An enormous 8.8 magnitude earthquake has hit off the far east of Russia – potentially the sixth largest on record.
The quake has triggered waves of up to 4m (13ft) in the Kamchatka Peninsula, where buildings were damaged and several people injured, officials said.
It has also led to tsunami fears across the Pacific, with warnings and alerts in place across Japan, parts of the US including Hawaii, California and Alaska, and the Philippines.
Follow live updates as widespread tsunami warnings issued
The US Geological Survey (USGS) said the earthquake was shallow at a depth of 19.3km (12 miles), and was centred about 125km (80 miles) east-southeast of Petropavlovsk-Kamchatsky, a city of 165,000 along the coast of Avacha Bay.
Here we look at how it compares to some of the highest magnitude quakes recorded by the USGS.
Biobio, Chile (1960)
A 9.5 magnitude earthquake – known as the Valdivia earthquake or Great Chilean earthquake – struck in a central region of Chile in 1960.
It is the largest ever recorded earthquake, and resulted in more than 1,600 deaths in the country and beyond, most of which were caused by the resulting large tsunami.
Thousands of others were injured.
Alaska (1964)
A 9.2 magnitude earthquake hit Alaska’s Prince William Sound in 1964, lasting for almost five minutes and becoming the largest recorded earthquake in the US.
There were huge landslides and towering waves which caused severe flooding, and the event was followed by thousands of aftershocks for weeks.
More than 130 people were killed.
Sumatra, Indonesia
A 9.1 magnitude earthquake and subsequent tsunami devastated Southeast and South Asia and East Africa in 2004.
It was the most disastrous earthquake in terms of fatalities, killing 230,000 people, including 167,000 in Indonesia, where entire communities were wiped out.
Tohoku, Japan
Another 9.1 magnitude earthquake struck off the coast of northeastern Japan in 2011, triggering a towering tsunami that smashed into the Fukushima nuclear plant.
This led to power and cooling systems being knocked out, and triggered meltdowns in three reactors.
More than 18,000 people were killed in the quake and tsunami. Some bodies have never been recovered.
Read more:
Quake and tsunami warnings: What we know so far
Powerful 8.8-magnitude earthquake causes tsunami
Kamchatka, Russia
A 9.0 magnitude quake resulted in a tsunami with 9.1m (30ft) waves hitting Hawaii in 1952, causing significant damage but no fatalities.
Biobio, Chile (2010)
Central Chile was hit by a 8.8 magnitude earthquake in 2010, lasting for 90 seconds and setting off a tsunami.
More than 500 people were killed in the disaster.
Esmeraldas, Ecuador
An 8.8 magnitude earthquake resulted in a tsunami that killed about 1,500 people in Ecuador in 1906.
Its effects were felt for miles along the Central American coast and as far as San Francisco and Japan.
Alaska (1965)
A magnitude 8.7 quake struck Alaska’s Rat Islands in 1965, causing an 11m (35ft) high tsunami. It only resulted in relatively minor damage, including cracks in buildings and an asphalt runway.
Tibet
At least 780 people were killed when a magnitude 8.6 earthquake struck in 1950, destroying dozens of villages, including at least one that slid into a river.
Major landslides jammed the Subansiri River in India, and a deadly 7m (23ft) wave was created when the water eventually broke through.
Sumatra, Indonesia
An 8.6 magnitude earthquake struck off the west coast of northern Sumatra in Indonesia in 2012.
The quake caused little damage, but it did increase pressure on a fault that had been the source of the devastating 2004 tsunami.
