11:00 AM - 1:00 PM
[U09-P21] Tonga's volcano eruption signals measured by the evironmental monitoring systems of KAGRA Observatory
Keywords:Underground facility, Sesimic motion, Infrasound, Electromagnetic wave, Tonga's volcano eruption , KAGRA
KAGRA, the Large-scale Cryogenic Gravitational wave Telescope, is a laser interferometer-type gravitational wave detector constructed in Kamioka, Hida City, Gifu Prefecture, Japan. Gravitational waves are propagating phenomena of space-time distortion described by Einstein's general theory of relativity and typically the signal is about 10-18 m on the Earth for a binary black hole merger event. Because the gravitational wave signal is so tiny, it is necessary to reduce all kinds of noise in order to observe it. In order to monitor and distinguish gravitational wave signals from environmental noise such as ground vibrations, sound waves, and electromagnetic waves, a wide variety of environmental sensors are working in KAGRA such as seismometers, strain maters, barometers, infrasound sensors, magnetometers, and so on. One of the unique points of KAGRA is that it is constructed in an underground facility to reduce noise, whereas other gravitational wave detectors, such as LIGO in the U.S. and Virgo in Italy, are constructed on the ground surface.
On January 15, 2022, at 04:14:45 (UTC), the undersea volcano of Hunga Tonga-Funga Ha’apai erupted and caused global seismic, atmospheric, and electromagnetic waves. They were transmitted to Kamioka, more than 8000 km away, and were observed by environmental sensors not only on the ground but also inside KAGRA's underground facility. In this talk, these signals measured by KAGRA's environmental monitors and the transfer functions from the air-pressure wave in the atmosphere to the underground environmental disturbances (e.g., air-pressure, seismic motion) will be reported.
Since such a facility that can simultaneously observe various types of signals is rare in the world, it is expected to be useful not only in astrophysics but also in geophysics, meteorology, and disaster prevention. We hope that this conference will be a good opportunity to share the information with experts in various fields and to connect to future research.
On January 15, 2022, at 04:14:45 (UTC), the undersea volcano of Hunga Tonga-Funga Ha’apai erupted and caused global seismic, atmospheric, and electromagnetic waves. They were transmitted to Kamioka, more than 8000 km away, and were observed by environmental sensors not only on the ground but also inside KAGRA's underground facility. In this talk, these signals measured by KAGRA's environmental monitors and the transfer functions from the air-pressure wave in the atmosphere to the underground environmental disturbances (e.g., air-pressure, seismic motion) will be reported.
Since such a facility that can simultaneously observe various types of signals is rare in the world, it is expected to be useful not only in astrophysics but also in geophysics, meteorology, and disaster prevention. We hope that this conference will be a good opportunity to share the information with experts in various fields and to connect to future research.