著者

Minakami Takeshi

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.17, no.3, pp.590-623, 1939-09-20

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昭和12年11月27日に初まつた白根火山の爆發は昭和13年2月迄に最も著しい活動をなし,以後やヽ平靜となつたが,9月下旬より再び多少の活動を示し,10月5日にやヽ著しい爆發が起り,以後今日(昭和14年2月)に至るも未だ平穩とならず,多量の瓦斯の噴出と共に湯釜附近に火山灰を散布する狀態を示して居る.今回の爆發は總べて湯釜内の略中央を東南より西北に向ふ直線狀の裂罅に沿ふて發生した.昭和7年10月に發生せる爆發群とはその地表に於ける位置の上からは別個の裂罅上に發生せるものである.

著者

Seazwa Katsutada Kanai Kiyoshi

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.14, no.4, pp.525-533, 1936-12-21

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五重塔が見たところ細長いのに拘らず耐震性があるために以前から多くの人の注意をひいた.例へば大森博士の數多くの振動測定や武藤博士の推論などはそのあらはれであるとしてもよい.耐震性のある理由として或人は心柱が振子の作用と鉛直壓力とを與へるからであるといひ,他の人はその構造上から材料を破壊しないけれども構造や基礎の振動減衰摩擦が多いからであるとしてゐるが,何れも研究して見れば見る程これ等の特異性がわからなくなるものである.

著者

津屋 弘達

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.16, no.1, pp.171-200, 1938-03-20

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Nii-sima, situated abjut 40 km SW. of Volcano O-sima, in 34°23'N. and 139°15'E., is a volcanic island measuring about 11 km in a N.-S. direction and 2.5 km E.-W. It consists, like Kozu-sima, of several Quaternary liparitic volcanoes, besides the ruin of a basaltic volcano, of which the Mukoyama volcano in the southern part of the island is the youngest as well as the largest. The rocks constituting the liparitic volcanoes are grouped under three main headings―hornblende-plagioliparite, hornblende-biotite-plagioliparite, and biotite-plagioliparite―in order of eruption. Thus the structural scheme of the island, together with the rock-types represented may be summarized as follows: 1. Lavas forming the lowest visible part of Nii-sima (hornblende-plagioliparite)…{Seto-yama lava. Minezi lava. Zinaka-yama lava. Daisan-yama tuff and tuff-breccia (juvenile ejecta: hornblende-plagioliparite). Simawake-zawa tuff (juvenile ejecta: hornblende-plagioliparite). 2. Akasakino-mine volcano (hornblende-plagioliparite)…{Akasakino-mine lava. Akasakino-mine ejecta bed. 3. Niisima-yama volcano (hornblende-biotite-plagioliparite)…Niisima-yama lava. Marusima-yama volcano (hornblende-biotite-plagioliparite)…Marusima-yama lava. 4. Wakago basaltic volcano (augite-oli ine-bytownite-basa't)…Wakago basaltic ejecta bed. 5. Miyatuka-yama volcano (biotite-plagioliparite)…{Habusi-ura ejecta bed. Miyatuka-yama lava. Miyatuka-yama ejecta bed. 6. Atti-yama volcano (biotite-plagioliparite)…{Awai-ura ejecta bed. Atti-yama lava. 7. Muko-yama volcano (biotite-plagioliparite)…{Siromama bed (Omine pumicecone). Muko-yama ejecta bed. Muko-yama lava.

著者

寺田 寅彦 宮部 直巳

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.10, no.1, pp.192-199, 1932-02-22

著者

齊田 時太郎

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.18, no.4, pp.692-697, 1940-12-30

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It is reported that there were earthquake-proof buildings called "Disin no Ma" in the mansions of some of the feudal lords of ancient Japan. Recently the author investigated a "Disin no Ma" that was in a good state of preservation in the site of tha Hikone castle. This building was constructed two hundreds and sixty four years ago. The design of this structure is very striking and worthy of note from the standpoint of present structural engineering. The author points out the gret value of the structure in studying the historical development of earthquake-proof construction in Japan.

著者

萩原 尊禮

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.17, no.3, pp.627-637, 1939-09-20

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A strong earthquake occurred in the neighbourhood of Ogasima, a small peninsula in Akita Prefecture, at 14 h 58m, May 1st, 1939. Shocks of the same magnitude occurred twice with an interval of 2 minutes. Several hundreds of dwelling houses in the peninsula were demolished and 29 persons killed. The damage was increased by the landslip caused by the earthquake. The number of houses demolished as the direct result of the earthquake shock are shown in Fig. 2.

著者

萩原 尊禮

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.16, no.4, pp.779-783, 1938-11-20

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A mud avalanche occurred at Mt. Tukuba, Ibaraki prefecture, on July 3, 1938. In flowing down the valley it swept away two wooden buildings and killed three men. The avalanche was caused by collapse of soil in the upper waters of the valley as the result of heavy rains. The velocity of the flow was estimated to be less than 10 meters per second.

著者

高山 威雄 鈴木 武夫

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.8, no.3, pp.364-374, 1930-09-09

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The present investigation is a statistical study on the relation between the sunspot activity and the destructive earthquakes in Japan (Formosa excluded) for 318 years from 1608 to 1925 (Fig.1). The method of this investigation is that, the number of destructive earthquakes which occurred for three years containing the year of snnspot maximum or minimum and the same in the other years, have been counted and reduced to the frequency in an equal duration, which at last were represented by the percentage frequency. Similarly, we calculated the earthquake percentage for five years of sunspot maximum or minimum

著者

齋田 時太郎

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.14, no.2, pp.307-317, 1936-06-05

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この地震は昭和11年2月21日午前10時8分頃起つたもので,被害程度よりすれば強震と言ふべき局部性地震であった.共の被害の比較的著しく現はれたところは,大阪府と奈良縣との境界附近の大和川の本支兩流域及兩府縣界をなす葛城山脈中の二上山麓であつた.筆者は地震直後數日に亙り被害各地を調査した。しかし被害輕微なりし故,復舊速かにして建物,墓石,燈籠等の震害の實相を見るのに不便な場合もあつた.これより各地め被害情況を述ベ,更に被害と地質及地形との關係について,若干の考察を下して見たい.A strong earthquake shock was felt on the boundary between Osaka and Nara prefecture at 10h 8m, on the 21st of February, Railway, telephone and other communication services were crippled for a time, while many buildings were damaged and a number of landslips reported, There were also same who were crushed to death under landslips and collapsed heavy walls. In this paper the writer remarked the following two interesting matters: (i) Damages to building are divided into two kinds, namely: in hard ground, heavy buildings were collapsed seriously, while in soft ground, old or loose buildings damaged, These facts already were pointed out by this writer in the great Kwanto earthquake, 1923, in the earthquake of north Musasi, 1931, and in the several earthquakes of Taiwan(Formosa), (ii) The topography in the district injured by this earthquake are simple and symmetrical, There are strictly contrast of the earthquake damages in orthogonal directions through the epicentre. From above these affairs, the writer proposed that the contrast of damages suggest the line of discharge of earthquake energy, especially in the such case of shallow hypocentre and of monotonous disturbances as this earthquake.

著者

Sezawa Katsutada Kanai Kiyoshi

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.17, no.4, pp.675-684, 1939-12-30

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地球の生成時代にあり得るかも知れぬ狀態即ち液狀核を包む瓦斯の中の溫度分布及び沸點の分布をn=1といふ特別の場合について計算したものはこの前の報告に示した通りである.今囘はn=∞の場合,即ち等溫狀態に相當する場合の計算を試みた.この狀態は具體的には殆ど考へ難い場合であるが後に試みるnの一般の場合の推移を知り得るといふ意味があるのである.計算の結果によれば,前囘のn=1の場合には瓦斯のある非常に高い所から金屬の雨が降るけれども,n=∞の場合には寧ろ低い所から降る傾向のある事がわかる.

著者

岸上 冬彦 永田 武 宮村 攝三

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.19, no.4, pp.628-646, 1941-09-30

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Detailed investigation of phenomena that accompany earthquakes is fundamental work in seismology. Unfortunately, however, we have not yet advanced to that stage where we could predict earthquakes, while the means at our disposal at present for studying them the instant they arrive are inadequate, particularly, in the case of destructive shocks near their epicentres, all that we can do being to study the aftershocks that are recorded on seismographs, which data are nevertheless very valuable. But there is much information besides that pertaining directly to the main shock, and it is this knowledge that the writers sought to obtain.

著者

山田 節三

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.12, no.1, pp.96-149, 1934-03-15

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The present paper embodies the results of the geological and petrological investigations of the volcanoes liduna and Kurohime. These volcanoes are situated at 138°10'E. long, and 30°40'N. lat. in central Japan; and are members of the My6k6 volcanic group, the representative volcano of which'Myoko-san, is considered by some geologists as the northern extremity of the so-called "Huzi volcanic zone".