I was recording my daughter's band performance, with a Vivitar HF-TR59 59" Tripod set on wooden bleachers, Sony a7iii with 24-240 lens, OIS on. Camera shake warning was on most of the time, and one could see the some camera movement on the recording. A possible cause was other parents settling themselves on the benches: the wooden planks of the bleaches transferred their movements from tens of feet away.
Thus the question: how do I avoid that? Are there tripods available with vibration dampening? Or perhaps one can place something on the floor underneath the tripod? I have doubts about placing a soft mat underneath the tripod because, even though that may dampen floor vibration, that may also destabilize the tripod.