ESS 106 Lecture Notes - Lecture 10: Landslide, Metasomatism, Debris Flow
26 Jan 2016
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Document Summary
Lava flows, ash fall, acid rain, pyroclastic flows, debris avalanche/volcanic landslide, lahar (water-born, very fluid) Debris avalanche volcanoes are much more susceptible due to its (cid:1) weak structure. Collapse of an unstable slope aka landslide. Large mass of rock and soil that fall, slide, or flow very rapidly under the force of gravity. Disintegrates during movement into fragments ranging in size from small particles to enormous blocks hundreds meters across. Characteristics: huge 1km^3 100 km^3: fast: >100 km/hr (60mph, huge + fast = great momentum. Can travel up slopes and across divides. A pyroclastic flow and a lahar differ from a debris avalanche. A pyroclastic flow is a hot flow formed mainly of material of magmatic origin, while a debris avalanche is not a hot flow and generally consists of older material. The carrier-phase of lahar is water, while a debris avalanche is not saturated with water, although it entrains water.
