TOKYO — A strong earthquake with a preliminary magnitude of 6.9 has hit southwestern Japan, the country’s Meteorological Agency said Monday, while warning the public to stay away from coastal areas because of a tsunami threat.

A powerful earthquake with a preliminary magnitude of 6.9 struck southern Japan on Monday night, sending tremors through the region and prompting tsunami advisories. The seismic event occurred at 9:19 p.

TOKYO -- A tsunami advisory was issued for part of southwest Japan after a magnitude 6.6 earthquake struck Monday, but the warnings to stay away from coastal areas were later lifted. A few instances of minor damage were reported. Japan’s Meteorological Agency initially estimated the magnitude was 6.9 but later revised it to 6.6.