Back to today’s briefing

Story perspectives

Japan Issues Rare Mega Quake Advisory After 7.6 Tremor

12/14/2025

46 5 Full Breakdown

Summary

Story summary

A rare advisory was issued after a powerful December 13, 2025 earthquake struck Japan's northern coast, signaling a 1 percent chance of a mega quake within the next week.
The advisory follows a magnitude 7.6 quake near Aomori Prefecture.
A mega quake is defined as any quake stronger than 8 on the Richter scale, using historical data.
The meteorological agency issued a similar advisory in 2024 that expired without incidents.

1 of 1

Story summary

A rare advisory was issued after a powerful December 13, 2025 earthquake struck Japan's northern coast, signaling a 1 percent chance of a mega quake within the next week.
The advisory follows a magnitude 7.6 quake near Aomori Prefecture.
A mega quake is defined as any quake stronger than 8 on the Richter scale, using historical data.
The meteorological agency issued a similar advisory in 2024 that expired without incidents.