After a 7.7-magnitude quake, Japan warns of slightly higher risk of a possible mega-quake
Summary
A strong earthquake with a magnitude of 7.7 struck off northern Japan, leading to a brief tsunami alert. Authorities warned that the chance of a larger, very powerful earthquake, called a mega-quake, is slightly higher than usual in nearby coastal areas.Key Facts
- The earthquake had a preliminary magnitude of 7.7.
- It occurred off the northern coast of Japan.
- A tsunami alert was issued but lasted only a short time.
- Japan’s Cabinet Office and Meteorological Agency gave the alert.
- They reported a 1% chance of a mega-quake happening soon after this quake.
- Normally, the chance of a mega-quake in this area is 0.1%.
- The quake happened near the Chishima and Japan trenches, underwater cracks in the Earth’s crust.
- A mega-quake means a much bigger and more damaging earthquake than usual.
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