Magnitude 7. 1 Earthquake Rocks Japan as Tsunami Warning Issued A magnitude 7. 1 earthquake struck southern Japan on Tuesday, prompting a tsunami warning for the coasts of the Ariake Sea and the Yatsushiro Sea.
The quake occurred in Kumamoto Prefecture at a depth of approximately 9. 7 kilometers.
Japan's experience with seismic activity is well documented, but the latest quake has raised questions about the effectiveness of its disaster preparedness measures.