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 . Evans instantly found others in her area who had experienced the shaking , and says she found them comforting because `` I 'd never felt an earthquake before . '' New :
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 . New :