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STRONG MOTION PREDICTION AND DESTRUCTIVITY EVALUATION FOR AN INHOMOGENEOUS SEDIMENTARY BASIN BASED ON THE UNDERGROUND STRUCTURE AS ESTIMATED FROM MICROTERMOR OVSERVATIONS

Research Project

Project/Area Number 13680548
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster science
Research InstitutionTokyo University of Science

Principal Investigator

SHINOZAKI Yuzo  Tokyo University of Science Department of Architecture, Professor, 工学部, 教授 (80026236)

Co-Investigator(Kenkyū-buntansha) CHO Ikuo  Geo-Research Institute Researcher, 研究員 (10328560)
TADA Taku  Tokyo University of Science Department of Architecture, Research Associate, 工学部, 助手 (40349840)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsMicrotremor / Phase velocity / Spatial autocorrelation method, / Enlarged Henstridge method / Exploration method / Vo / Velocity structure
Research Abstract

We investigated the practical applicability, to large arrays of seismometers with radii up to 600 meters, of the tentatively named Enlarged Henstridge method, a recently proposed method of microtremor exploration to obtain, in a fairly simple way, the S-wave velocity structure which in one of the most important parameters to represent the underground structure. The Enlarged Henstridge method, which allows one to obtain the dispersion curve of the phase velocity of surface waves by measuring microtremors with an array of seismometers placed at least 3 locations along a circumference, is characterized by the lack of necessity to place a seismometer at the center of the circle and by the tolerance for uneven spacing of seismometers along the circumference. The applicability of the method had been demonstrated for arrays with radii of 5 and 15 meters, but it had never once been applied to larger arrays. In order to investigate the practical applicability of the Enlarged Henstridge Method t … More o large arrays consisting of 3 stations, we conducted an exploration of microtremors, at a location where the underground structure is known, by deploying circular arrays of 3 seismometers spaced at even or uneven intervals along circumferences 25 to 600 meters in radius.
We first measured microtremors with an array of 4 stations, or 3 stations spaced at nearly equal intervals along a circumference plus a fourth station at the center of the circle, and estimated the dispersion curve a beneath the observation site by applying the SPAC method to the data obtained. We then estimated the dispersion curve with the Enlarged Henstridge method by using arrays of 3 evenly or unevenly spaced stations, and examined the adequacy of the analysis results by comparing them with the dispersion curve as estimated with the SPAC method. We found that the Enlarged Henstridge method was comparable to the SPAC method in terms of the accuracy of the analysis results, and that the wavelength range, over which the dispersion curve could be evaluated adequately, tended to shift toward longer wavelengths as compared with the case of the SPAC method.
Uneven spacing of seismometers has influences, by way of observation errors and other factors, on the estimation accuracy for the dispersion curve. We empirically investigated the tolerable extent of unevenness in the configurations of the stations for which appropriate dispersion curves could be obtained with a high likelihood, as well as the wavelength ranges over which those appropriate dispersion curves were obtained in that case. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 長 郁夫, 志賀卓弥, 篠崎祐三: "短周期微動への空間自己相関法の適用における交通量の影響"日本建築学会技術報告集. 14号. 93-96 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 長 郁夫, 志賀卓弥, 篠崎祐三: "交通量の多い道路近くにおける短周期微動の場と分散曲線の解析"日本建築学会構造系論文集. 552号. 59-68 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 長 郁夫, 篠崎祐三: "空間自己相関法に於けるセンサー数の物理的な意味から推論される短波長側の解析限界"第11回日本地震工学シンポジウム論文集. 339-344 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 長 郁夫, 篠崎祐三: "微動を用いた構造決定のための円形アレイデータ解析に関する理論的研究"物理探査. 56. 29-42 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I. Cho, T. Shiga & Y. Shinozaki: "Application of the space autocorrelation method to the short-period microtremors: In-fluences of heavy traffic"AIJ J. Technol. Des.. 14. 93-96 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I. Cho, T. Shiga & Y. Shinozaki: "Effects of heavy traffic on dispersion curves analyzed by using arrary data sets of short-period microtremors - Data processing of circular arrays by means of a method of Henstridge"J. Struct. Constr. Eng., AIJ. 552. 59-68 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I. Cho & Y. Shinozaki: "Shorter limits of the wavelength ranges for the space autocorrelation method deduced from a physical interpretation of the number of sensors on a circle"Proc. 11th Japan Earthq. Eng. Symp., CD-ROM. 67. 339-344 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I. Cho & Y. Shinozaki: "A theoretical study on circular array analyses for an exploration method using microtremors"BUTSURI-TANSA. 57, No.1. 29-42 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 長郁夫, 篠崎祐三: "空間自己相関法におけるセンサー数の物理的な意味から推論される短波長側の解析限界"第11回日本地震工学シンポジウム論文集. 339-344 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 長郁夫, 篠崎祐三: "微動を用いた構造決定のための円形アレイデータ解析に関する理論的研究"物理探査. 56巻1号. 39-52 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 長郁夫, 志賀卓弥, 篠崎祐三: "短周期微動への空間自己相関法の適用における交通量の影響"日本建築学会技術報告集. 第14号. 93-96 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 長郁夫, 志賀卓弥, 篠崎祐三: "交通量の多い道路近くにおける短周期微動の場と分散曲線の解析"日本建築学会構造系論文集. No.552. 59-68 (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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