Arquivo para September 28th, 2021

Volcanoes, between science and superstitions

28 Sep

The volcano in the Canary Islands, which has been burning for more than a week, and for the time being just increasing the volume and quantity of glowing lavas have raised questions and fears, not everything is really right, volcanologists and geologists have no forecast for the volcano to cool down and not all superstitions came only from prophecies and apocalyptics.

The possibility of a megatsunami, starting from the middle of the Atlantic Ocean, the Pacific Ocean has more volcanoes and earthquakes in the so-called circle of fire (photo) than the Atlantic was studied after the Indonesia tsunami that gained notoriety, but it was Japan, which affected the Fukushima Plant the most amazing.

The warning came not from superstitious, but from British researchers in a 2001 article (Ward & Day, 2002), the article gained notoriety for directly citing the Canary Islands (see photo above), and was published in the scientific journal Yearbook of Science and Technology , carried out other studies in cases that have already happened, such as the 1st. April 1946 in the Aleutian Islands where there was a landslide similar to the one off the coast of Papua New Guinea.

Cited that the largest land displacement, which caused megatsunami, was the landslide in 1929 due to an earthquake in Newfoundland National Park, Canada, on the Burin peninsula, which reached the coast of Scotland and Holland, but only was noticed because of fragments that were deposited on the coasts of these countries.

The article carried out experiments by computer simulation, which shows that the efficiency of tsunami generation increases with the speed and volume of the landslide, and made a simulation precisely with the Cumbre Vieja volcano (fig. 3 above), on the island of La Palma (one of the Gran Canary Islands), and wrote verbatim: “continuous and recent movements of the flanks of a number of oceanic island volcanoes including Kilauea in Hawaii and Cumbre Vieja in La Palma in the Canary Islands are possibilities that these can break [the flanks] during an eruption in the not-too-distant future” (Ward & Day, 2001).

T he volume has increased since last Sunday (19/09) and one of the flanks opened, but it did not collapse and the lavas had not reached the sea until the present day yesterday.

We had other volcanoes during the year, in Italy Etna, in Russia the Ebeko volcano in the Kuril Islands and in Iceland the Fagradalsfjall, but these do not pose any danger, in the case of Iceland there was a period of interruption of air traffic in the region.

Other volcanoes in the world have manifested this year, in Africa the Nyiragongo in early June, in Indonesia the Sinabung in early March, in Guatemala the Fire Volcano, but the eruption has already ceased, there are others around the world, active volcanoes ( but not in eruption) there are more than a thousand altogether, Brazil is far from the tectonic plates that, in addition to volcanoes, cause earthquakes.

For a few hours the Cumbre Vieja Volcano stopped spouting lava, but it returned, whether the duration and volume of material will be sufficient for a tsunami depends on the intensity and duration, neither volcanologists nor geologists who follow the volcano can say with certainty.

Ward, N. and Day, Simon. Suboceanic Landslides. Steven Yearbook of Science and Technology,

Ward, N. and Day, Simon. (2001). Suboceanic Landslides. Steven Yearbook of Science and Technology, McGraw-Hill, Available in: ward&day.pdf (