Last August, the Japan Meteorological Association (JMA) issued its first mega quake advisory under rules ... Trough was higher than normal, after a 7.1-magnitude jolt that injured 15 people.
The Japan Meteorological Agency urged Kyushu ... from Okinawa to Ibaraki prefectures, after a magnitude-7.1 earthquake struck off Miyazaki Prefecture in the Hyuganada Sea on Aug.