the essential Sunday 19 September, the Cumbre Vieja volcano erupted on the Spanish island of La Palma, in the tourist archipelago of the Canaries . A rash that has been calculated in different ways. La Dépêche du Midi explains how to monitor the eruption of a volcano.
The second way to spot a potential eruption is in the deformation of the ground. This moves when the magma rises to the surface. “In La Palma for example, since 2017 there have been a few seismic swarms at 30 kilometers, so we were far from the eruption, then the last one was took place on 11 September, at 12 kilometers deep, the probability of an eruption was therefore greater “.
Finally, two other techniques exist. The first, gas tracking. As the magma rises, it loses gas, which can be spotted. “For example at great depth, it is carbon dioxide, then sulfur when it approaches the surface”, explains Ludovic Leduc. Finally, the activity of a volcano can be noted by satellite. A method which is used in particular for volcanoes located in uninhabited places. “In the desert for example, a large amount of infrared is noted by the satellite, therefore a high temperature, which shows a probable eruption” concludes the specialist.