Geology notes

Geology notes - Geology notes Seismic cycle 1. quiescent...

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Geology notes Seismic cycle – 1. quiescent period 2. increasing minor seismicity 3. foreshocks 4. quake measure – tiltmeters, GW, radon, seismic velocity, seismic gap relative age superposistion original horizontality cross-cutting inclusions 12/3/08 Volcanos Lava flows don’t move that fast – not biggest hazard Basaltic eruptions cuz low visc Volcanic Ash – pyroclastic Viscous eruption (andesite and rhyolite) Vegetation, lungs, surface water, structural damage, transportation Gases – H2S, CO, CO2 Climate change Lahars – hot mudflows 17/3/08 Mass Wasting – slope degradation Slope Safety = Strength/Shear Stress Change safety – water Roots Change water, weight, cohesion Erosion Tectonics Thawed Ice Change in composition – tough minerals break down
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19/3/08 Types of Movement Falls Slides – slump Fine grained, high water pressure, steep slope Flows Gabions – box o rock Clay – flakes have positive cation (usually sodium) at ends, so mid are negative Flocculation – clays stick together at right angles cuz charged Lots of water room Once salt is removed, no ‘glue’, so all just collapses (high water to clay ratio) 31/3/08 Soil – surficial material ‘Altered’ by physical and chemical and biological processes forms horizons soil profile how to create horizons – input/output, move within soil (translocation),
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This note was uploaded on 04/08/2008 for the course GEOG 215 taught by Professor Herb during the Spring '08 term at Middlebury.

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Geology notes - Geology notes Seismic cycle 1. quiescent...

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