著者

宮部 直巳

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.60, no.2, pp.53-56, 1951-06-30 (Released:2009-11-12)

参考文献数

7

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Herewith the crustal deformations as revealed by means of precise geodetic surveys are discussed in connection with the crustal deformations revealed as the results of topographical observations, based on the theory of isostasy.With regard to the crustal deformations found by geodetic methods, it is pointed out that the acute crustal deformations which might have accompanied the destructive earthquake is seen as occurred in reverse direction against the pre- or post-seismic chronic crustal deformations.It is also pointed out that the mode of the acute crustal deformations is such that the earth's crust rises where the gravitational anomalies are positive and vice versa, and that the mode of crustal deformations found as the results of topographical observations seems to agree with that of the acute crustal deformations.

著者

山下 傳吉

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.10, no.2, pp.83-86, 1898-02-20 (Released:2010-10-13)

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.27, no.7, pp.619-621, 1915-07-15 (Released:2010-12-22)

著者

福岡 義隆

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.102, no.2, pp.119-124, 1993-04-25 (Released:2010-11-18)

参考文献数

18

被引用文献数

1 1

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Informations on the cold weather and climatic disasters during part of the Little Ice Age for 17th to 18th Century in Japan were obtained from tree ring widths and some kinds of historical documents.Tree rings were analyzed both at Northeastern Japan (Fukushima Pref.) and Southwestern Japan (Okayama Pref.) mostly in Shinto Shrines' precincts. The daily weather records described in old personal documents such as diaries were inquired into at Hirosaki City (Aomori Pref.) for Fukushima's tree rings and at Tsuyama City (Okayama Pref.) for Okayama's tree rings. In this study, the snowy days' rate is used as an indicator of winter coldness. It is defined as the percentage of the number of days with snowfall to that with precipitation, that is, the total of rainy and snowy days.As a result, it could be concluded that the tree ring widths are narrower in the year of larger snowy days' rate. In Southwestern Japan, it is also considered that the drought summer as well as coldest winter caused the worse growth of trees.

著者

田中館 秀三

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.38, no.7, pp.374-390, 1926-07-15 (Released:2010-10-13)

被引用文献数

3

著者

田中館 秀三

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.38, no.3, pp.130-135, 1926-03-15 (Released:2010-10-13)

被引用文献数

1

著者

田中舘 秀三

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.38, no.4, pp.188-201, 1926-04-15 (Released:2010-10-13)

被引用文献数

1

著者

田中舘 秀三

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.38, no.6, pp.324-329, 1926-06-15 (Released:2010-10-13)

著者

菊地 俊夫 岩田 修二 渡辺 真人 松本 淳 小出 仁

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.120, no.6, pp.Erratum6_1-Erratum6_1, 2011-12-25 (Released:2012-01-28)

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地学雑誌120巻5号(2011)掲載の菊地俊夫・岩田修二・渡辺真人・松本 淳・小出 仁著「特集号『ジオパークと地域振興』―巻頭言―」(p.729-732)に誤りがありましたので,お詫びし訂正いたします。p.731 右段最終行:(誤)尾形 → (正)尾方

著者

豊蔵 勇 岡田 篤正 牧野内 猛 堀川 義夫 長谷川 淳

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.108, no.5, pp.589-615, 1999-10-25 (Released:2009-11-12)

参考文献数

31

被引用文献数

1 2

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Construction of the Chubu International Airport has started off Tokoname City (Chita Peninsula) in Ise Bay. Various surveys such as bathymetry, seafloor drilling, sonic prospecting, and geologic examinations of recovered borehole core samples, have been performed to reveal soil engineering characteristics, submarine topography, and submarine geology at the airport site (Chubu Kuukou Chousakai=The Chubu International Airport Research Foundation, 1994). Many fruitful results on the submarine geology have been obtained in these surveys, as follows : (1) The submarine topography is divided into the inshore “Upper submarine terrace”, “Offshore gently sloping sea floor”, and “Submarine scarp” between the two. A submarine channel is trenched southwards on the inshore submarine terrace.(2) The bay area is underlain by the A, B, C1, C2, and T Formations, in descending order. The T Formation is Mio-Pliocene Tokoname Group, the basement of the bay area. The Tokoname Group forms a buried wave-cut platform of a peninsular shape, which extends southwards. On the east side of the peninsular wave-cut platform, a submarine buried valley stretches southwards under the submarine channel and is mostly filled with the A Formation. On the west side of the wave-cut platform runs the Ise Bay Fault, and the A, B, C1, and C2 Formations thicken offshore.(3) The A Formation, which is divided into the A1 (upper), A2 (middle), and A3 (lower) Members, consists of marine muddy strata of the present bottom surface and is correlated with the Nanyo Formation below the Nohbi Plain (north of the Ise Bay). The A Formation is 25 to 35 meters thick, and the 14C ages range from 9, 400 to 5, 200 y. B.P. of Holocene age.The A3 and A2 Member intercalates the U-Oki and K-Ah tephra, respectively, both are widespread tephra layers in Japan.(4) The B Formation, which is divided into the B1 (upper), B2 (middle), B3 (lower), and B4 (base) Members, consists of sand beds and gravelly beds. The B1, B2, and B3 Members are correlated with the Nohbi and First Gravel Formations below the Nohbi Plain, respectively. The B4 Member forms a buried terrace on the west slope of the peninsular wave-cut platform and is correlated with the Toriimatsu or Ohzone Formations, Lower Terrace Deposits in the eastern margin of the Nohbi Plain. The B Formation is of late Pleistocene age.(5) The C1 Formation consists mainly of marine clay beds about 40 meters thick. The fossil pollen composition indicates that the C1 Formation is correlated with the lower part of the Atsuta Formation in the Nohbi Plain and is of middle Pleistocene age.(6) The C2 Formation consists of sand (upper) and gravelly (lower) beds and exceeds 50 meters thick. The fossil pollen composition indicates that the C2 Formation is correlated with the Ama Formation below the Nohbi Plain and is of middle Pleistocene age.(7) The basement T Formation (Tokoname Group) consists of alternating sand and compact mud beds and intercalates two volcanic ash layers, which are correlated with the Souri (upper, Sr) and Higashitani (lower, Hg) Volcanic Ash Layers from the conformity in index of volcanic glass. The Souri and Higashitani V. A. Ls are intercalated within the upper horizon of the Tokoname Group in the Chita Peninsula.(8) The Ise Bay Fault (faults and flexure zone), trending in the NNW-SSE direction, extends in the western margin of the bay area. The Tokoname Group on the east side of the fault trends northwest and gently dips northeast. The Utsumi Fault, trending in the WNW-ESE dircction, extends in the southern margin of the peninsula.The geological relationship between the Chita Peninsula and airport site in the above-mentioned results brings the following problems for further study.

著者

松原 秀樹

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.58, no.4-5, pp.179-180, 1949-07-30 (Released:2009-11-12)

著者

中野 尊正

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.72, no.6, pp.321-321, 1963-12-30 (Released:2009-11-12)

著者

柏木 洋彦 鹿園 直建

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.112, no.4, pp.473-488, 2003-08-25 (Released:2009-11-12)

参考文献数

85

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Climate change and variations of atmospheric CO2 during Cenozoic have been discussed by many studies. The model results for global carbon cycle and climate change are generally consistent with those of many analytical studies concerning climate events in early Cenozoic, e.g., early Eocene warming events. However, the climate events proposed by analytical studies in late Cenozoic are not wholly inconsistent with the results of the model studies, e.g., Miocene climatic optimum (warming), cooling events in Eocene/Oligocene boundary and middle Miocene (15 Ma). Many problems remain in relation to evaluating CO2 flux by hydrothermal solutions at mid-ocean ridges, island-arc, and back-arc basins in the models. Also, the discrepancy may be derived from errors in estimating weathering flux, organic carbon burial, and change in vegetation. Moreover, another greenhouse effect gas such as methane, land-sea distribution, albedo variations due to the formation of ice-sheets, and temperature distribution attributed to changes in the ocean circulation system should be considered. Recent analytical studies reveal that the CO2 level since Miocene has remained relatively low in spite of the suggested climate events in this period. The mechanism of oceanic environmental change, as well as atmospheric CO2, is especially important to elucidate climate change during Cenozoic.

著者

若林 芳樹 小泉 諒

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.123, no.2, pp.249-268, 2014-04-25 (Released:2014-05-16)

参考文献数

53

被引用文献数

8

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This study examines the spatial patterns of population change in the 23 Special Wards of Tokyo after the period of the bubble economy in the late 1980s. To this end, we analyze grid square data suitable for time-series analysis between 1985, when the bubble economy started, and 2005, the latest year for which data are available, using the geographic information system (GIS). After selecting major indicators representing three dimensions of the social area analysis—family status, socioeconomic status, and ethnic status—we map each indicator and make quantitative comparisons of six zones, classified by distance from the city center, and of four sectors classified by direction from the city center. The indicators used in this study are three variables representing family status (ratio of young population, ratio of elderly population, and ratio of single-person families), three variables representing socioeconomic status (ratio of blue collar workers, ratio of managers and officials, and ratio of professional and technical workers), and one variable representing ethnic status (ratio of non-Japanese people). Before analyzing these data, we examine the spatial pattern of population change in the 23 Special Wards between 1985 and 2005. This analysis reveals that a population recovery has occurred since the latter half of the 1990s in central Tokyo, where a previous population decline had continued until 1995. On the basis of this trend of population change, we examine the spatial pattern of each indicator in the social atlas. Concerning age and household composition (representing family status), spatial distribution has gradually shifted from a zonal pattern to a sectoral pattern due to the migration of nuclear families to the area surrounding the city center. The spatial distribution of socioeconomic status represented by the occupational structure maintained a sectoral pattern characterized by a contrast between the eastern and western parts of Tokyo although this distinction has blurred. In particular, the number of managers and officials in the 23 Special Wards has decreased, and the distribution shifted to a zonal pattern, which indicates a polarization of white-collar workers. The distribution of non-Japanese shows a zonal pattern in which the highest value appears in the area surrounding the city center. However, spatial autocorrelation analysis of the distribution of four major ethnic groups by nationality reveals a clustered pattern, supporting the findings of previous studies in Western countries.

著者

吉田 明夫 高山 博之

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.103, no.6, pp.696-705, 1994-12-10 (Released:2009-11-12)

参考文献数

13

被引用文献数

1 1

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We show that seismic activity decreased clearly in a wide area before the 1953 Boso-oki earthquake and the 1972 Hechijojima-toho-oki earthquake. In both cases the seismic quiescence extended to the Tokyo Metropolitan area. Marking precursory activity appeared several years before the Boso-oki earthquake in the Chiba prefecture and in the sea region off-Ibaraki prefecture. It is also noted that the seismicity in the Kanto region as well as in the sea region south off-Boso Peninsula decreased conspicuously after the Boso-oki earthquake. On the contrary an increase of the seismicity was observed after the Hachijojima-toho-oki earthquake, although deep seismic activities decreased remarkably. We show that seismic quiescences preceding the Boso-oki earthquake and the Hachijojima-toho-oki earthquake were detectable before their occurrences, and no other statistically significant quiescence has appeared in the south off-Kanto region since 1926. It is proposed that the occurrence of a large earthquake may be predicted by monitoring changes of the seismicity in a wide area.

著者

武村 雅之

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.108, no.4, pp.440-457, 1999-08-25 (Released:2009-11-12)

参考文献数

47

被引用文献数

2

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Immediately after the 1923 Kanto Earthquake (M=7.9), two large aftershocks of M=7.2 and 7.3 occurred in succession somewhere in the southern Kanto district. The first aftershock occurred about 3 minutes after the main shock and the second about 4.5 minutes after the main shock. Strong ground motions from these events and locations of their epicenters were examined mainly from data of 548 descriptions of personal experiences. It was deduced from them that shaking due to the first aftershock was severe in the Tokyo Metropolis and eastern Kanagawa prefecture. In consequence, there were many descriptions in the Tokyo Metropolis that the shaking was as strong as that due to the main shock and caused extensive damage.On the other hand, there were few descriptions for the first aftershock in the western area of the southern Kanto district, which is western Kanagawa prefecture, Yamanashi prefecture, and eastern Shizuoka prefecture. However, shaking due to the second aftershock was strong in this area. Some people living near the boundary of the three prefectures described that its shaking was as strong as that due to the main shock. Comparing the facts described in these personal experiences with the distributions of seismic intensities from other M=7 class earthquakes occurring in the southern Kanto district after the 1855 Ansei Edo Earthquake, it was concluded that the epicenter of the first aftershock was located in and around northern Tokyo Bay and that the epicenter of the second aftershock was in eastern Yamanashi prefecture. The result for the second aftershock was consistent with the epicenter determined from the seismic records by the Kumagaya Meteorological Observatory and with the epicentral distance estimated from data of S-P time at the Gifu Meteorological Observatory. The characteristics of the sequence of strong shakings within 5 minutes after the 1923 Kanto Earthquake could be elucidated in the southern Kanto district from the results of the present study.

著者

青木 健一

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.111, no.6, pp.849-855, 2002-12-25 (Released:2009-11-12)

参考文献数

30

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Aspects of cultural transmission in humans are reviewed with special reference to evidence for and against vertical (parent-to-child) and non-vertical transmission. Henrich's (2001) model of biased horizontal transmission may satisfactorily account for the S-shaped adoption curves (e.g., for the spread of hybrid seed corn). The demic expansion hypothesis for the spread of early farming in Europe (Ammerman and Cavalli-Sforza, 1971, 1973) is reevaluated in the light of new theoretical results (Aoki et al., 1996). Hewlett et al.'s (2002) test of the demic expansion, acculturation, and cultural-materialistic hypotheses on 36 African ethnic groups is described.

著者

越谷 賢 丸井 敦尚

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.121, no.3, pp.421-440, 2012-06-25 (Released:2012-07-09)

参考文献数

38

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Three-dimensional earth sciences information is being made available in digital formats because such information is useful and understandable to various users. In this study, we develop a three-dimensional hydrogeological model of Tsukuba City and the surrounding region, and develop a method for estimating the hydraulic conductivity of aquifers in combination with the three-dimensional hydrogeological model and other related hydrogeological information with the primary objective of proposing a method for evaluating groundwater resources. The three-dimensional hydrogeological model was developed using a geological map and drilling data with data interpolated using a geostatistical method. The model developed reproduced the data used well, and it was found to be accurate for practical use. Moreover, this model could be used for various types of visualization, from which information could be extracted and applied immediately to numerical simulations; this provided information that was useful and understandable for evaluating groundwater resources. The proposed method for estimating the hydraulic conductivity of aquifers was developed from hydraulic conductivities obtained from various drilling surveys, which were grouped together taking geology and stratigraphy into consideration based on a three-dimensional hydrogeological model, and using a statistical analysis. This method can be used to rapidly evaluate trends in hydraulic conductivity by integrating data distributed over a broad area. In addition, if a columnar section of an evaluated point is obtained, this method can be used to determine the actual hydraulic conductivity of aquifers. Therefore, these methods were found to be effective for evaluating groundwater resources.

著者

福井 篤

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.73, no.1, pp.1-10, 1964-02-29 (Released:2009-11-12)

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今日, 雪氷学と称せられる分野において, 氷の結晶の問題から, 積雪・融雪の物理学的問題に至るまで, 学問的体系をととのえてきたのは, 最近ほぼ10年位の進歩によるものであろう。氷の結晶, 雪の結晶及び降雪現象については, 雲物理学の進農も含めて純基礎的学問の分野で進められてきたが, 積雪現象については, 従来主として応用科学的に取扱われ, 特に産業分野における防災対策上の問題として研究が進められてきた。特に, 多雪による大災害の発生を見ると急速にその対策研究が要望され, 昭和9年, 11年, 15年等の大雪年の際は, 農林業・鉄道などの被害が大きく, これらの分野では, 積雪による直接災害に対する対策に必要な調査研究が個々に行なわれるようになった。戦後に至ってやや暖冬の傾向にあった時期においては, 雪に対する研究調査の必要性は, 世間的に認められるところではなかったが, 産業構造の発展によって, 各分野における積は的な対策研究が進められたほか, 積雪現象の純学問的な取扱いがなされるようになってきた。近年に至り, 両者の歩み寄りが次第に深まりつつあるときに当って, 昭和35~36年の新潟における豪雪, そして今回の北陸地方から西日本一帯を襲ったいわゆる38。1豪雪となった。従来の産業分野における十数年にわたる対策研究も相当の効果があったにもかかわらず, 再度大災害をまねく結果になった。このため, 雪害対策について再び大きな話題を呼び, 多くの対策研究の再検討と同時に雪 (この場合降雪積雪現象を対象として) そのものに対する基礎的研究の必要性が論ぜられるようになった。しかしこのことを論じるに当っては, 特に38.1豪雪に際しての災害の実態が何であったか, また今日の雪に関する基礎的研究がどのような現状にあるかを見はめなければならないであろう。38.1 豪雪による災害の実態については, 各方面で調査が試みられ, それぞれの分野における被害の様相が発表されているものもあるが, 相互の関連性についての究明がなされていない面もあり, 真の意味の災害の様相がつかみにくい。また一方一般的に雪害というものがどのような形態で発生するかについてもいままで総合的に調査されたものが少なく, 社会科学に立った対策に至っては全く未開発の問題にもなっている。これらの点も考えて, 現在雪国のおかれている地理的社会的条件と雪との相互関係及びこの問題を解決する基礎的な雪そのものに関する研究との連繋について考える必要があろう。このような意味において, 雪に関する研究調査の現況と問題点を述べてみたいと思うが, 積雪学という立場における理論的発展過程については, 本誌の吉田順五先生によって詳しく述べられておるので, ここでは, 主に雪害の防災的見地に立って述べることにしたい。

著者

金 枓哲

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.121, no.5, pp.815-823, 2012-10-25 (Released:2012-12-05)

参考文献数

17

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This study reviews current trends and issues in geography and geography education in Korea. The first geographers' society was established in 1945 after the country was liberated from Japan. Despite its short history, geographical studies in Korea have sharply increased during the last 60 years. Against this background, the features of geographical studies in Korea can be summarized as follows: first, geography in Korea was required to emphasize its character as a science of the nation until the 1980s due to its geopolitical situation. Since the 1990s, however, the mainstream of geography in Korea has focused on area studies in other countries. This is partly due to the globalization of the Korean economy and an increase in the number of geographers studying abroad, especially in the United States. It should also be noted that radical geography has contributed to the linearization of Korean society since the 1980s.