NEW : Okinawa 's Navy cancels tsunami advisory . NEW : `` There may be slight sea level changes from now on , '' agency says . He told CNN that commanders in Japan and Hawaii were trying to get damage and casualty reports from U.S. military stations on Okinawa , but had heard nothing in the immediate aftermath . Quake centered 53 miles deep , about 6 miles east of Japan .
NEW : Okinawa 's Navy cancels tsunami advisory . NEW : `` There may be slight sea level changes from now on , '' agency says . Quake centered 53 miles deep , about 6 miles east of Japan .