Seismic noise level during the run

the data was obtained at about 8:00pm each day. The nunmber of mean is 50.
variation of spectrum

the data was obtained at about 10:00 each day. The number of mean is 20.

the data was obtained at about 14:00 each day.

the data was obtained at about 18:00 each day.

the data was obtained at about 22:00 each day.

the data was obtained at about 2:00 each day.

the data was obtained at about 6:00 each day.