Megaquakes in the Nankai Trough have occurred every 100 to 200 years over the past 1,400 years, with the most recent one recorded in 1946, according to Japan’s Headquarters for Earthquake ...
The Nankai Trough, where the Philippine Sea Plate is slipping under the Eurasia Plate at the bottom of the sea off the south-west coast of Japan, produces massive earthquakes about every 100-150 ...