The earth shook a magnitude 2.5 quake, 3.2 miles out of Boone, about 2 1/2 miles northeast of Blowing Rock and originating some 6 miles underground, their timing putting the quake at 1:28pm. My watch said 1:29 when my house shook. Reports from all around the center of Boone said that the sound was like that of an explosion, but the earth moving was definitely a rolling of wave motion through the rocks, the very definition of an earthquake.