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Volume 1965 (1965)
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Volume 1965, Issue 78
Displaying 1-8 of 8 articles from this issue
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Kitaichiro OMACHIArticle type: Article
1965 Volume 1965 Issue 78 Pages ii-iii
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (267K) -
Lower Pleistocene Valcanics in northern Fossa MagnaJunji TAKEUCHI, Hisashi TAKESHITAArticle type: Article
1965 Volume 1965 Issue 78 Pages 1-10
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSIn the last Sarumaru stage in the early Pleistocene, volcanic activities in Nagano district of the northern Fossa Magna district produced various kinds of volcanic rocks and their pyroclastics, ranging from high-alumina basalts, through tholeiitic basalts and andesites to calc-alkalic andesite and rhyolites. Since they formed the basement of Iizuna Volcano, and were also very intimately related with it, they are called here the Paleo-Iizuna volcanics. Similar volcanics are also distributed to the north-east of Iizuna volcano, thus forming the basement of Madarao Volcano. Their stratigraphic relation with the Sarumaru formation and Toyono formation, and their geologic significance are discussed in detail.View full abstractDownload PDF (1764K) -
Shoji FUJIIArticle type: Article
1965 Volume 1965 Issue 78 Pages 11-20
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSThe late Quaternary deposits in the Kurobe river mouth were laid down in relation to the change of the sea level. From geology of this fan and the adjacent area, the nature, distribution, depositional history and the volume of this fan deposits were made clear. More than 4.4 km3 of deposits have been carried in the sea by the Kurobe river since the beginning of the post glacial age. This mass has been deposited within 110 km2 area of the fan and adjacent portion of the continental shelf. There are several submarine forests around the Toyama bay. The stage of the forests is from the late Jyomon to the early Yayoi, judging from the age of the peat beds around them. And this fact has shown that the sea level was 0〜-2 m below the present sea level at that time and the east part of the Toyama plain has upheaved and the center of it has sunk in the vertical earth movement.View full abstractDownload PDF (1823K) -
Masao MINATO, Yoshiki FUJIWARAArticle type: Article
1965 Volume 1965 Issue 78 Pages 21-22
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
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Jiro HIRAYAMA, Toshihiro KAKIMIArticle type: Article
1965 Volume 1965 Issue 78 Pages 23-31
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSUsing the minor-faults, M.V. GZOVSKII (1954) first proposed an analytical method for determining the stress-field caused by the tectonic movement. In the present paper his method is introduced, and its applied examples, which the writers actually verified at the sedimentary strata developed in the Miura Peninsula, are reported. At Sajima, the stress-field restored from the conjugate minor-faults well coincides with theoretical or experimetal one found on the anticlinal crest of plastically deformed strata. At the cape Choja-ga-saki, two sets of conjugate minor-fault groups, the older reverse-fault set and the younger normal-fault set, are recognized. The stress distribution obtained from the younger set (PL-I-2) is snch that the axes of maximum principal stress σ1 (where tension is treated as plus) have always a constant direction (E-W, near horizotal) and σ2 and σ3 axes, on the contrary, take rather random orientation on the planes perpendicular to σ1 axes. From the fact the writers concluded that the younger faults were generated by a tensile stress caused by a general upheaval of this area. From the writers' observations followings are emphasized: 1) it is important to distinguish each set of fractures at each locality. 2) it is much useful to find the axes of princi pal stress from one or a few pairs of fractures at many points, rather than to find those from the mean value of numerous fractures at a few points.View full abstractDownload PDF (1990K) -
Seiji SUDO, Isamu HIGASHIYAMAArticle type: Article
1965 Volume 1965 Issue 78 Pages 32-38
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESS1. Coulomb's Eq.(1) is generally used to solve the equiblium equations of traction in soil. Such Coulomb's equation as is based on frictional phenomena could not be applied to all cases of mechanical behaviors. Soils, except sandy soil, in ordinary conditions are signified as viscoelastic bodies, which written in the form (Burgers' model) e=P0/G1+P0t/η1+p0/G2 [1-exp(-t/τυ)] where τυ, is time of retardation, and visualized with mechanical models in Fig. 13. For example, the model constants of the soil at pF=2.0 are showed in page 34. The flow of soil paste in the range of -1.5 < pF <1.5 is written in the form of Eq.(10), in which thixotropy flow generally occures. 2. Energy concept of soil water was studied by Schofield or Derjaguin which are written in the form of Eq.(12). In mechanical phenomena external force pe is equivalent to phase pressure, to soil water and equals to p in υΔp=Δμ, where μ is chemical potential of soil water. Therefore mechanical properties of soil is classified from the view-point of pF as showed in the Table (page 35). 3. Ultimate bearing strength of ground or foundation and trafficability of vihicles correspond to yield value θ of Bingham model linked in series to Burgers model. It is very useful in practical engineering that log θ is equivalent to pF value. Such mechanical constants as elasticity G and viscosity η are reduced in order of the increase of external force. The behavior of land slide may be treated as plastic flow (Eq.10). In the case of earthquake, ground surface of back marsh is suffered from thinning action and differential settlements are occured.View full abstractDownload PDF (830K) -
Mankichi HORIGUCHI, Shigeru KOBAYASHI, Tadayuki MORIYA, Kensaku TAKEI, ...Article type: Article
1965 Volume 1965 Issue 78 Pages 39-
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
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Tadashi YOSHIDA, Shichiro ITO, Keiji SUZUKIArticle type: Article
1965 Volume 1965 Issue 78 Pages 40-41
Published: May 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (195K)
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