Earthquake northern Japan ignites tsunami alert and megaquake warning

Earthquake northern Japan struck early Monday with a magnitude ↓ 7.7, prompting a fleeting tsunami alert along the Tohoku coast. Authorities quickly lifted the warning after tide gauges showed no significant sea‑level rise.

Earthquake northern Japan triggers brief tsunami alert

The Japan Meteorological Agency issued an advisory indicating a slightly elevated risk of a larger seismic event, often termed a “megaquake.” Experts from the University of Tokyo cautioned that the region’s complex fault network could still unleash stronger tremors.

“Residents should remain vigilant and follow official guidance,” said a local disaster officer.

Seismic monitoring stations, many powered by nuclear-derived research, are analyzing aftershocks in real time. For broader context, see the latest coverage from Reuters and Bloomberg.

Words by: Eleanor Cross

Chief Washington Correspondent