For the first time, scientists have directly observed the movement of a slow earthquake at the bottom of the ocean. These imperceptible events on a human timescale could play a key role in ...

Megathrust earthquakes are large earthquakes that occur on faults found along the boundaries between tectonic plates. The ...

Japan completed the world’s first real-time ocean floor earthquake detection system in June 2025, giving 20 seconds more ...

Japan's weather agency said Wednesday that data from an offshore tsunami gauge in the Pacific Ocean is currently unavailable, ...

Japan Meteorological Agency's Nankai Trough quake advisory panel said the chance of a bigger earthquake striking after a magnitude 7 tremor was once in a few hundred cases, relatively higher than ...

The Nankai Trough has produced large earthquakes roughly every 100 to 150 years, a study indicated last year. Japan’s Earthquake Research Committee said in January 2022 said there was a 70% to ...

The Japanese government stated that much more must be done to prepare for a potential 'megaquake' in order to decrease the expected death toll of up to 300,000 people.

A Japan Meteorological Agency (JMA) expert panel on Aug. 8 released an advisory that there was a "relatively higher chance" of a Nankai Trough megaquake as powerful as magnitude 9, after a ...

The most recent Nankai Trough quake happened in 1946 when a magnitude 8 tremor and 6.9-metre (22.6-ft) tsunami waves killed 1,330 people. ($1 = 147.0700 yen) (This story has been refiled to fix a ...

Japan issued a “megaquake advisory” following a 7.1-magnitude earthquake off its coast. That raised the risk of a larger quake on the Nankai Trough, an underwater subduction zone.