On October 26 in 1971 the Cumbre Vieja volcano on the Canary Islands shot into life in an eurption which lasted over three weeks.
It followed days of seismic activity with up to four movements per minute. A day before the eruption a huge tremor hit.
Canary Islands Association of Volcanology said the quake had such intensity it moved television sets.
The group added on Facebook: “The next day, the tremors continued, but from midmorning a seismic calm was observed that lasted until 3 o’clock in the afternoon.
“Intense subterranean noises could be heard and the earth opened up forming a fissure of several hundred meters, by which the magma began to flow.”
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The eruption, which came from the volcano’s opening Teneguía, then continued until November 18 and saw a major evacuation.
Today there are fears for another eruption on La Palma after the region was hit a series of tremors.
Two separate seismic swarms hit the Canary Islands, including 44 earthquakes over the course of 14 hours on October 12.
Movements have culminated in the area around Teneguia Princess hotel rising by about 1cm to the south and 3.5cm upwards, according to GPS sensors regulating ground deformation.
Scientist Stefan Scheller said: “If we assume the magma accumulation lies below the seismic swarm and thus raises the ground above.
“A circular elevation of the ground about 7 km around the centre means a quantity of raised rock with a volume of approximately 5 million m³, which corresponds to approximately 12.5 million tons of rock.”
Experts in the region have played down the recent activity.
However, a team are currently in the region assessing the volcano.
And a BBC documentary in 1990 sparked fears a La Palma eruption would see the island collapse, causing a mega-tsunami to be sent hurtling towards both Britain and America.
Experts from the University of California and University College London said if Cumbre Vieja – which active but dormant – were to come alive the western flank of the mountain could tumble in the ocean.
At 1,949 metres, Cumbre Vieja is one of the most active volcanoes in the Canaries.