Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake that follows a larger one ...

A strong earthquake struck southwestern Japan, the U.S. Geological Survey said, prompting authorities to issue a tsunami ...

This map shows the locations ... and nearby Genkai was also on alert, Japan's NHK TV network reported. Japan's Meteorological Agency initially estimated the earthquake at a magnitude of 6.9 ...