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; A. 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, A. Ishiyama, T. Nemoto

School of Advanced Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

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 1
Event	2002 Applied Superconductivity Conference - Houston, TX, United States Duration: 2002 Aug 4 → 2002 Aug 9

Keywords

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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Vector HTS-SQUID system for ULF magnetic field monitoring",

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.",

keywords = "Earthquake, HTS-SQUID, Long term monitoring, Magnetic field variation, Monitoring system, Ultra low frequency",

author = "Y. Machitani and N. Kasai and Y. Fujinawa and H. Iitaka and N. Shirai and Y. Hatsukade and K. Nomura and K. Sugiura and A. Ishiyama and T. Nemoto",

year = "2003",

month = jun,

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doi = "10.1109/TASC.2003.814054",

language = "English",

volume = "13",

pages = "763--766",

journal = "IEEE Transactions on Applied Superconductivity",

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note = "2002 Applied Superconductivity Conference ; Conference date: 04-08-2002 Through 09-08-2002",

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TY - JOUR

T1 - Vector HTS-SQUID system for ULF magnetic field monitoring

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, A.

AU - Nemoto, T.

PY - 2003/6/1

Y1 - 2003/6/1

N2 - 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.

AB - 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.

KW - Earthquake

KW - HTS-SQUID

KW - Long term monitoring

KW - Magnetic field variation

KW - Monitoring system

KW - Ultra low frequency

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JF - IEEE Transactions on Applied Superconductivity

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