TOKYO (AP) — Helicopter surveys on Sunday showed more extensive damage than earlier thought from an overnight earthquake in the mountainous area of central Japan that hosted the 1998 Winter Olympics. The agency revised the magnitude from a preliminary 6.8 while the U.S. Geological Survey measured it at 6.2. Since the quake occurred inland, there was no possibility of a tsunami. Ryo Nishino, a restaurant owner in Hakuba, a ski resort village west of Nagano, told Japanese broadcaster NHK that he had never experienced a quake that shook so hard. All 21 people trapped under collapsed houses were rescued, with two of them injured, the National Police Agency told Japan's Kyodo news agency.