Japan lifts megaquake advisory after a magnitude 7.0 earthquake struck on December 8, causing minor injuries and small tsunami waves. The Japan Meteorological Agency (JMA) reported tsunami heights of up to 70 centimetres (28 inches) and confirmed more than 40 people sustained injuries. No major damage to buildings or infrastructure was recorded.
Following the tremor, the JMA issued a rare advisory, warning of an increased risk of a megaquake — defined as magnitude 8.0 or higher — in northern Japan. Residents were advised to prepare emergency supplies and evacuation plans.
JMA official Issei Suganuma confirmed that Japan lifts megaquake special warning period at midnight on Tuesday. He emphasized that while the advisory has expired, residents should remain alert for any potential aftershocks or related seismic activity.
Experts explained that aftershocks of magnitude 7.0 or higher carry a one percent chance of triggering a megaquake within seven days. The advisory applied primarily to the Hokkaido-Sanriku coastal region, known for its vulnerability to offshore megathrust quakes.
Government disaster prevention guidelines estimate that a future offshore megaquake in this area could trigger a tsunami up to 30 metres high, potentially killing up to 199,000 people. It could also destroy 220,000 buildings and cause economic losses of around 31 trillion yen ($200 billion).
Despite the expiration of the advisory, authorities continue to stress vigilance. Suganuma stated, “Japan lifts megaquake warning, but this does not eliminate future seismic risks. Residents must stay prepared.”
Local authorities have increased monitoring and disaster response readiness across northern coastal prefectures. Residents are urged to maintain emergency kits, stay informed through official alerts, and participate in local evacuation drills.
With Japan lifts megaquake advisory now in effect, citizens can resume normal activities while keeping precautionary measures in mind.
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