I had the same experience twice over the last 24 hours in the Maryville, TN area (9/20/11). One was at 0530 in the morning and woke my husband and I from sleep - a loud boom and then the house trembling. After, there were several smaller booms with less trembling. At 19:45 this evening, I experienced the same scenario - one large boom with shaking, then several smaller ones. We live near an airport that military planes use, but I have never experienced this before. We also live right on a lake (fresh water) - no salt water near, however.
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