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 | |
| 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
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 journal › Article
}
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, Atsushi
AU - Nemoto, T.
PY - 2003/6
Y1 - 2003/6
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
UR - http://www.scopus.com/inward/record.url?scp=0042942797&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0042942797&partnerID=8YFLogxK
U2 - 10.1109/TASC.2003.814054
DO - 10.1109/TASC.2003.814054
M3 - Article
AN - SCOPUS:0042942797
VL - 13
SP - 763
EP - 766
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 2 I
ER -