Development of the HTS-SQUID system for measuring ULF band magnetic field changes related with earthquakes

N. Kasai*, Y. Fujinawa, H. Iitaka, K. Nomura, Y. Hatsukade, S. Sato, H. Nakano, T. Doi, T. Nemoto, A. Ishiyama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The electromagnetic field change in the ultra low-frequency (ULF) band was observed in order to investigate the precursory phenomena of crystal activity such as earthquakes, volcanic eruptions and landslides. The measurements are conducted to make clear the generation mechanism of the anomalous electromagnetic field occurring before and during these disastrous phenomena. We have constructed a portable system with a HTS-SQUID magnetometer for the observation of the ULF magnetic field. A dewar that kept liquid nitrogen for about three weeks was developed for a long recording period. The performance of the system was tested at Mt Bandai, an active volcano in Fukushima prefecture, Japan. The system worked for 36 hours. Some anomalous magnetic held changes were recorded before and after the volcanic earthquake which occurred during the field test.

Original languageEnglish
Pages (from-to)1135-1139
Number of pages5
JournalSuperconductor Science and Technology
Issue number12
Publication statusPublished - 2001 Dec

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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