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A warning system for extremely large earthquakes (magnitude 8.0 or higher) that may cause widespread destruction.
政府はメガ地震注意を強化し、国民の防災意識を高めるためのキャンペーンを実施した。
The government strengthened the megaquake alert system and launched a campaign to raise public disaster awareness.
This system is part of Japan's comprehensive earthquake early warning (EEW) infrastructure.
This term is specific to Japan's disaster management systems and may not be used in other countries.
Always use this term in formal contexts when referring to official earthquake warnings.
Combination of 'mega' (from English) + '地震注意' (earthquake alert)
Primarily used in technical and governmental contexts related to disaster preparedness.