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Lead scientist Dr Ricardo Ramalho, of Columbia University in New York, said: 'Our point is that flank collapses can happen extremely fast and catastrophically, and therefore are capable of triggering giant tsunamis.
Clues left by the megatsunami included boulders the size of delivery vans (pictured) that had been carried up to 2,000 feet inland and nearly 650 feet above sea level on Santiago Island, 34 miles (55km) from Fogo Clues left by the megatsunami included boulders the size of delivery vans that had been carried up to 2,000 feet inland and nearly 650 feet above sea level on Santiago Island, 34 miles (55km) from Fogo.
But overnight and into dawn, 10 more tremors were recorded from the huge Cumbre Vieja volcano, which sits on La Palma.
One of them reported a magnitude of 2.1, which took place just after midnight.
Like the killer asteroid and the "big one" in California, this is not a speculation. If you enjoy "extreme nature" documentaries, you will probably enjoy Mega Tsunami.
LA PALMA VOLCANO WARNING The warning comes from Dr Steven Ward, of the University of California, and Dr Simon Day, of the Benfield Greig Hazard Research Centre at University College London.
They found that if the Cumbre Vieja – an active but dormant volcano – were to erupt, the western flank of the mountain could tumble into the sea.
Writing in Geophysical Research Letters, they said a build-up of groundwater could destabilise a block of rock up to 500 cubic km in size, which could break off, smashing into the sea at up to 350 km an hour (220 mph).
This eruption could cause the landslide, which will unleash a deadly wall of water, initially almost 3,000ft high and several miles wide, to hurtle towards the UK’s southern shores, at speeds of up to 800 km an hour (500 mph).
However experts have assured residents that this sort of seismic movement is “absolutely normal”.