Volcanoes

Which type of volcano is the most dangerous?

A volcano is only dangerous if there are people living nearby for whom it can be dangerous. The Mount Erebus in Antarctica, which has been constantly erupting since 1972, is therefore harmless. Furthermore, a volcano is more dangerous as it erupts more violently or explosively.

Around 50 volcanoes erupt every year. Most of them are of the basaltic type, which rarely causes major problems. That is because basaltic magma flows very evenly, and almost never flows faster than a human can run. According to measurements, the lava from Mauna Loa in Hawaii only reaches 16 kilometers per hour.

However, there are also eruptions of volcanoes with rhyolitic and andesitic magma. These types contain more silicon than the basaltic magma, which produces a tough, thick current. As a result, a kind of plug can arise in the volcano, which only disappears when the pressure has risen so high that the volcano erupts.

However, Magma is not the only factor to determine to what extent a volcano is dangerous. After an eruption, pyroclastic clouds of glowing ash can flow down the mountain at lightning speed. Such a cloud blotted out all life in Pompeii in the year 79.

Dangerous gases can also flow from the cracks in volcanoes. Volcano gases cause 3% of all volcano-related deaths. Finally, a deadly aslawine can arise from a fierce rain shower. In 1985 it cost 23,000 lives at Nevado del Ruiz, Colombia.

Magma determines volcano power

Volcanoes erupt when there is overpressure of magma in the room. The various types of magma determine the course and the danger of the eruption.

Shield volcanoes (A) consist of light-flowing basaltic magma with few gases, which flow from one central pipe. Eruptions are rarely dangerous.

Cinder cones (B) consist of volcanic rocks, embers, which are formed from gas-rich magma. When the pressure drops, gas escapes and the magma explodes.

Strato volcanoes (C) consist of a layer of ash / embers and lava. When the tough magma erupts, the explosion is followed by a lava flow.

The five most dangerous volcanoes

Video: Top 10 Most Dangerous Volcanoes (January 2020).

Popular Posts

Category Volcanoes, Next Article

5 reasons why Proxima b is the colony par excellence
Exoplanets

5 reasons why Proxima b is the colony par excellence

1. The planet looks like the earth © M. Kornmesser / ESO Proxima b is a rocky planet, just like the earth, but it is about 30% heavier and maybe a little bigger. Astronomers estimate that the planet has a radius that is 80-150% the size of the Earth. 2. Short travel time Proxima b revolves around the Proxima Centauri star, which is only 4.2 light-years away from the Earth.
Read More
Mysterious planetary system does not adhere to the rules
Exoplanets

Mysterious planetary system does not adhere to the rules

500 Light years away from us is a planetary system that is at odds with the existing theories about the origin of planets around a young star. The CI Tau star is only 2 million years old, but has already collected four large gas planets. Astronomers from the University of Cambridge in Great Britain viewed the planetary system with the ALMA telescope.
Read More
5 deadly exoplanets
Exoplanets

5 deadly exoplanets

Like the earth, they revolve around a star, but the similarities kind of stop there. Astronomers are finding more and more planets that revolve around stars other than the sun, so-called exoplanets. Some resemble the earth, but the vast majority are totally unsuitable for humans. Below we provide an overview of five of the worst places to be human.
Read More