Japan Geoscience Union Meeting 2015

Presentation information


Symbol S (Solid Earth Sciences) » S-EM Earth's Electromagnetism

[S-EM33] Electromagnetic Induction in the Earth and Planetary Interiors, and Tectono-Electromagnetism

Tue. May 26, 2015 11:00 AM - 12:45 PM 102A (1F)

Convener:*Wataru Kanda(Volcanic Fluid Research Center, Tokyo Institute of Technology), Masahiro Ichiki(Graduate School of Science, Tohoku University), Chair:Maki Hata(Earthquake Research Institute, the University of Tokyo)

12:15 PM - 12:30 PM

[SEM33-12] A Comparison Evaluation of Geomagnetic Observation Signal Using HTS-SQUID Magnetometers at Iwaki Observation Site

*Yuta KATORI1, Kan OKUBO1, Tsunehiro HATO2, Akira TSUKAMOTO2, Keiichi TANABE2, Nobuhito ONISHI3, Chikara FURUKAWA3, Shinji ISOGAMI4, Nobunao TAKEUCHI5 (1.Tokyo Metropolitan University, 2.International Superconductivity Technology Center, 3.Tierra Tecnica, 4.Fukushima National College of Technology, 5.Tohoku University)

Keywords:HTS-SQUID Magnetometer, Geomagnetic Observation, earthquake piezomagnetic effect

This study addresses a comparison evaluation of high-resolution geomagnetic field observation systems using HTS-SQUID (high-temperature-superconductor based super conducting quantum-interference-device) magnetometers.
Our research group reported successful observation of "co-faulting" Earth's magnetic field changes, whose sources are the earthquake piezomagnetic effects, in 2008 Iwate-Miyagi Nairiku earthquake of M7.2 (2011 Okubo et al.). Then, an important finding is that the geomagnetic variation signal accompanying fault movement is very small; therefore development of a high-sensitive magnetometer system is very significant.
To solve this problem, since March 2012 we have introduced long-term precise geomagnetic observations using high-temperature-superconductor based superconducting-quantum-interference-device (HTS-SQUID) magnetometer system Unit No.1 (mark I) at Iwaki observation site (IWK) in Fukushima, Japan. The observation clock has been synchronized by use of GPS signals. An high-resolution accelerometer is also installed at observation point.
Moreover, since October 2014, we have also introduced the new HTS- SQUID magnetometer system Unit No.2 (mark II). In this study, we make a comparison evaluation of the geomagnetic field observation systems, and then we estimate the performance of our HTS-SQUID magnetometer systems for geomagnetic observation.