A lightly populated stretch of Alaska ’s southern coast was under a tsunami warning Wednesday after a strong earthquake was felt throughout the region, and officials in the Pacific Northwest were evaluating whether there was any threat to coastlines there. Early measurements put the quake’s magnitude at 7.3.

A 7.3 magnitude earthquake was recorded off the Alaska Peninsula on Wednesday afternoon, July 16. The U.S. Geological Survey recorded the earthquake off Sand Point, Popof Island, which is located in the center of the Alaska Peninsula,