EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Other / Unknown
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
On climbout above 10;000 feet the FO and I noticed a vibration in the floor that was getting worse then better then worse again. At that time the Flight Attendant called and said 'I feel a vibration in the floor and I can see it moving'. At that time we contacted the Dispatcher and Maintenance and told them the situation and we all agreed to return to [our departure airport]. The threat was we had an aircraft that had a vibration and we did what we thought was the safest thing to do and bring it back to get it looked at.
EMB-145XR Captain reported returning to departure airport after experiencing vibration that was felt in the floor of the aircraft.