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J-array

Research Project

Project/Area Number 06302025
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

ANDO Masataka  Kyoto Univ., DPRI., Prof., 防災研究所, 教授 (80027292)

Co-Investigator(Kenkyū-buntansha) SHIMIZU Hiroshi  Kyushu Univ., Research Associate, 理学部, 助手 (50178985)
SUDA Naoki  Nagoya Univ., Research Associate, 理学部, 助手 (10222069)
FUKAO Yoshio  Tokyo Univ., Prof., 地震研究所, 所長 (10022708)
HASEGAWA Akira  Tohoku Univ., Prof., 理学部, 教授 (40004460)
SATO Tamao  Hiroshaki Univ., Associate Prof., 理学部, 助教授 (40111223)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥8,100,000 (Direct Cost: ¥8,100,000)
Fiscal Year 1995: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1994: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsJ-array / Seismic Observation Network / Seismic Array / Interior of the Earth / A compilation of the waveform data / Earth's core / New-J-array / detail structure of Mantle / アレイ地震観測 / 不連続面 / 実体波の伝播 / 地震予知計画 / 微細構造
Research Abstract

In 1987, the International Union of Geodesy and Geophysics (IUGG) formed a committee for Study of the Earth's Deep Interior (SEDI). Its main aim is in studying the Earth' core and the lower mantle, regarding it as an important part of earth science. Scientists around the world began researches on the Earth's core. This interest in the Earth' core also rose in Japan, and in 1990, project "Earth's Core" received the Grants-Aid for Scientific Research on Priority Areas from the Ministry of Education, Science, Sports and Culture. "J-Array" was part of the project.
"J-Array" can be considered as a giant telescope aimed at the Earth's interior. The sensors for this telescope are short-period seismometers. This project aims to pick up signals of micro-earthquakes from background noise by amplifying it by array observation. The final object is to define the fine structures of the Earth' interior to understand the motions and history of the Earth' interior by catching the seismic waves (P and S … More waves) that were reflected and refracted by various surfaces in the Earth.
Under this grant-in-aid, further recordings and analyzes were continued for increasing the database for large earthquakes and earthquakes occurring in different regions. The "J-Array" project should take into consideration the possible applications of the database and future prospects. A compilation of the seismic waveform data for the major earthquakes was published. This book most certainly plays an important role in further studies and education. A CD-ROM containing the seismic database (SAC format) was also published. It will be a big contribution from Japan to earth science in the world.
Although the "J-Array" is large, it is still small compared to the size of the Earth. Therefore, the portion of the Earth's interior that can be observed by it is also limited. To overcome this problem, it is necessary to cooperate with other countries. Many seismic observation networks exist in the world today such as the network in California with 700 observation points, the North China network with 100 points, the network of Taiwan with 60 points, the Graefenburg Array of Germany, and the Warramunga Array of Australia. By collaborating with these networks, it will be possible to observe thee Earth's interior from all angles. These collaboration will be conducted in the next "New J-array Project". Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] K, Yomogida: "Deep Structure of the Earth" J.Phys.Earth. 44. 655-656 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y, Morita: "The Characteristics of JーArray Seismograms" J.Phys.Earth. 44. 657-668 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A, Yamazaki.K, Hiramatsu and T, Shibutani: "Wave form Station Anomaly-Defintion and Example for J-Array Station" J.Phys.Earth. 44. 675-686 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H, Sugioka.Y, Fukao and S, Sakai: "Anomalously Early First Arrival to the J-Array from Teleseismic Events" J.Phys.Earth. 44. 687-700 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] F, Niu and H, Kawatatsu: "Complex Structure of Mantle.Discontinuties at the Tip of the Subducting Slab beheath Northeast China-A Preliminary Investigation of Broadband Receiver Function" J.Phys.Earth. 44. 701-712 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A, Yamazaki and K, Hirahara: "The Upper-Mantle P-Wave Velocity Structure beneath the Northern Japan Arc,as In ferred from J-Array Data" J.Phys.Earth. 44. 713-728 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Yomogida: "J-Array : Deep Structure of the Earth" J.Phys.Earth.Vol.44. 655-656 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Morita: "The Characteristics of J-Array Seismograms" J.Phys.Earth.Vol.44. 657-668 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Yamazaki, K.Hiramatsu, and T.Shibutani: "Waveform Station Anomaly-Definition and Example for J-Array Stations" J.Phys.Earth.Vol.44. 675-686 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Sugioka, Y.Fukao and S.Sakai: "Anomalously Early First Arrival to the J-Array from Teleseismic Events" J.Phys.Earth.Vol.44. 687-700 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] F.Niu and H.Kawatatsu: "Complex Structure of Mantle Discontinuities at the Tip of the Subducting Slab beneath Northeast China-A Preliminary Investigation of Broadband Receiver Function" J.Phys.Earth.Vol.44. 701-712 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Yamazaki and K.Hirahara: "The Upper-Mantle P-Wave Velocity Structure beneath the Northern Japan Arc, as Inferred from J-Array Data" J.Phys.Earth.Vol.44. 713-328 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 山崎朗.平原和朗: "The kupper mautle P-wave velo city stmcture benath the northern Japan are,as in terred from J-Array data" Journal of physics of the Earth. 43(印刷中). (1997)

    • Related Report
      1995 Annual Research Report
  • [Publications] 山崎朗.平原和朗.渋谷拓郎: "Wave form Stution Auomaly:definition and example for J-Array statious" Journal of Physics of the Earth. 43(印刷中). (1997)

    • Related Report
      1995 Annual Research Report
  • [Publications] 東野陽子,蓬田清: "Complex scattering at the core-mantle boundauy obserued in short-period P-diffracted waves" Journal of physics of the Earth. 43(印刷中). (1997)

    • Related Report
      1995 Annual Research Report
  • [Publications] B.L.N Kenett and R-D.Van der Hilst: "Using a synthefic contineutal array in Australiato study the Earth's interion" Journal of Physics of the Earth. 43(印刷中). (1997)

    • Related Report
      1995 Annual Research Report
  • [Publications] 安藤雅孝: "地球深部を見る地震観測網“Jアレイ"" 科学. 64. 699-700 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Nakamura,M,and Ando,M.: "Anomalous phases observed in Seismograms of deep earthquakes." Bull.Disast.Res.Inst.,Kyoto Univ.44(in press). (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Jアレーグループ: "Jアレー波形集" Jアレー波形集(森田裕一編集). (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 安藤雅孝,平原和朗: "地球中心核日本列島地震大アレー" 月刊地球. 15. 67-74 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] 山崎朗,平原和朗: "日本周辺の沈み込み帯における上部マントル速度構造(1)" 日本地震学会講演予稿集(1994). No.2. 107 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2021-04-07  

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