Note : USGS revises magnitude down to 3.8 . NEW : ` ` It was so loud , I thought a plane had gone down , '' he says . NEW : Quake in Illinois was three times as powerful . Epicenter was 100 miles from Chicago and 3 miles underground .
NEW : USGS revises magnitude down to 3.8 . NEW : `` It was so loud , I thought a plane had gone down , '' man says . NEW : Quake in Haiti was 33,000 times as powerful . Epicenter was 50 miles from Chicago and 3 miles underground .