5_Volcanism

5_Volcanism - LECTURE 5 VOLCANISM What is a volcano? From...

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LECTURE 5 VOLCANISM What is a volcano? •From word Vulcan , Roman god of fire and metal working Geologic landform where molten rocks from the planet’s interior are ejected to the surface Generic Volcano Features Central Vent Summit Crater Edifice Magma Chamber Parasitic Cones Fumaroles How do we know if a volcano is active? - Active – erupted during the last 10,000 yrs. - Inactive – no activity during the last 10,000 yrs. - Potentially active - volcanic activit between 10 ka – 1.65 Ma Types of volcanoes 0. Based on morphology and building materials 1
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Where can we find volcanoes? 1. Boundaries of lithospheric plates 2. Middle of plates: “Hot spots” What is a volcanic eruption? 0. ejection of 0. molten rock 1. fragmented rocks and ash AND/OR 2. gases 1. caused by 3. influx of magma from deeper source 4. melting of underlying rocks 5. exsolution of gases 2. accompanied by 6. earthquakes 7. ground deformation Characterizing eruptions 2
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Types of volcanic eruption Hawaiian and Strombolian
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5_Volcanism - LECTURE 5 VOLCANISM What is a volcano? From...

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