Japan Today. An earthquake with a preliminary magnitude of 5.7 jolted central Japan early Sunday, leaving over 20 people injured in Aichi and Shizuoka prefectures, authorities said. A magnitude 5.7 earthquake strikes central Japan, injuring more than 20 people in Aichi and Shizuoka prefectures. A magnitude 5.7 earthquake struck central Japan on November 8, injuring at least 22 people, damaging buildings and prompting authorities to warn residents about possible further.