Archive · 10 Dec 2025
Japan Warns of Megaquake This Week
Japan's weather agency has warned that a very big earthquake, called a megaquake, might happen soon.
This could cause huge waves called tsunamis along the entire Pacific coast of Japan.
The warning is the highest level and is the first time it has been issued since 2022.
People living near the coast have been told to be ready to leave their homes quickly if needed.
They should know the best routes to evacuate, have emergency supplies like food and water, and make sure heavy things in their homes are secure.
This warning comes after a big earthquake happened on Sunday in the Pacific Ocean near Aomori, which sent small tsunami waves ashore and caused some injuries.
Authorities are still monitoring the situation and warn that more earthquakes could happen in the coming days.
The Prime Minister reported 30 injuries and a residential fire, emphasizing the need for disaster preparedness.
Japan's weather agency issued a highest-level warning of a megaquake that could strike soon.
The warning follows a 7.6 magnitude earthquake off the coast of Aomori on Sunday.
Authorities have asked people near the Pacific coast to be ready to evacuate at short notice.
A megaquake is defined as a tremor measuring magnitude 8.0 or greater.
People are advised to review evacuation routes, gather emergency supplies, and secure heavy items in their homes.
- Who
- Japan's weather agency and authorities
- What
- Warning of a megaquake and potential large tsunamis
- When
- Warning issued on Tuesday, with potential impact this week
- Where
- Entire Pacific coast of Japan, from Hokkaido to Chiba
- Why
- Due to the recent 7.6 magnitude earthquake and the possibility of a larger quake
Preparatory Measures
Potential Overreaction
Evacuation Readiness
Preparatory Measures
Authorities emphasize the importance of being prepared for a potential megaquake and tsunami, advising residents to review evacuation routes and gather emergency supplies.
Potential Overreaction
Some residents may view the warnings as excessive, arguing that the immediate risk is low and the preparations are unnecessary.
- Magnitude of Megaquake
- 8.0 or greater
- Affected Coastline
- Entire Pacific coast of Japan
- Warning Issued By
- Japan's weather agency
- Previous Megaquake Warning
- First time since 2022
- Recent Earthquake
- 7.6 magnitude on Sunday
- Location of Recent Earthquake
- Pacific Ocean off Aomori
- Tsunami Waves
- 40–50cm
- Evacuation Warnings
- About 90,000 residents
- After-quakes
- 5.5, 5.0, and 4.8 magnitudes
- Injuries Reported
- 30
- Fire Incidents
- 1 residential fire
Sources
Japan warns of MEGAQUAKE this week: People handed a list of practical steps, large tsunamis expected
Massive 7.5-magnitude earthquake strikes Japan, several buildings damaged
Japan Earthquake Live Updates: ‘Megaquake’ Alert After Devastating 7.5 Magnitude Tremor
After Japan issued first official earthquake warning, tremors prompt 90,000 people to take shelter
Indian Woman In Tokyo Shares Harrowing Experience During Japan Earthquake: "It Was So Strong"
‘Megaquake’ alert issued in Japan after 7.6 magnitude jolts, tsunami warning
Japan’s 30 Metre Megaquake Tsunami Advisory: Nearly 2 Lakh Lives At Risk | What It Means
