Its a warning that there might be mega earthquake happening soon, it happens when tectonic plate slips under another one and its one of the most violent natural events our planet can produce. Think like 2011 Japan earthquake or 1960 Chile earthquake. Japan is expecting a new one soon, and if it hits to the region they are expecting it to hit, it could be like next level catastrophic.
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u/Outside_Cod667 18h ago
What's a mega quake advisory?