Japan issues megaquake advisory after recent 7.1 quake

Japan issued its first-ever "megaquake advisory" following a magnitude 7.1 quake off Kyushu on August 8, which increased the likelihood of a larger quake in the Nankai Trough. The Japan Meteorological Agency estimates a 70-80% chance of a magnitude 8 or 9 quake within 30 years. The advisory has caused public concern, leading to emergency preparations and cancellations of events across the country.