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

doi:10.1109/TASC.2003.814054

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 journal › Article

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 language	English
Pages (from-to)	763-766
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	2 I
DOIs	https://doi.org/10.1109/TASC.2003.814054
Publication status	Published - 2003 Jun

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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., Nomura, K., Sugiura, K., Ishiyama, A., & 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

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AU - Machitani, Y.

AU - Kasai, N.

AU - Fujinawa, Y.

AU - Iitaka, H.

AU - Shirai, N.

AU - Hatsukade, Y.

AU - Nomura, K.

AU - Sugiura, K.

AU - Ishiyama, Atsushi

AU - Nemoto, T.

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Access to Document

10.1109/TASC.2003.814054