• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1998 Fiscal Year Final Research Report Summary

Deveropment of high resolution tomography method based on coherent seismic wave

Research Project

Project/Area Number 09555142
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 構造工学・地震工学
Research InstitutionThe University of Tokyo

Principal Investigator

HIGASHIHARA Hiromichi  The University of Tokyo, EARTHQUAKE RESEARCH INSTITUTE,professor, 地震研究所, 教授 (10125891)

Co-Investigator(Kenkyū-buntansha) ARAYA Akito  The University of Tokyo, EARTHQUAKE RESEARCH INSTITUTE,research associate, 地震研究所, 助手 (30272503)
OHTAKE Yuji  The University of Tokyo, EARTHQUAKE RESEARCH INSTITUTE,research associate, 地震研究所, 助手 (60282729)
HORI Muneo  The University of Tokyo, EARTHQUAKE RESEARCH INSTITUTE,associate professor, 地震研究所, 助教授 (00219205)
Project Period (FY) 1997 – 1998
Keywordsphysical prospecting / controlled sources / earthquake prediction / elastic wave tomography / seismic motion
Research Abstract

We have developed an active underground tomography system based on a new-brand idea. In 1997 fiscal year, we set up testing system and prepared the manufacturing of a seismic source which was the center of the present research. In 1998 fiscal year, we manufactured the source and installed it in the testing system. We have been running it and made improvements.
(1) We established a prototype model of the accurately controlled artificial seismic source. In this source, an electric servomotor drives an eccentric mass. The frequency of the rotation is maintained extremely constant. As a result, the source could emit very pure sinusoidal wave.
(2) We established a prototype model of a sensor unit, as a combination of high sensitivity feedback seismographs, amplifiers, AD converters and a PC.This PC manages the timing of AD conversion and condenses the data by stacking.
(3) We also developed mathematical theory which affords the basis for the analysis of data. We made and tested several numerical analysis methods of elastic wave field including a semi analytic method of multi-layer medium a finite difference scheme. We have calculated many forward problems.
(4) We attempted to build a new inversion algorithm that estimated the under ground structure. It was revealed, however, necessary to prepare a concise model of scattering of the elastic wave by inelastic region. We established a plan of new experimental study of this phenomenon.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Ha Dong-Ho.,Higashihara H: "Wave field generated by laterally vibrating source attached to the surface of elastic half space" 土木学会論文集. No.584/1-42. 1-10 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Megawati K.,Higashihara H: "Crustal structure under the Akashi Kaikyo Bridge as revealed from explosion seismic experiments" 土木学会論文集. No.584/1-42. 11-18 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 東原紘道: "ACROSS the tide of recession" 月刊地球. 号外20巻. 204-208 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori and H.Morihiro: "Micromechanical analysis on deterioration due to freezing and thawing in porous brittle materials" International Journal of Engineering Sciences. Vol.36.No.4. 511-522 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori and J.Kubo: "Analysis of probabilistic distribution and range of average stress in each phase of heterogeneous materials" J.Mech.Phys.Solids. Vol.46.No.3. 537-556 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Higashihara H.:Shiogama Y.: "Development of a new,high precision harmonic seismic wave tomography method" Proc.4th International Conference of the European Association for Structural Dynamics. (in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ha Dong-Ho., and Higashihara H.: "Wave field generated by laterally vibrating source attached to the surface of elastic half space" Proceeding of Japan Society of Civil Engineers. 584. I-42,1-10 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Megawati K., and Higashihara H.: "Crustal structure under the Akashi Kaikyo Bridge as revealed from explosion seismic experiments" Proceeding of Japan Society of Civil Engineers. 584. I-42,1-10 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Higashihara H.: "ACROSS the tide of recession (in Japanese)" Gekkan Chikyu.special issue. Vol.20. 204-208 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Gurler, E.D.and Higashihara H.: "3-D numerical simulation of long duration seismic pulses recorded in the near field during Kobe earthquake." Proc.8th international conference on soil dynamics and earthquake engineering.Istanbul.Turkey.1997.6,8-9. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Megawati, K.and Higashihara, H.: "Seismic performance of tuned mass dampers attached to towers of a suspension bridge." Proc.2nd world conference on structural control.Kyoto.Japan.1998.6.28-7.1. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Oguni, M.Hori amd K.Ikeda: "Analysis on evolution pattern of periodically distributed defects" International Journal of Solids and Structures. Vol.34, No.25. 3259-3772 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori and H.Morihiro: "Micromechanical analysis on deterioration due to freezing in porous brittle materials" International Journal of Engineering Sciences. Vol.36, No.4. 511-522 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori and J.Kubo: "Analysis of probabilistic distribution and range of average stress in each phase of heterogeneous materials." J.Mech.Phys.Solids. Vol.46, No.3. 537-556 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori and T.Kameda: "Formulation of inverse problem of identifying material properties based on equivalent inclusion method" Proceeding of International Symposium on Inverse Problems. 225-234 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori and N.Vaikunthan: "Analysis of smooth crack growth in brittle materials" Mechanics of Materials. Vol.28. 33-52 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori and S.Nemat-Nasser: "Universal bounds for effective piezoelectric moduli." Mechanics of Materials. Vol.30. 1-19 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori and N.Vaikunthan: "Analysis of the initiation of periodically distributed defects." International of Plasticity. Vol.14, No.8. 673-688 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1999-12-08  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi