Tokyo — A strong earthquake with a preliminary magnitude of 6.9 hit southwestern Japan on Monday, triggering public warnings to stay away from coastal areas because of a tsunami advisory, which was later called off. There were no immediate reports of damage. Residents in some coastal areas were told to evacuate as a precautionary measure. One man was slightly injured in Kyushu after falling down some stairs, NHK TV reported. Trains stopped running in Miyazaki Station, stranding passengers. NHK said a tsunami, estimated to be as high as 1 meter, reached land within 30 minutes of the quake. The waters