著者

垣見 俊弘 松田 時彦 相田 勇 衣笠 善博

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.55, no.4, pp.389-406, 2003-03-15 (Released:2010-03-09)

参考文献数

49

被引用文献数

9

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A new seismotectonic province map of the Japanese Islands and the adjacent areas, which carries maximum magnitudes of earthquake (Mmax) expected for the individual provinces, has been prepared as a revised edition of Kakimi et al. (1994). The major part of the mapped region constitutes an island arc-trench system, which is surrounded by Northwest Pacific Basin (1), Shikoku Basin (2), Philippine Basin (3), Kurile Basin (4), Japan Sea Basins (5), and Korean Peninsula and Tonhai Continental Shelf (6). All of the peripheral provinces have too low seismicity to be given Mmax. The island arc-trench system is subdivided into the following constituent arcs: Kurile Arc (7), Northeast Honshu Arc (8), Izu-Bonin Arc (9), Southwest Honshu Arc (10), Ryukyu Arc (11), Sakhalin Arc (12), and the Tectonic Belt along the Eastern Margin of Japan Sea (13). While the constituent arcs 7 to 11 are divided into three tectonic belts, which remarkably differ from each other in tectonic, seismic, and volcanic activities, from the trench to the inland: Continental Slope on the Trench Side (A), Non-volcanic Outer Belt (B), and Volcanic Inner Belt (C), the constituent arc 10 alone has additionally the Continental Slope on the Marginal Sea Side (D). Province 12 started developing in Late Mesozoic and functioned as a collision belt between the North American Plate (NA) and the Eurasian Plate (EUR) in Late Cenozoic, whereas province 13 is considered to form a current collision belt between NA and EUR plates. Province 11X, Okinawa Trough, is defined as a current rift zone developing between the Tonhai Continental Shelf and the Ryukyu Arc. Some of the provinces are further divided into subprovinces in response to local differences in active faults, seismicity, Mmax etc.All the active faults on land are grouped into seismogenic faults (Matsuda, 1990), which are considered to generate characteristic earthquakes. The magnitudes of earthquake expected for the seismogenic faults (MLmax) are estimated by the equation: log L=0.6ML-2.9 (Matsuda, 1975), where L is the length of the faults in kilometers. The maximum magnitude of earthquake expected for seismogenic faults (MLmax) and the maximum one for historical shallow earthquakes (Mhmax) are compared in each province to choose the larger one as the expected maximum earthquake magnitude (Mmax) for the province. Since no method to decide a seismogenic unit from offshore active faults has been established, Mhmax is tentatively adopted as the Mmax representing the province. Extraordinarily long faults found in inland provinces, which are called the designated faults (Matsuda, 1990), are excluded from estimation of the Mmax. None of the magnitudes of earthquake expected for the designated faults is shown here, because they should be individually estimated. All of the information, such as tectonic geomorphology and geology, characteristics of active (seismogenic) faults, historical earthquakes, modern seismicity, and other, is put into a table to facilitate the identification of a seismotectonic province and the determination of the Mmax and the designated faults. The details of the boundaries between seismotectonic provinces are shown in another table.

著者

日本地学史編纂委員会東京地学協会 今井 功 石山 洋 垣見 俊弘 黒田 和男 谷本 勉 八耳 俊文

出版者

公益社団法人 東京地学協会

雑誌

地學雜誌 (ISSN:0022135X)

巻号頁・発行日

vol.105, no.2, pp.215-237, 1996-04-25

参考文献数

173

被引用文献数

6 1

著者

藤澤 正視 垣見 俊弘

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.67, no.560, pp.109-114, 2002

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Machu Picchu is undoubtedly the most famous ruins of the Inoa Empire. It is located northwest of Cuzco, the former capital of the Inca Empire, and east-southeast of Lima, the current capital of the Republic of Peru. The ruins are located at a narrow ridge (N15 W) between Mt. Machu Picchu (elev. 3060m) on the south and Mt. Huayna Picchu (elev. 2660m) on the north. The site has been investigated by a Japanese mission comprised of experts on archeology, city planning, structural engineering and seismic engineering, seismology, geology and soil engineering. The results of topographical and geological investigations of the site indicate: 1. Construction of the ruins took advantage of topographical conditions but large-scale reconstruction is not feasible. 2. The base rock of the site consists of granite. Insitu construction used materials from the local base rock. 3. Colluyial soils exist on gentle slopes. Current condition suggests that they were recently formed. ' 4. As long as there is not a great earthquake or especially heavy rainfall, there is little probability that serious damage will occur from the foundation.

著者

湊 正雄 橋本 誠二 陶山 國男 武田 裕幸 鈴木 淑夫 木村 昭二 山田 一雄 垣見 俊弘 市川 輝雄 末富 宏

出版者

日本地質学会

雑誌

地質學雜誌 (ISSN:00167630)

巻号頁・発行日

vol.60, no.708, pp.378-387, 1954-09-25

被引用文献数

2 3

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Die machtige permische Formation des Setamai-Gelandes im Kitakami-Gebirge ist in zwei Subsystem teilbar; das obere ist das Toyoma-Untersystem, das lithologisch meistens aus Tonschiefern und granitfuhrenden Konglomeraten besteht und verhaltnismassig fossilarm ist, wahrend dagegen das untere Untersystem, d., i., das Yukisawa-Untersystem, ortlich sehr reich an kalkigen Tonschiefern bzw., Kalkschichten ist und bestehend fossilfuhrend., Hinsichtlich der vielen Gliedrungstiere kann das Yukisawa-Uutersystem wieder in zwei Serien gegliedert werden, in die Sakamotosawa- und Kanokura-Serie., Wir sind dabei der Ansicht, dass eine stratigraphische Lucke zwischen beiden vorhanden ist., Die wichtigsten Ergebniss in Bezug auf die Dauerzeit der Gattungen bzw., Spezies sind folgende: 1., Pseudoschwagerina erscheint bald nach dem Basiskonglomerat der Sakamotosawa-Serie und dauert bis zur J_0 Horizonte (Siehe Abb., 2)., 2., Dagegen erscheint Parafusulina in der I_2 Horizonte und dauert bis zur L_0., 3., Lepidolina zeigt eine Dauerzeit zwischen L_0 und L_1., 4., Lophophyllidium suetomii MINAT0 sind die wichtigen Gliederungstiere der I_0 Horizonte; Yatsengia Kabayamensis MINATO und Michelinia (Michelinopora) multitabulata YABE et HAYASAKA tritt besonders in der Horizonte J_1 auf; Waagenophyllum indicum var., usuginuensis MINATO, Wentzelella kitakamiensis YABE et MINATO charakterisieren die Horizonte L_0., 5., Die sogenanten Lyttonia-Faunen HAYASAKAS trenten nur im unteren Teile der Kanokura-Serie auf.,