December 6 2012 – Mystery booms in Columbia County, Georgia, USA – Mystery rumblings in the USA
Steven Uhles from News Times reported on the 6th of December 2012 mystery booms heard and felt by multiple residents of Columbia County, Georgia, USA. The strange noises were neither trigerred by earthquakes nor by an army exercise. The responsible already received reports about strange boom sounds in other parts of the county on the 4th and the 5th of December 2012 but it is not known if they are related. The last earthquake in the Columbia County occured on April 23, 2012 (2.3 earthquake). Tremors and Earthquake sounds can only be heard from 2.0 and above on the Richter scale.
As shown on the map, mystery rumblings have been heard all over the US within the last 5 days. To read more about these rumblings, I suggest you to read a nice article from Global Rumblings.
All the best and thank you for your confidence!