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September 15 - up to 9 of magma may be gas Magma release...

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GLG 101 September 15, 2010 Lahars – tephra is readily moved by water as a debris flow. Known as lahars, these flows are often deadly. Lahars move rapidly (up to 50km per hr) They have the consistency of wet cement A distinct hazard to people living in volcanic valleys. Volcanic Gas:
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Unformatted text preview: up to 9% of magma may be gas Magma release – magma rises via a conduit to the surface. Craters – a bowl shaped depression atop a volcano. Craters are up to 500 m across; 200 m deep. Caldera – a gigantic volcanic depr4ession Form from massive eruptions...
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