GEOL 106 Lecture 33: Landslides
1 Oct 2017
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Of gravity: the downslope movement of solid earth"s materials under just the influence (cid:498)landslides(cid:499) anywhere! Everywhere you look there are slopes where. Earthquakes and volcanoes predominantly at plate tectonic boundaries. Risk analysis: understand the hazard (in general) Eg rain on a slope, earthquakes, human activities flow slip fall. Classification chart mechanism flow, slip, and fall velocity low to high. Based on: mechanism (flow slip and fall) Mudflow (water saturated debris: earthflow (debris, earthflow with slump (rotational) Rock or debris avalanche: rock slide, debris. Classification of mass wasting rotational slip e. g. south nation river, 1971 rock avalanche e. g. yungay, peru mudflow and earthflow saint-jean-vianney, quebec, 1971 creep solifluction creep in permafrost terrains permafrost permanently frozen ground. Locate and determine the nature of potentially dangerous slopes. Use of air photographs look for ancient slide scars. Can use carbon-14 dating of dead organic matter. What are the geologic/geographic factors/controls: nature of rocks and soils, slope steepness, presence of water.
