Last night I installed the INF01 infrasound sensor, it has been operated in the NAOJ room for about 1 year, to the outdoor PEM monitoring bench at Mozumi.

The temperature is not so high.
Since the LAN cables are not prepared for this hut yet, they (infrasound sensors and DAQ PCs) are connected to each other locally.
I'll operate them for some days temporarily.

I compared the signals between the INF04s located in the NAOJ room and located outside of the Analysis building.

In the infrasound signal, there are large glitches due to human activities in the "in room" data, but not in the "outdoor" data.
The actual acoustic signal, our target,  is larger in the "outdoor" data.
(around 3:00 UTC -> dam draining?  c.f. [SEIS signal])

In the barometer signal, the glitch level is almost the same.

Device temperature was changed a lot in the "outdoor" data. However, its effect doesn't affect the barometer data.

Because Jul.18 was a national holiday and less human activities, it was not a good example to compare the outside and in room.

I also checked the data of Jul.19.

The units in the vertical axes are wrong.
Correct ones are

• Infrasound : Pa -> mPa
• Pressure : hPa -> kPa