A 6.9-magnitude earthquake off Japan's northeast coast triggered tsunami warnings, coastal evacuations and renewed fears of a larger seismic threat, as experts pointed to ongoing tectonic instability along the Pacific Ring of Fire.
The tremor struck off Aomori prefecture late Friday morning, prompting the Japan Meteorological Agency to issue a tsunami advisory that was later lifted after waves remained limited. Still, the quake added to mounting concern following a far stronger earthquake earlier in the week.
