A magnitude 6.6 earthquake struck near the coast of the Kamchatka region in the far east of Russia on Sunday, the German Research Centre for Geosciences (GFZ) said.
The quake was at a depth of 10 km (6.21 miles), GFZ said. It initially reported a magnitude of 6.2 for the earthquake.
A separate earthquake measuring 6.7 magnitude struck off the east coast of Kamchatka at a depth of 10 km, shortly following the previous quake, according to GFZ data.
The European Mediterranean Seismological Centre (EMSC) shows the second earthquake to be of 7.4 magnitude. GFZ later updated the quake to a 7.4 magnitude.
Russia's state-run TASS news agency reported on Sunday, citing local emergency services, that waves of up to 60 cm could reach the sparsely populated Aleutsky District on the Commander Islands.
Waves of up to 40 cm may affect the Ust-Kamchatsky region in eastern Kamchatka, while the Petropavlovsk-Kamchatsky urban district - the most densely populated area in the south-eastern part of the peninsula and home to the regional capital - might see waves of up to 15 cm.
The US National Tsunami Warning Center cancelled a tsunami watch for the state of Hawaii.
Russia says it downed 142 Ukrainian drones
This came after Russia's defense ministry and the mayor of Moscow said it had downed 142 drones overnight, including 27 over the Moscow region.
The drones were reportedly shot down over a number of regions in the European part of Russia, as well as over the Black Sea.
The latest attacks included four drones headed toward the Russian capital, which were downed on Sunday morning, Moscow Mayor Sergei Sobyanin said on Telegram around 10:00 a.m. local time.
According to Russia's aviation watchdog Rosaviatsia, four major airports serving Moscow - Sheremetyevo, Vnukovo, Domodedovo and Zhukovskiy - were affected, resulting in 134 flights being redirected.
By 10:00 a.m. Moscow time, only two airports remained closed to air traffic - Vnukovo in the Moscow region and Grabtsevo in the Kaluga region.