This follows Japan’s unprecedented advisory warning of heightened risks for a megaquake in this seabed zone. Such advisories emphasize ongoing concerns about potential seismic threats in the area.

An earthquake with a preliminary magnitude of ... the agency said. Ehime and Kochi prefectures were hit by the quake with an intensity of 6 on Japan's 1-7 scale, the JMA said.

The threat of a tsunami is hanging over Japan after an earthquake of 6.9 magnitude ... as well as the nearby Kochi prefecture, are in the danger zone. A wave of about one meter is expected in ...

The first earthquake to register an intensity of lower ... the town of Ainan in Ehime Prefecture and the city of Sukumo in Kochi Prefecture, both on Shikoku. The island had never experienced ...

Most of Japan is located on the Pacific Ring of Fire – a zone of intense seismic and volcanic activity – making it vulnerable to frequent earthquakes. Last summer, the Japanese weather agency ...