With several test, we succeeded to take the data and showed the spectrum as shown in Fig.1. (ground motion at the 2nd floor of the Hokubu-kaikan)
So, we can take the ground motion using this portable system in future. (But we need the GPS signal, we cannot take data inside the mine)
If you have interested in the ground motion (ex. atotsu entrance, new laser room, experimental room in your laboratory) please contact to me.
Next step, now we used the AC power supply and DC power supply(pm 15V), but we may possible to change to the battery (12V) operation.
We will make the connector to take the three axis seismometer + microphone (or accelerometer)
