In July, one of the strongest earthquakes ever recorded struck off the Kamchatka peninsula, triggering tsunamis up to four metres (12 feet) high across the Pacific and sparking evacuations from Hawaii to Japan.
The magnitude 8.8 quake was the largest since 2011, when a magnitude 9.1 tremor off Japan caused a tsunami that killed more than 15,000 people.
July’s quake prompted authorities in Japan to order almost two million people to head to higher ground.
Tsunami warnings were also issued across the region, before being rescinded or downgraded.