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ERUPTIONS 2

Plinian Eruption

Keys:
1. Ash plume 2. Magma conduit 3. Volcanic ash rain 4. Layers of lava and ash
5. Stratum 6. Magma chamber

Caused by fragmentation of gassy magma, and are usually
associated with very viscous magmas.

Pel�an Eruption

Keys:
1. Ash plume 2. Volcanic ash rain 3. Lava dome 4. Volcanic bomb
5. Pyroclastic flow 6. Layers of lava and ash 7. Stratum 8. Magma conduit
9. Magma chamber 10. Dike

In Pel�an eruptions, a large amount of gas, dust, ash, and lava fragments are
blown out the volcano's central crater,�driven by the collapse of�rhyolite,�dacite,
and�andesite�lav dome�collapses that often create large�eruptive columns.

Surtseyan Eruption

Keys:
1. Water vapor cloud 2. Compressed ash 3. Crater 4. Water
5. Layers of lava and ash 6. Stratum 7. Magma conduit 8. Magma chamber
9. Dike

Surtseyan eruptions are the "wet" equivalent of ground-based�Strombolian eruptions,
but because of where they are taking place they are much more explosive.

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