A tsunami of 0.3 feet was observed on Shemya Island, Alaska, in the Aleutian Islands.
The U.S. Geological Survey said the quake's epicenter was 61 miles (98 kilometers) west of Camana in Arequipa province.
The quake, struck in the Bearing Sea, in northern Pacific Ocean between the tip of the US's Aleutian Islands and Russia's Kamchatka, says the US Geological Survey which recorded the quake as 7.7.
It is not yet clear what kind of damage the earthquake has caused, if any.
"An undersea earthquake of magnitude 7.6 has occurred at 9.34AM AEST on Tuesday 18 July 2017 near the Bering Sea", it reports.
"Based on preliminary earthquake parameters... hazardous tsunami waves are possible for coasts located within 300 km (186 miles) of the earthquake epicentre", said the US Pacific Tsunami Warning Centre.
A strong 7.7 magnitude earthquake has struck Komandorskie Ostrova region of Russia, triggering a tsunami warning for that nation's coast.
The quake was followed by several aftershocks, including a couple above magnitude 5.0.
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