Geoinformatics
Online ISSN : 1347-541X
Print ISSN : 0388-502X
ISSN-L : 0388-502X
Volume 15, Issue 4
Displaying 1-3 of 3 articles from this issue
Development of System and Software
  • Tetsuya SHOJI
    Article type: Development of System and Software
    2004 Volume 15 Issue 4 Pages 185-192
    Published: 2004
    Released on J-STAGE: February 28, 2006
    JOURNAL FREE ACCESS
    A program working on MS-Excel/VBA (Visual Basic for Application) by which X-ray diffraction pattern are displayed on a Excel graph sheet has been developed in order to use powder X-ray diffraction data for many purposes as well as mineral identification. The program supports the following tasks: 1) to transfer X-ray diffraction data from a X-ray diffraction facility to an Excel worksheet (depending each facility), 2) to display diffraction patterns, 3) to search diffraction peaks, and 4) to represent identified minerals. It is expected by the program not only that X-ray diffraction patterns attached on reports or papers are easily prepared by the program, but also that X-ray diffraction results are easily used for other works through MS-Excel.
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Article
  • Go YONEZAWA, Shinji MASUMOTO, Tatsuya NEMOTO, Masanori SAKAMOTO, Kiyoj ...
    Article type: Article
    2004 Volume 15 Issue 4 Pages 193-208
    Published: 2004
    Released on J-STAGE: February 28, 2006
    JOURNAL FREE ACCESS
    The geologic function that assigns a unique geologic unit to every point in the objective 3-D space is a key element of a computer geo-mapping. Algorithms for construction and visualization of 3-D geologic model based on the geologic function have been widely developed. As the concept of geologic boundary is not contained in the geologic function, it was newly defined a generalized geologic function that assigns a pair of directly above and below geologic units to every point in the objective 3-D space. The generalized geologic function clarifies a boundary of geologic units to be visualized. Visual Basic program Geomodel2003 was developed to visualize geologic boundaries on the objective surface by embedding sub-routines for visualization of geologic boundary which had been developed in the Geomodel2000. We verified the adequacy and usefulness of the proposed algorithm. Application of Geomodel2003 to a test data in Honjyo area, Akita Prefecture, Japan, proved that the proposed algorithm is valid 3-D geologic modeling.
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  • M. Farhad HOWLADAR, Daigoro HAYASHI
    Article type: Article
    2004 Volume 15 Issue 4 Pages 207-219
    Published: 2004
    Released on J-STAGE: February 28, 2006
    JOURNAL FREE ACCESS
    The Himalayan mountain system developed from the powerful earth movements which occurred as the Indian plate pressed against the Eurasian continental plate. A series of elastic finite element models are presented to examine the development of major thrusts (MCT, MBT and MFT) in the central Himalaya. Balanced geologic profiles of the central Himalaya which are modified from Johnson's profiles (2002) are used for the purpose under plane strain condition. The convergent rate of India has changed 10 cm/a at 40 Ma, 5 cm/a at 20 Ma and 2 cm/a at 10 Ma. Results show that the horizontal compressive stress σ1 leads to the development of thrust faults in the Ththys Himalaya, Higher Himalaya, Lesser Himalaya, Sub-Himalaya and incipient zones of MCT, MBT and MFT. Especially, the thrust faults are highly concentrated within the whole area of the incipient zones, which influenced the formation of MCT, MBT and MFT at their early stage.
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