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

A study on the mantle electrical conductivity structure beneath the eastern edge of continental Asia

Research Project

Project/Area Number 12573004
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

UTADA Hisasi  Earthquake Research Institute, Professor, 地震研究所, 教授 (70134632)

Co-Investigator(Kenkyū-buntansha) YUMOTO Kiyofumi  Graduate School of Sciences, Kyushu University, Professor, 大学院・理学研究院, 教授 (20125686)
SHIMIZU Hisayoshi  Earthquake Research Institute, Research Associate, 地震研究所, 助手 (70302619)
UYESHIMA Makoto  Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (70242154)
GOTO Tadanori  Japan Marine Science and Technology Center, Scientist, 研究員 (90303685)
FUJII Ikuko  Magnetic Observatory, Japan Meteorological Agency, Researcher, 地磁気観測所, 研究官
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥9,700,000 (Direct Cost: ¥9,700,000)
Fiscal Year 2002: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2001: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2000: ¥4,000,000 (Direct Cost: ¥4,000,000)
KeywordsEastern Asia / Long-term observation / Electrical conductivity / Network-MT method / Mantle / Transition zone / NE district of China / Frimolsky region / 雷磁気長期観測 / ネットワークMT / 第四紀火山 / アジア大陸東縁 / 大陸性火山活動 / マントル遷移層 / 地電位差観測
Research Abstract

This three-year research project aimed to make a detailed investigation of the electrical conductivity distribution in the deep mantle beneath region including the NE district of China and the Primorsky region of Russia, where active Quaternary volcanoes widely distribute. For this purpose we carried out long-term observation of natural electromagnetic field variations in the study area in cooperation with Chinese and Russian scientists. Network-MT method developed by the present investigators were employed to reveal the deep structure in the mantle.
In 2001, electric field variation data from the network in Jilin province and magnetic field data at Changchun were analyzed and inverted into one-dimensional (depth only dependent) conductivity model. Resulting conductivity profiles were compared to those of other studies from North America and Hawaii. It was found that no significant difference exists in the conductivity of the upper mantle and the uppermost lower mantle between the present and past results, while the mantle transition zone of the present result showed higher conductivity by nearly one order of magnitude. A preliminary report was published in Geophysical Research Letters (Ichiki et al., 2001).
In 2002, Network-MT experiment was shifted to the south in Liaoning province. Response functions were also obtained by using electric field data from 3 lines and magnetic field data at Changchun up to the period of several, and were individually inverted into one-dimensional conductivity profiles. The results were compared with profiles from Jilin province, and were found to be slightly more resistive in the mantle transition zone. However, it was concluded that additional experiments in wider area are necessary to resolve whether this difference is only apparent or reflects lateral variation of conductivity at depths. This result is going to be published in Geophysical Research Letters.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Ikuko Fujii, Adam Schultz: "The three-dimensional electromagnetic response of the Earth to ring current and auroral oval excitation"Geophysics Journal International. 151. 689-709 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Utada, H., H.Shimizu et al.: "OHP geoelectromagnteic network"Proc. OHP/ION Joint symposium. 4-7 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ichiki, M., Uyeshima, M., Utada et al.: "Upper mantle conductivity structure of the back-arc region beneath northeastern China"Geophys. Res. Let.. 28. 3773-3776 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Zhao, G., J.Tang, H.Utada et al.: "Measurement of Network-MT in two areas of NE China for study of upper mantle conductivity structure of the back-arc region"Seismology and Geology. 23. 143-152 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Palshin N.A., L.L.Vanyan et al.: "Use of the Nakohdka-Naoetsu submarine cable for studying the temporal variability of the integral water transport in the sea of Japan"Oceanology. 41. 447-453 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yumoto, K., the CPMN Group: "積分方程式法を用いた高速三次元電磁応答計算コードの開発"地震研究所技術報告. 7. 6-13 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宗包浩志, 歌田久司: "Characteristics of Pi 2 magnetic pulsations observed at the CPMN stations : A review of the STEP results"Earth Planets Space. 53. 981-992 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 歌田久司, 清水久芳他: "半球電磁気ネットワークによるマントル電気伝導度構造の解明"月刊地球. 23. 3-20 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ikuko Fujii, and Adam Schultz: "The three-dimensional electromagnetic response of the Earth to ring current and auroral oval excitation"Geophys. J. Int.. 151. 689-709 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Utada, H., H. Shimizu, M. Ichiki, T. Koyama, N. Seama, H. Toh, and Y. Hamano: "OHP geoelectromagnteic network"Proc. OHP/ION Joint symposium. 4-7 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ichiki, M., Uyeshima, M., Utada, H., Zhao, G., and Tang, J., and Ma, M.: "Upper mantle conductivity structure of the back-arc region beneath northeastern China"Geophys. Res. Lett.. 28. 3773-3776 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Zhao, G., J. Tang, H. Utada, M. Uyeshima, M. Ichiki, M. Ma, Z. Huang, and H. Wang: "Measurement of Network-MT in two areas of NE China for study of upper mantle conductivity structure of the back-arc region"Seismology and Geology. 23. 143-152 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Palshin N.A., L.L. Vanyan, R.D. Medzhitov, G.I. Shapiro, M.A. Evdoshenko, H. Utada, H. Shimizu, and Y. Tanaka: "2001, Use of the Nakohdka-Naoetsu submarine cable for studying the temporal variability of the integral water transport in the sea of Japan"Oceanology. 41. 447-453 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yumoto, K,. And the CPMN Group (2001): "Characteristics of Pi 2 magnetic pulsations observed at the CPMN stations: A review of the STEP results"Earth Planets Space. 53. 981-992 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Munekane, H., and H. Utada: "Development of an effective computer code to solve the geomagnetic induction problem in three-dimensions using integral equation technique"Technical Report, Earthq. Res. Inst., Univ. Tokyo, in Japanese with English abstract. 7. 6-13 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Utada, H., H. Shimizu, M. Ichiki, T. Koyama, G-Z Zhao, A.D. Chave: "Investigation of the mantle conductivity by the Ocean Hemisphere Network Observation"Earth Monthly, in Japanese. 23. 3-10 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ikuko Fujii, Adam Schultz: "The three-dimensional electromagnetic response of the Earth to ring current and auroral oval excitation"Geophys.J.Inter.. 151. 689-709 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ichiki, M., Uyeshima, M., Utada, H., Zhao, 他: "Upper mantle conductivity structure of the back-arc region beneath northeastern China"Geophys.Res.Lett.. 28. 3773-3776 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Joseph,E.J.,H.Toh,H.Fujimoto,H.Utada et al.: "Seafloor elecromagnetic induction studies in the Bay of Bengal"Marine Geophys.Res.. 21. 1-21 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ichiki,M.,M.Uyeshima,H.Utada,G-Z Zhao et al.: "Preliminary report on the electrical conductivity structure beneath the northeastern part of China"Geophys.Res.Lett.. (in press).

    • Related Report
      2000 Annual Research Report

URL: 

Published: 2000-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi