Magnitude of volcanic eruptions

1. Tectonic processes of volcanic eruptions

a) magma consisting of dissolved gases is less dense

b) forces its way upward and breaks through weak areas in the Earth’s crust

2. Magnitude of volcanic eruptions

a) determined by amount of dissolved gases and magma viscosity

b) stratovolcanoes erupt violently and shield volcanoes emit magma gently

3. Measuring volcanic eruptions

a) Volcanic Explosivity Index measures relative explosivity of historic eruptions

b) considers the volume of ejected materials, height of eruption cloud and duration of the eruption

Look at the world's top 10 volcanic eruptions. Why do you think that those with very high VEI like the one in Novarupta, Alaska did not result in any death?

https://www.sciencefocus.com/planet-earth/biggest-volcanic-eruptions 

https://www.historyandheadlines.com/mt-pinatubo-eruption-devastates-the-philippines/

• As shown in the video, Mount Sinabung is an active volcano. It has erupted in both 2020 and 2021. 

• The eruption is accompanied by clouds of ash and dust particles which extend high into the atmosphere. 

• The eruption also produced a pyroclastic flow down the sides of the volcano. 

• It is an explosive eruption which is characteristic of a stratovolcano.

https://volcano.oregonstate.edu/how-big-are-eruptionshow-big-are-eruptions