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Development of an Ocean Bottom Seismometer to be installed on hard rock by a submarine.

Research Project

Project/Area Number 63460040
Research Category

Grant-in-Aid for General Scientific Research (B)

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

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) IRIKURA Kojiro  Kyoto Univ.DPRI.Prof., 防災研究所, 教授 (10027253)
OIKE Kazuo  Kyoto Univ.Faculty of Science Prof., 理学部, 教授 (40027248)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1989: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsSeismic observation at ocean bottom / digital ocean-bottom seismograph / submarine ship / submarine geophysics / Interior of the Earth / seismic swarm / seismic doservation / ディジタル地震 / 伊東群発 / 海底地震計 / ディジタル海底地震計 / 海底物理 / 地球内部構造研究 / 3成分地震観測 / 堆積層の影響 / ノイズレベル
Research Abstract

A digital ocean-bottom seismograph has been developed, which was designed to be installed on ocean-bottom hard rock by using the submarine research ship "SHINKAI 2000".
The sensor consists of 1 vertical and 2 horizontal components with a natural pendulum period of 1 second. Ground motions are recorded on PROM memory when their amplitudes exceed over a pre-set level. A triggered event is recorded for a period of 250 second and thus the total of 51 events can be stored on the PROM memory of 4 mega bytes with 12 bits of resolution and at a rate of 50 samples per second.
The sensor, amplifier, memories and so on are all put in a 17" glass pressure-vessel. The glass sphere, covered with a hard plastic container, transponder, weight and others are all assembled with a hard leg-frame. All parameters such as starting time of measurement, trigger component (s) , triggering level, and so on are set with commands by an external portable type computer before closing the vessel.
The OBS was set in the Okinawa trough for 5 days in September 1988, and recorded 11 seismic events and back-ground noises during the observations.
After this observation, some modification were made for this OBS.The aluminium, anti-pressure vessel was used instead of the glass vessel. The amount of memory was increased. And software for triggering was improved.
Using a new OBS off the east coast of Ito, Central Japan, where seismic swarm and a submarine eruption occurred in 1989, seismic observation was made before this swarm.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 筒井 智樹, 安藤雅孝, 金嶋 聰: "潜水船「しんかい2000」による海底地震計の設置について" 海洋科学技術センター. 259-266 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 筒井 智樹, 安藤 雅孝, 金嶋 聰, 大濱 壽樹: "ディジタル海底地震計の開発と海底地震観測" 海洋科学技術センター. 293-302 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tomoki Tsutsui, Masataka Ando and Satoshi Kaneshima: "The Ocean-bottom Seismograph installed on Hard Rock by the "SHINKAI 2000"." JAMSTECTR DEEPSEA RESEARCH. Vol4. 259-266 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Tomoki Tsutsui, Masataka Ando, Satoshi Kaneshima and Toshiki Ohtaki: "The development of a digital Ocean bottom seismograph." JAMSTECTR DEEPSEA RESEARCH. Vol5. 293-302 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 筒井智樹,安藤雅孝,金嶋聰: "潜水船「しんかい2000」による海底地震計の設置について" 海洋科学技術センタ-. 259-266 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 筒井智樹,安藤雅孝,金嶋聰,大滝壽樹: "ディジタル海底地震計の開発と海底地震観測" 海洋科学技術センタ-. 293-302 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 安藤雅孝,筒井俊樹,金嶋聰,大滝壽樹: 海洋科学技術センター試験研究報告. 259-266 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 金嶋聰・岩田孝,安藤雅孝: 地震学会平成元年度春秋大会講演予稿集. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 安藤雅孝,筒井智樹,金嶋聰,大滝壽樹: 海洋科学技術センター試験研究報告. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2021-12-07  

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