A magnitude 7.7 earthquake struck off the coast of northern Japan on Monday, triggering a brief tsunami alert and an advisory regarding an increased risk of a major “megaquake” in the region.
- Megaquake Risk: Probability increased to 1%, compared to the normal 0.1%.
- Tsunami Impact: Waves up to 80 centimeters recorded in Iwate prefecture.
- Casualties: Two people injured in Aomori and Iwate after falling.
Megaquake Advisory and Preparedness
The Japan Meteorological Agency and the Cabinet Office reported a 1% chance of a megaquake occurring in the next week or so following the seismic activity near the Japan and Chishima trenches. Officials clarified that the advisory is not a prediction but a call for heightened preparedness.
Residents in 182 towns along the northeastern coasts have been urged to maintain their daily routines while staying alert. Prime Minister Sanae Takaichi advised citizens to verify their evacuation routes, designated shelters, and emergency food supplies.
This marks the second such advisory for the region in recent months, following a 7.5-magnitude earthquake in December that did not result in a megaquake.
Impact and Infrastructure
The earthquake occurred off the coast of Sanriku at approximately 4:53 p.m. at a depth of 19 kilometers (11 miles). While the Japan Meteorological Agency measured the quake at 7.7 magnitude, the U.S. Geological Survey recorded it as a 7.4 magnitude.
Tsunamis were detected at two ports in Iwate prefecture, with the highest wave measuring 80 centimeters (2.6 feet) at Kuji port. All tsunami alerts and advisories were lifted shortly after.
The Fire and Disaster Management Agency confirmed two injuries resulting from falls in Aomori and Iwate. Additionally, Shinkansen bullet train services between Tokyo and northern Japan were temporarily suspended, leaving passengers stranded on platforms and in cars.
Safety and Historical Context
The Nuclear Regulation Authority confirmed that all nuclear power plants and related facilities in the region remain intact with no abnormalities detected.
The event serves as a reminder of the March 11, 2011, disaster, when a magnitude 9.0 earthquake and massive tsunami caused more than 22,000 deaths and triggered a nuclear crisis in Fukushima.
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