫毛, 犬毛, ハウスダストが陽性, IgE-RAST score は猫毛4, 犬毛3, ハウスダスト3であった. 猫毛抗原による吸入誘発試験を施行したところ二相性喘息反応を呈した. 以上より猫毛による気管支喘息と診断し, 猫を遠ざけた生活を指導し良好なコントロールが得られている. 我々の知る限りでは, 我が国での猫毛, 猫毛皮屑による気管支喘息の報告は少なく, また二相性喘息反応を呈した報告例は認めない. 猫毛による気管支喘息の臨床像とともに, 特に二相性喘息反応での臨床的, 肺生理学的変化について報告した.