The US Pacific Tsunami Warning Center said Monday evening that a magnitude 7.8 earthquake had occurred off the coast of Russia's Kamchatka Peninsula.
"Based on preliminary earthquake parameters... hazardous tsunami waves are possible for coasts located within 300 km (186 miles) of the earthquake epicenter," the centre wrote in an official message.
Tsunami waves, however, were unlikely to reach Kamchatka's eastern coast, some 500 km (310 miles) away.
The quake was followed by several aftershocks, including a couple above magnitude 5.0.
The earthquake was originally reported as a 7.4 magnitude, but it was subsequently upgraded to 7.8.
On Twitter, the centre confirmed that it was not expecting tsunami conditions to impact North American coasts.