Japan "80% chance of Nankai Haegok earthquake within 30 years"

The Japanese government's Earthquake Investigation Committee has raised the probability of a major earthquake of magnitude 8-9 in Nankai Sea Valley in southern Japan to 80% from 70-80% in the next 30 years.

As of January 1 this year, the Earthquake Investigation Committee determined that the probability of the Nankai Sea Great Earthquake occurring within 30 years was 75-82% and changed the related expression to "80%."

Previously, the Earthquake Investigation Committee changed the expression related to the probability of the Nankai Sea Valley earthquake from about 70% to 70-80% in 2018.

The Nankai Sea Valley is an eijin terrain from the sea off Shizuoka Prefecture, west of the Japanese metropolitan area, to the waters of southern Shikoku and eastern Kyushu, and the Sea Valley refers to a deep valley under the sea.

Large earthquakes are known to occur every 100 to 150 years in this area.