超電導センシング技術研究組合(Superconducting Sensing Technology Research Association; SUSTERA)

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#Development of geomagnetism observation system for detection of earthquake

In the current earthquake early warning system in Japan, a fast longitudinal seismic wave (p-wave) is detected by multiple seismograph, and the position of seismic center and the seismic intensity of next coming transverse wave (s-wave) are calculated for warning. We developed a geomagnetism observation system with three-component HTS-SQUID sensors to sensitively detect a small change in the Earth’s magnetic field due to a fault rupture causing an earthquake. Since the change in the magnetic field propagates at a speed of light, it is expected to detect occurrence of earthquake several to several tens of seconds earlier before seismic p-wave reaches. Two systems have been working in Fukushima prefecture and real-time data are obtained via wireless communication and internet.

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Image of earthquake detection utilizing geomagnetism observation system.

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Composition of SQUID observation system installed in Fukushima prefecture.

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An example of earthquake observation (September 20, 2013, M5.3).