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tatsuki.washimi - 13:45 Monday 17 February 2020 (12999) Print this report
Infrasound monitor @ Fan hut in this weekend

This is infrasound monitor data at the entrance of KAGRA mine in this weekend.

We can see a structure at 0.1-0.4Hz about from Feb. 16 16:00.

 

One posibility is a dam discharge, but the frequency is different from Miyo-kun's study(~2Hz, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9586)

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tatsuki.washimi - 17:06 Monday 17 February 2020 (13004) Print this report

I compaired the infrasound MIC signal to the KAGRA seismometers.

The increasing of micro-seismic band is coincide.

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shinji.miyoki - 21:15 Monday 17 February 2020 (13006) Print this report

I think it is better to ask Araya-san or takamori-kun GIF members opinions about this phenomena.

Seimic noise oscillates atmosphere like earthquakes. 

tatsuki.washimi - 8:51 Tuesday 18 February 2020 (13009) Print this report

Miyoki-san,

Thank you, I will contact them.

shinji.miyoki - 12:45 Tuesday 18 February 2020 (13010) Print this report

Actually, GPS geodesy using the time delay of GPS  signal due to atmosperic waves that originated from earthquakes is one of method for geophysics.

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