Offshore 7.7 Magnitude Quake Prompts Japan Tsunami Advisory and Elevated Seismic Warning

An earthquake measuring 7.7 on the Richter scale occurred off the coast of northern Japan, leading to immediate coastal alerts. A tsunami warning was initially issued but later reduced to an advisory, with an 80-centimeter wave observed at Kuji Port. Authorities have also cautioned 182 municipalities about a slightly higher probability of a magnitude 8 or stronger earthquake occurring within the coming week.