著者

安里 進

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.3, pp.364-371, 1996-06-25

参考文献数

33

---

Is it possible that modern Ryukyuans are the descendants of Palaeolithic Minatogawa Man, and the people of the Shellmound Period, which is partially equivalentto the Jomon Period ? There is a blank period of about 10, 000 years between the Minatogawa population and the population of the Okinawan Shellmound Period. Sakishima prehistoric culture was one of the Southeast Asian prehistoric cultures until the beginning of the Heian Period. A dramatic cultural change occurred in Okinawa after the Shellmound Period, in the Gusuku Period, which began in the 10th to 11th centuries as a result of culturalinfluence from the Mediaeval Period of Kyushu. Darling 13th to 14th centuries the culture of the Gusuku Period also expanded into the Ryukyu Islands from Amami Islands to the Sakishima Islands, and there was a general rapid population increase. Modern Ryukyuans are descended from the populations of the Gusuku Period. Some geneticists and anthropologists insists that modern Ryukyuans possess hereditary blood factors found in northern Asian populations. It is suggested that those factors flowed into the Ryukyuan population in the Gusuku Period.

著者

青木 隆浩

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.109, no.5, pp.680-702, 2000-10-25 (Released:2009-11-12)

参考文献数

86

---

The sake brewers in advanced regions such as Hyogo, Aichi, and Saitama prefectures began innovations in brewing techniques to improve quality from 1890's. In contrast, the peripheral regions such as the Tohoku Area have long maintained traditional brewing techniques in order not to increase the cost of production. Therefore, the disparity in technological levels between regions expanded.Under these circumstances, the national government established the Brewing Research Laboratory to research and develop brewing techniques, which played very important roles in supporting sake brewers, as well as in promoting the introduction of new techniques to so-called peripheral regions in 1900's. They were adopted by many sake brewers in peripheral regions to make the production process easier than in the advanced region's. The interregional disparity diminished. Accordingly, the advanced regions lost their superiority in brewing technique.National sake competitions have been held since 1907. The brands produced in advanced regions lost prizes, while those in the peripheral regions won the event every year. The prizewinner was sweet, however, the others were pungent in flavor. Sweet sake was regarded as having high quality in the events.However, sweet sake has not become popular in the consumer market. Therefore, brewers in the peripheral regions could not expand their market shares. In addition, sake brewers in the advanced regions often held their own local sake competitions, and enhanced the infiltration of their brands into the markets. Taking sake brewers in Saitama Prefecture as an example, by producing sake with a somewhat light alcohol content, they could expand their market share.If sake's qualities were homogenized within a region, they could be easily differentiated from another region's sake. In the Kanto Region, the sake brewers in Saitama Prefecture homogenized the qualities of their brands; however, in Tochigi Prefecture the quality was so diverse that they could not be differentiated from other region's sake. As a consequence, sake brewers in Saitama gained more shares than Tochigi in the sake market.

著者

王 天天

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.129, no.1, pp.1-19, 2020-02-25 (Released:2020-03-17)

参考文献数

61

---

During the past few decades, China has experienced several institutional changes, which have provided a distinctive background for its urban spaces to restructure. In the planned economic era, despite the strong influence of the USSR, the unique “Danwei” system was created to reflect the state of affairs of the country. A Danwei or work unit is not only a place of employment, but also provides welfare benefits such as housing, education, and health care for employees and their families. Workplace, housing, and facilities needed for daily life are usually built inside one gated enclosure, a Danwei compound, which became the basic spatial unit of urban China. Such proximity between workplace and residence indicates that a clear suburban residential area in the Western sense had not existed during the pre-reform era. Thus, urban spaces were formed to a unique cellular structure, which distinguishes itself from not only models considered in Western cities, but also socialist cities in Eastern Europe. Following reforms and opening-up, the land market started to develop from the late 1980s. Spatial differences in land prices led to a massive shift in land use, including the relocation of low-profit factories away from city centers, and the emergence of central business districts in big cities. In the late 1990s, the commercialization of housing was promoted. Welfare housing allocated by Danwei has been converted into private ownership, and suburban areas started to spring up with the new construction of commoditized housing. Under this process, a separation between home and work started to take place in urban China. Thus, suburban residential areas in the Western sense, with residents commuting long distances to a city center, have finally come into existence. However, due to government regulations on the development of low-density detached housing, this emerging suburban growth is dominated by mid- to high-density collective housing developments. In this sense, it is inaccurate to claim that residents of suburban China changed their ways of living to the distinctive suburban lifestyles found in “typical” Western or Japanese suburbs.

著者

金尾 宗平

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.39, no.4, pp.213-218, 1927

著者

福井 幸太郎

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.111, no.4, pp.564-573, 2002-08-25

参考文献数

29

被引用文献数

2 2

---

A pit survey, near-surface ground-temperature monitoring, DC resistivity tomography, and an eighteen-year interval survey elucidate the internal structure and the recent movements of the active protalus rampart in the Kuranosuke Cirque, the northern Japanese Alps. Permafrost was found beneath the lower part of the protalus rampart by using ground temperature monitoring and DC resistivity tomography. The results of DC resistivity tomography suggest that the materials of the protalus rampart has a at least 15 m in thickness. Four targets placed on the lower part of the protalus rampart moved at mean horizontally rates of 2.4 to 7 mm a<SUP>-1</SUP> between 1983 and 2001. These displacements probably occurred due to permafrost creep and/or deformation in the lower part of the active layer.

著者

北村 修

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.99, no.6, pp.594-601, 1990-12-05 (Released:2010-02-25)

参考文献数

11

被引用文献数

3 3

著者

金光 玄樹 下條 将徳 平田 岳史 横山 隆臣 大藤 茂

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.889-909, 2011-12-25 (Released:2012-03-05)

参考文献数

65

被引用文献数

4

---

We measured the LA-ICP-MS U-Pb age distribution of detrital zircons in three psammitic schist samples of Hitachi and Nishidohira medium P/T metamorphic rocks from the southern part of Abukuma Belt, Northeast Japan. It has been proposed that these medium P/T metamorphic rocks mark the eastern extension of the Triassic collisional suture between the North China and South China blocks. Therefore, we aim to obtain the age of sedimentation, stratigraphy, and provenance of their protolith from the measurements, and evaluate the above proposition. The psammitic schist sample (DIO-9) of Hitachi Metamorphic Rocks, originating from quartzose sandstone at the lowest part of the Daioin Formation, contains detrital zircons of the youngest age clustered around 410 Ma and the youngest zircon at 395 ± 20 Ma (206Pb/238U age; 2σ). Considering that the upper part of the Daioin Formation contains Visean (Lower Carboniferous) corals and that the formation intercalates abundant felsic tuff layers, the lowest part of the Daioin Formation is likely to be correlated with Devonian Nakasato or Lower Carboniferous Hikoroichi Formation of South Kitakami Belt, Northeast Japan. Nishidohira Metamorphic Rocks lie beneath ultramafic rocks along the base of Hitachi Metamorphic Rocks, and consist of mafic, siliceous, calcareous, pelitic, and psammitic schists or gneisses. Because the siliceous schist of Nishidohira Metamorphic Rocks is meta-pelagic chert, the metamorphic rocks presumably originated from an accretionary complex. The ages of detrital zircons in two psammitic schist samples (ND-12 and -13) of Nishidohira Metamorphic Rocks mostly fall between ca. 300 Ma and 200 Ma, with the youngest two zircons at 154 ± 6 Ma (ND-12) and 175 ± 3 Ma (ND-13) (206Pb/238U age, 2σ). The protolith age of the psammitic schists must be ca. 154 ± 6 Ma (Kimmeridgian of Late Jurassic) and ca. 175 ± 3 Ma (Aalenian of Middle Jurassic) or younger, suggesting that Nishidohira Metamorphic Rocks originated from a Jurassic accretionary complex. In the Hitachi area three tectonostratigraphic units superpose, i.e., in ascending order, (1) the Jurassic accretionary complex of Nishidohira Metamorphic Rocks, (2) ultramafic rocks, and (3) Hitachi Metamorphic Rocks that are at least partly correlated with the Paleozoic sequence of South Kitakami Belt. The tectonostratigraphy is similar to that of non-metamorphic rocks of Kitakami Mountains, Northeast Japan, where (1) the Jurassic accretionary complex of North Kitakami Belt is overlain by (2) the Hayachine mafic–ultramafic complex, which in turn is overlain by (3) the Paleo–Mesozoic succession of South Kitakami Belt.

著者

副島 八十六

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.15, no.11, pp.840-857_1, 1903

著者

副島 八十六

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.10, no.9, pp.488-499, 1898

著者

副島 八十六

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.10, no.10, pp.531-542, 1898

著者

吉野 正敏

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.100, no.6, pp.891-909, 1991-12-05 (Released:2010-02-25)

参考文献数

87

被引用文献数

3 3

著者

三上 岳彦 財城 真寿美 平野 淳平 森島 済

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.127, no.4, pp.443-446, 2018-08-25 (Released:2018-10-05)

参考文献数

15

被引用文献数

1

著者

鹿園 直建

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.111, no.3, pp.360-373, 2002-06-25 (Released:2009-11-12)

参考文献数

31

被引用文献数

1

---

Previous studies such as that of Meybeck (1987) estimated the CO2 flux from atmosphere to riverwater due to chemical weathering by assuming that the rate of weathering of silicate rocks and carbonate rocks is proportional to the surface areas of rocks (silicate rocks : carbonate rocks = 7 : 3). However, the dissolution rate of carbonates (calcite and dolomite) is in two to four orders of magnitude higher than silicate (feldspar). This may imply that Meybeck's and other previous approaches lead to a large uncertainty in the estimate of CO2 flux. However, their estimates are nearly similar to that of Gaillardet et al. (1999), who estimated the contribution of the weathering of silicates and carbonates to riverwater chemistry based on a large volume of analytical and runoff data of the world's 60 major rivers.The thermochemical calculation in the present study indicates that the chemistry of riverwater having a small runoff is controlled by the solubilities of calcite and Na ·Ca-feldspar (Na : Ca = 1 : 1) at atmospheric PCO2 (10 -3.5 atm) and the world-wide average riverwater chemistry plot is close to the Na ·Ca feldspar-calcite-riverwater equilibrium point. This result reasonably explains the similar estimated values of CO2 flux obtained by Meybeck (1987) and others and Gaillardet et al. (1999).The conditions for riverwater saturated with Na ·Ca feldspar and calcite were derived based on a dissolution kinetics-fluid flow coupling model and were expressed as functions of τ (residence time of groundwater) and A/M (A : surface area of mineral, M : mass of water).

著者

LePichon Xavier 飯山敏道 RENARD Vincent 中村 一明 CADET Jean-Paui 小林 和男

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.93, no.7, pp.442-454, 1985

著者

LePichon X. 飯山 敏道 PAUTOT G. 中村 一明 CADET J. P. 小林 和男

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.94, no.7, pp.636-647, 1986

著者

平野 弘道

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.112, no.3, pp.429-430, 2003-06-25

参考文献数

8

著者

松野 太郎

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.100, no.6, pp.881-890, 1991-12-05 (Released:2009-11-12)

参考文献数

6

被引用文献数

1

著者

中埜 貴元 小荒井 衛 宇根 寛

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.124, no.2, pp.259-271, 2015-04-25 (Released:2015-05-14)

参考文献数

23

被引用文献数

5 8

---

Landform classification data are useful for assessing land liquefaction. Koarai et al. (2013) suggested a comprehensive risk assessment table for land liquefaction by combining 7.5-arc-second Japan engineering geomorphologic classification data (Wakamatsu and Matsuoka, 2009) with seismic intensity. The Geospatial Information Authority of Japan (2007) suggested a risk assessment standard for land liquefaction using land condition data produced by the Geospatial Information Authority of Japan. Our new hazard assessment standard for land liquefaction is based on land condition data and a risk assessment table produced by Koarai et al. (2013). Furthermore, a landform classification and hazard assessment standard of land liquefaction is suggested to create a simple land liquefaction hazard map. This information allows land liquefaction hazard to be assessed from land condition data or 7.5-arc-second Japan engineering geomorphologic classification data and to interconvert both land liquefaction hazard assessments.

著者

浅川 忠

出版者

Tokyo Geographical Society

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.102, no.6, pp.708-714, 1993-12-05 (Released:2010-11-18)

参考文献数

18

著者

小藤 文次郎

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.14, no.7, pp.467-478, 1902