Topic 3 - Volcanoes.pdf

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Department
Earth and Atmospheric Sciences
Course
EAS205
Professor
Solweig Balzer
Semester
Fall

Description
Volcanoes OverviewBasics and distributionComposition and viscosityVolcanic types and formsAssociated risks and hazardsPredictionPrevention and mitigationBasicsMagma or lavaSource from upper mantle 50 to 250 km in depthHigh temperature low pressure regionComposition determinesActivity typeShapePossible types of hazardsCompositionDetermined by the geological settingMixture of SiO Fe Mg and other elements 2 Amount of SiO in the magma determines 2 Melt type Melt viscosityGas release ability Viscosity as a Hazard LavaMafic Intermediate Felsic Rockbasalt andesiterhyolite SiO4550 5060 60 2Viscosity lowmediumhighWhere you shouldnt beAreas with silicaenriched magmas continental and water rich materialsSubduction zonesContinental hot spots or mantle plumesDistribution Hot SpotsTypes of Volcanic ActivityLava composition determines geometry MaficFissure eruptionsShield volcanoesCinder cones
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