We like to see it if you think this is interesting.
... Just a naive guess: Is it just because the seismic level got quiet in the night?
You looks consistently confused some words like damping, Q, and peak height.
dy = H dx
As the damping makes the Q lower, the peak height also gets lowered by the damping.
But if the disturbance gets smaller, the peak height can become small even without any change of the damping and the Q.
By the way I found a trend, which can be seen in all of the data taken today and yesterday.
The resonances of pitch and yaw around 0.5Hz look like being damped, because their height from the floor become lower than the past.
I don't know what goes on, but it is interesting because you can see the trend in all of the data.