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Volume 47 (2006 - 200･･･
- Issue 6 Pages 323-
- Issue 5 Pages 252-
- Issue 4 Pages 188-
- Issue 3 Pages 120-
- Issue 2 Pages 68-
- Issue 1 Pages 2-
Volume 47, Issue 5
Displaying 1-6 of 6 articles from this issue
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Yukiyasu FUJII, Shinzaburo HORI, Manabu TAKAHASHI, Takato TAKEMURA, We ...2006 Volume 47 Issue 5 Pages 252-258
Published: December 10, 2006
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSFractures parallel to rift, grain and hardway planes of Inada granite were produced by uni-axial tensile test. The surface topography of them were measured by digital stereo-photogrammetry. A pair of photograph was taken by a digital camera with a macro lens and a camera mount system. The accuracy of measurement was about 0.02mm parallel to the fracture surface, and 0.1mm in the vertical direction, for the specimen of 30mm diameter. From the results of calculation of some roughness parameters, the fracture parallel to rift plane is the smoothest, and the fracture parallel to grain plane is smoother than the fracture parallel to hardway plane.
In addition, we discussed how the technique of digital photogrammetry could be applied to many types of geological objects, including surface exposures, fossils, and natural cliffs.View full abstractDownload PDF (4035K) -
Formation and Development of the Slip Surface in Coaly BedHajime TANAKA, Takuya YAMADA, Shigeyuki SUZUKI2006 Volume 47 Issue 5 Pages 259-268
Published: December 10, 2006
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThis paper describes the formation and development of slip surfaces of the landslides that have occurred in the Triassic Nariwa Group. The formation of the slip surfaces is controlled by the characteristics of lithology and pre-existing shear plane. The non-marine facies of the Nariwa Group is characterized by the fining-upwards cycles that start with sandstones at the bottom and end with mudstones and coals at the top. The slip surfaces formed in coaly beds are intercalated between sandstones and mudstones. A difference in rock strength between sandstone and coaly beds might cause the formation of a pre-existing shear plane. The Nariwa Group was folded by the flexural-slip folding. This type of folding creates shear planes parallel to beddings. The shear planes are inferred to be formed in coaly beds. Resulting from slope instability, the shear planes in coaly bed developed into the slip surface that is associated with sheared coaly bed under a landsliding.View full abstractDownload PDF (3156K) -
Akinobu MIYAKOSHI, Takeshi HAYASHI, Atsunao MARUI, Yasuo SAKURA, Shin- ...2006 Volume 47 Issue 5 Pages 269-279
Published: December 10, 2006
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSInformation on three-dimensional distribution of subsurface temperature was examined to evaluate the effect of human activity on groundwater environment in and around Tokyo Lowland facing Tokyo Bay.
Regional variation was observed as follows: high and low areas from the viewpoints of temperature distribution are recognized in the central part to the southern part and from the inland to eastern part, respectively. High temperature area corresponds to an area where lower boundary of groundwater flow is relatively shallow because of shallow upper surface of indurated silt bed which shows high thermal conductivities. This area corresponds also to an area with severe land subsidence resulting from excessive pumping of groundwater. This suggests that the distribution of subsurface temperature is related not only to natural groundwater flow, but also to human activities. In the south of central lowland, existence of a hydrologic structure controlling groundwater flow has been suggested by previous studies. Contrasting difference in subsurface temperatures was observed between the north and south areas in this study, a supporting evidence for the above explanation. On the other hand a comparison between the temperature data in 1956 to 1967 and those of 2001 revealed widespread lowering of the temperature in the inland area. This is explained by downward groundwater flow based on an analysis of temperature-depth profile. The change of groundwater flow regime in the Tokyo Lowland by pumping became clear from subsurface temperature measurements of this study.View full abstractDownload PDF (3025K) -
Eiichi ISHII, Tatsuo FUKUSHIMA2006 Volume 47 Issue 5 Pages 280-291
Published: December 10, 2006
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSIn order to make features of small-scale faults of outcrop scale in Neogene siliceous rocks clear, outcrop observations, boring-core observations and borehole-wall image analyses were carried out, as a preliminary investigation for geological structure model construction which considers structures which exert big influence on flow and mass transfer of underground water. As a result, faults crossing a bedding plane at a high angle and faults parallel to a bedding plane were observed, and their formative process, origin, distribution and permeability were estimated. Faults crossing a bedding plane at a high angle tend to be distributed densely and to form a characteristic structure that is thought to contribute to a major water conducting feature.View full abstractDownload PDF (5667K) -
Takaaki WAJIMA, Kazuharu YOSHIZUKA, Yasuyuki IKEGAMI2006 Volume 47 Issue 5 Pages 292-296
Published: December 10, 2006
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDuring the quarrying, crushed stone waste has been discharged as an industrial waste. In this study, we tried to convert crushed sandstone waste to zeolitic materials using two typical methods for zeolitic conversion from the incinerated ash wastes: alkali hydrothermal method and alkali fusion method. No zeolite phases were synthesized by alkali hydrothermal method, while by alkali fusion method, most of parts in the stone waste can be converted to zeolite phases. The zeolite phases in the product by alkali fusion method were identified zeolite-X and hydroxysodalite, and the cation exchange capacity of the product was ca. 230 cmol/kg, which was higher than that of natural zeolite.View full abstractDownload PDF (914K) -
Hideki INAGAKI, Yasuhito SASAKI2006 Volume 47 Issue 5 Pages 297-309
Published: December 10, 2006
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe conservation of natural environment is one of big themes in applied geology. It is necessary to understand geoecosystem for conservation of natural environments more deeply.
We propose applied geoecology as the field of study to clarify the relationship of ground condition and ecosystem. We have to improve concrete methods for applied geoecology.
Topography investigation, geological survey and animals and plants investigation that are conventional technology are important. In addition, geoecological section method and geoecological map presentation as a new investigation method to grasp the applied geoecological state are more important. We explain the techniques in detail and the example of conservation due to applied geoecology.
Now it is the time to approach applied geoecology following from resource geology, engineering geology, environment geology and disaster geology. The challenge to applied geoecology is an obligation of applied geology.View full abstractDownload PDF (3010K)
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