Vector HTS-SQUID system for ULF magnetic field monitoring

Y. Machitani, N. Kasai, Y. Fujinawa, H. Iitaka, N. Shirai, Y. Hatsukade, K. Nomura, K. Sugiura, Atsushi Ishiyama, T. Nemoto

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Anomalous magnetic field variations in the ultra low frequency (ULF) band were observed as precursory phenomena of earthquakes. We constructed a portable monitoring system by using HTS-SQUIDs for measuring the ULF environmental vector magnetic field. The operation of the system was verified at Mt. Bandai, an active volcano. The system safely worked over 100 hours on batteries. We have achieved long term monitoring with the system at the National Institute of Advanced Industrial Science and Technology (AIST) from February 7 to March' 22 of 2002 using AC power. The measured magnetic field variations were compared with groundwater level, electric field and geo-electric pulse current variations measured at AIST in order to investigate the source of magnetic field radiation found during the long term monitoring.

    Original languageEnglish
    Pages (from-to)763-766
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume13
    Issue number2 I
    DOIs
    Publication statusPublished - 2003 Jun

    Fingerprint

    extremely low frequencies
    SQUIDs
    Magnetic fields
    Monitoring
    magnetic fields
    electric pulses
    Volcanoes
    ground water
    volcanoes
    Frequency bands
    electric batteries
    Groundwater
    Earthquakes
    alternating current
    earthquakes
    Electric fields
    Radiation
    electric fields
    radiation

    Keywords

    • Earthquake
    • HTS-SQUID
    • Long term monitoring
    • Magnetic field variation
    • Monitoring system
    • Ultra low frequency

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Physics and Astronomy (miscellaneous)

    Cite this

    Machitani, Y., Kasai, N., Fujinawa, Y., Iitaka, H., Shirai, N., Hatsukade, Y., ... Nemoto, T. (2003). Vector HTS-SQUID system for ULF magnetic field monitoring. IEEE Transactions on Applied Superconductivity, 13(2 I), 763-766. https://doi.org/10.1109/TASC.2003.814054

    Vector HTS-SQUID system for ULF magnetic field monitoring. / Machitani, Y.; Kasai, N.; Fujinawa, Y.; Iitaka, H.; Shirai, N.; Hatsukade, Y.; Nomura, K.; Sugiura, K.; Ishiyama, Atsushi; Nemoto, T.

    In: IEEE Transactions on Applied Superconductivity, Vol. 13, No. 2 I, 06.2003, p. 763-766.

    Research output: Contribution to journalArticle

    Machitani, Y, Kasai, N, Fujinawa, Y, Iitaka, H, Shirai, N, Hatsukade, Y, Nomura, K, Sugiura, K, Ishiyama, A & Nemoto, T 2003, 'Vector HTS-SQUID system for ULF magnetic field monitoring', IEEE Transactions on Applied Superconductivity, vol. 13, no. 2 I, pp. 763-766. https://doi.org/10.1109/TASC.2003.814054
    Machitani Y, Kasai N, Fujinawa Y, Iitaka H, Shirai N, Hatsukade Y et al. Vector HTS-SQUID system for ULF magnetic field monitoring. IEEE Transactions on Applied Superconductivity. 2003 Jun;13(2 I):763-766. https://doi.org/10.1109/TASC.2003.814054
    Machitani, Y. ; Kasai, N. ; Fujinawa, Y. ; Iitaka, H. ; Shirai, N. ; Hatsukade, Y. ; Nomura, K. ; Sugiura, K. ; Ishiyama, Atsushi ; Nemoto, T. / Vector HTS-SQUID system for ULF magnetic field monitoring. In: IEEE Transactions on Applied Superconductivity. 2003 ; Vol. 13, No. 2 I. pp. 763-766.
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