At approximately 2am on sunday, december 16th 2012, i was sitting down watching t.v. when i heard and felt a highly percussive, what can only be described as, horn blast, it had such resonance that i could feel my chest vibrating. It continued to sound in short blasts of first one, and then three "trumpets." Each 'blast' lasted from 3-6 seconds and could be physicaly felt as well as heard, it also caused both of my cats to run and hide under my bed for the next half hour or so. It was kind of scary, i didnt see anything, i just stood there, transfixed by this unearthly booming. After about 3 minutes of these intermitent blasts it simply stopped.