A major earthquake with a preliminary magnitude of 7.2 has triggered a tsunami warning for the southern Alaska peninsula.

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.

The earthquake, with a preliminary magnitude of 7.3, struck south of Sand Point, a community of about 600 people on Popof Island.