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What Happens During a Volcanic Eruption?

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Marissa Fraher

on 6 June 2016

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Transcript of What Happens During a Volcanic Eruption?

What Happens During a Volcanic Eruption?
By: Delaney Cotter
What is a Volcanic Eruption?
A volcanic eruption is one of the most hazardous and glorious natural disasters. When a volcano erupts, the volcano sends out ash clouds, lava and even volcanic bombs. There is a high risk of danger from slow moving lava; though, the lava might move slowly, it is very dangerous and can cause a lot of damage to property and human life.
After the Eruption
3 Stages of Volcanic Eruptions:
Magmatic eruptions
Phreatomagmatic eruptions
Phreatic eruptions
Pressure stabilizes.
Gases and the ash cloud in the atmosphere may cause a global average temperature drop of as much as 0.1 degree Celsius.
Depending on the volcano, a caldera may form as the volcano side collapses inward into the emptied magma chamber.
However, this doesn't necessarily occur, as the magma chamber may refill.
Pressure builds in the magma chamber.
Some gases, such as carbon dioxide and sulphur dioxide may be released from the vent prior to eruption.
The ground may tilt, or be slightly more elevated as magma pushes upwards from the chamber / mantle.
Both of these are detectable using GPS or tintometers.
Geologists often spray paint a straight line on a volcano side - if it is broken, bent, twisted etc. Then there is evidence of activity.
Before the Eruption

Pressure is released as lava may be explosively released.
Depending on the volcano, lava may be viscous or runny (which determines whether explosive activity) and may produce ash clouds, lahars / mudflows and pyroclastic flows.
May also be in the form of volcanic bombs.
Some volcanoes produce huge fountains of lava e.g.
During the Eruption:
6 types of volcanic eruptions:
Lava Domes
Volcano Eruption. Earth Facts and Information. N.p., n.d. Web. 06 June 2016.
Frequently Asked Questions about Volcanoes. Frequently Asked Questions about Volcanoes. N.p., n.d. Web. 06 June 2016.
Types of Volcanic Eruptions. Types of Volcanic Eruptions. N.p., n.d. Web. 06 June 2016.
Untitled Document. Untitled Document. N.p., n.d. Web. 06 June 2016.
What Happens When a Volcano Erupts. What Happens When a Volcano Erupts. N.p., n.d. Web. 06 June 2016.
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