Volcanoes_4 - EOSC 114 / Guillaume Carazzo Earthquakes...

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Unformatted text preview: EOSC 114 / Guillaume Carazzo Earthquakes Volcanoes Landslides Storms Waves Impacts Recap Last session we examined some of the main products of volcanoes and their dangers: lavas pyroclastic fall deposits We also attempted to classify the SIZE of eruptions on the VEI scale. Volcanoes Lecture 1- Volcano Basics Lecture 2- Types of volcanoes Lecture 3- Volcanic hazards I Lecture 4- Volcanic hazards II Lecture 5- Volcano monitoring and predicting eruptions Learning Goals At the end of todays session, you will: have examined the major volcanic hazards: LAVAS (previous lecture) PYROCLASTIC FALL (previous lecture) PYROCLASTIC FLOWS LAHARS SECTOR COLLAPSE POISONOUS GASES and used this knowledge to MAP major hazards around different volcanoes. Hazards: 3. Pyroclastic flows Pyroclastic flows are avalanches of hot pyroclastic material, air, and gas which descend under the influence of gravity Their velocity is generally very high (50-500 km/hr) This example is a flow from Mt. St. Helens Origins of pyroclastic flows a/ Small fountain b/ Collapse of a volcanic column e.g., Mt St Helens; Vesuvius Ash fall deposit Pyroclastic flow deposit Origins of pyroclastic flows d/ Lateral blast e.g., Mt St Helens; Mt Pele c/ Dome collapse e.g., Mt Unzen; Montserrat Lava domes The lava is silica-rich and thus highly viscous (sticky) and cannot...
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Volcanoes_4 - EOSC 114 / Guillaume Carazzo Earthquakes...

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