When an earthquake strikes, most of us imagine shaking buildings, cracked roads, and frightened people running for safety.

The underwater monument near Yonaguni Island has puzzled divers and researchers since its discovery in 1986. Submerged ...

An earthquake of magnitude 6.1 hit Hokkaido in Japan on Saturday afternoon, the country's Meteorological Agency said, adding that it hit at a depth of 20 km (12 miles).