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Sanga, Tomoji*
JNC TJ5400 2004-005, 130 Pages, 2005/03
JNC-TJ5400-2004-005.pdf:18.55MB
The Teshio Plain is considered as a subsidence area during the Quaternary period. This work is estimation of the amounts of crustal deformation in the plain by using Differential Interferometric SAR (Synthetic Aperture Radar) data and is assessing the capability of the technique for estimation of crustal deformation by using SAR data.
Sanga, Tomoji*
JNC TJ5410 2005-006, 159 Pages, 2005/02
JNC-TJ5410-2005-006.pdf:32.48MB
Crustal deformation until the present in the Northern Hokkaido including Horonobe Town, concomitant changes of geological environments and arising earthquake have been nvestigated as the Horonobe underground research laboratory project. As a part of this project, two surveys were performed to elucidate fracture systems in an area including the Horonobe Town:(1)}Interpretation of lineament, Filed survey for fault and fracture(2)}Investigation for eruption history by the RIPL method (This survey is intended for the terrace deposit distributing around the Omagari Fault.)The lineaments, which was recognized by the interpretation and automatically extracted, have common characteristics on the point of direction and density. In the Koetoi and Wakkanai Formation, the peculiar characteristic of fracture is similar. But, the density of lineament in the latter was almost twice as much as that in the former. In the drill hole near the Omagari Fault, there is a group of fractures crossing the bedding plane. By the comparison with the data of this group, lineaments show similar characteristics on the point of direction, density and dip. So, it is considered that the lineaments reflect this group of actures. When the changes on the peculiar characteristic of lineaments and fractures in drill hole are examined, the density of fractures in the hanging side is higher than that in the footwall. In the west side of the fault, the direction of lineament greatly changes on the border almost 400m away from the fault. So, it is estimated that the range of fluence of the fault is up to this border.The investigation of eruption history was performed at the seven points. As a result of this investigation, it became clear that MIS5c and MIS5e in the Atras of Quaternary Marine Terraces (2001) correspond MIS7 and MIS9 respectively and the velocity of uplift decreases to 1/3 compared with that onsidered so far.
Sanga, Tomoji*
JNC TJ7420 2005-096, 262 Pages, 2004/03
JNC-TJ7420-2005-096.pdf:83.18MB
The simulation programs were executed between 120,000 yaers at the Hashikami and Tono region.
Sanga, Tomoji*
JNC TJ7420 2005-091, 159 Pages, 2004/03
JNC-TJ7420-2005-091.pdf:38.76MB
In this study, we developed a method to detect lineaments automatically through statistic features calculated from DEM with reference to topographical features observed around lineaments extracted by photo interpretation.
Sanga, Tomoji*
JNC TJ7420 2005-053, 176 Pages, 2004/03
Various parameters are examined as liniaments detected by this method coincide with ones extracted by photo interpretation.
Sanga, Tomoji*
JNC TJ5420 2004-001, 160 Pages, 2004/03
JNC-TJ5420-2004-001.pdf:43.1MB
Crustal deformation until the present in the Northern Hokkaido including Horonobe Town, concomitant change of geological environments and arising earthquake have been investigated as the Horonobe underground research laboratory project. This lineament study was performed to elucidate fracture systems in an area including Horonobe Town as a part of these projects.
Sanga, Tomoji*
JNC TJ7420 2005-084, 321 Pages, 2003/03
JNC-TJ7420-2005-084.pdf:80.69MB
The simulation programs were executed between 120,000 years at Hashikami region, catchments area of the Hiyoshi river and the Toki river.
Sugawara, Masaaki*; Maruyama, Toru*; Kambara, Hiroshi*
JNC TJ7420 2005-047, 79 Pages, 2003/03
JNC-TJ7420-2005-047.pdf:12.71MB
Configuration and structure of the ore veins of the Toyoha mine, which occur in faults, were studied with the purpose of developing methods for investigating the effect of fault movement to groundwater flow. Information on the shape of the veins were acquired and analyzed. Plane vein maps in some levels and cross sections of four representative vein systems (Tajima-Harima, Izumo-Shinano, Soya, Sorachi) of the Toyoha ore deposit were scanned, and three-dimensional features of vein distributions were recorded as image data. Morphological characteristics of typical veins of the Toyoha ore deposit were extracted from vein maps, geological and mineralogical cross sections and vein sketches. A tendency of vein-shape changes is recognized from the upper to the lower parts; cymoid curve with strong lensing, gentle cymoid curve with relatively constant width, linear vein with relatively constant width in ascending order of depth. This is thought to be a morphological characteristics of shear fracture formed in correspondence with increase of confining pressure. Distribution of vein trace length of the Toyoha mine exist within the range of uncertainty in the figure between fracture trace length and cumulative number of fractures indicated by Ohtsu (2001). Thus, accumulated number of fracture trace length is thought to be in linear relation irrespective of size, region and rock ype.
Ishibashi, Toshihisa*
JNC TJ7420 2005-131, 268 Pages, 2003/02
JNC-TJ7420-2005-131.PDF:60.04MB
no abstracts in English
Sanga, Tomoji*
JNC TJ7420 2005-082, 271 Pages, 2002/03
JNC-TJ7420-2005-082.pdf:54.18MB
Erosion and transportation of the substance which forms geographical feature are expressed with a diffusion equation as the thoretical foundation of a simulation.
Sanga, Tomoji*
JNC TJ7420 2005-081, 80 Pages, 2002/03
JNC-TJ7420-2005-081.pdf:19.9MB
We discuss characteristics of geographical features and a basin besides rivers at Tono using DEM.
*; *; *
JNC TJ7420 2002-001, 96 Pages, 2002/03
JNC-TJ7420-2002-001.pdf:7.07MB
no abstracts in English
*; *; *; *; *; *
JNC TJ7440 2002-009, 1156 Pages, 2001/11
JNC-TJ7440-2002-009.pdf:49.61MB
no abstracts in English
*; *; *; *; *; *
JNC TJ7440 2002-008, 696 Pages, 2001/08
JNC-TJ7440-2002-008.pdf:31.64MB
no abstracts in English
Kambara, Hiroshi*; Ichinose, Tsutomu*
JNC TJ7420 2005-045, 135 Pages, 2001/03
JNC-TJ7420-2005-045.pdf:25.79MB
To collect information on the relation of three-dimensional distribution of past pathways of groundwater around the fault shear zone, crack, and ground stresses, a document investigation and a local investigation were executed for the Toyoha deposit, Hokkaido as a representative of hydrothermal polymetallic ore veins. In addition, we have supplemented with the basic data concerning the geology and the ore deposit collected by the document investigation (sketch of hanging wall in drifts and drilling core, and geological features deposit maps, etc.), the investigation result was summarized in aspect of the geological and hydrodynamic characteristic of the surrounding bedrock, and the distribution of the fissure of the Toyoha deposit. Mineralization would concentrate on a special part in the fault system and vein structure indicates the history of intermitted precipitation. Therefore, hydrothermal vein system is recognized as a fossil of past pathways of water in deep, the vein systems should be natural analogue of hot water circulation. Current K-Ar dating of Toyoha deposit suggests that the hydrothermal activity with mineralization was continuing over 2 million years. Vein structure of Toyoha shows ore minerals repeatedly precipitate during the time of fissure formation. That is, the pulse is a product of an intermittent nature such as like fissure opening, filling, and destruction etc, under the regional complex stress field.