The Pacific Tsunami Warning Center has announced a warning for Russia’s Kamchatka Peninsula following two earthquakes — the more significant one having a magnitude of 7.4 — that occurred in the sea close by on Sunday.

The bigger quake was recorded at a depth of 12 miles and was situated 89 miles east of Petropavlovsk-Kamchatsky, a city with 180,000 residents, as reported by the US Geological Survey.

A few minutes earlier, a quake with a magnitude of 6.7 was recorded nearby.

The German Research Center for Geosciences (GFZ) reported double earthquakes exceeding a 6.5 magnitude, hitting near the coast of Kamchatka, in Russia’s far east, early on Sunday.

It measured the quakes at 6.6 and 6.7 and the depth of both at 6 miles.

Measurements of earthquakes often vary in the first hours after they occur.

There were no immediate reports of casualties.

On Nov. 4, 1952, a magnitude 9.0 quake in Kamchatka caused damage but no reported deaths despite setting off many 30-foot waves in Hawaii.