• Viscosity • amount of dissolved Volatiles • Volume low viscosity (shield) less water less vigorous effusive more water more vigorous lava fountains SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
low viscosity high viscosity (shield) (strato) less vigorous less water small explosions effusive more vigorous more water large explosions; lava fountains pyroclastic flows SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
� lava: large amounts; very low-viscosity � non-explosive � lava: low-viscosity � non-explosive � lava: small amounts; medium-viscosity � “peacefully explosive” � cinder cones � lava: high-viscosity � moderately violent SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
� lava: large amounts; very low-viscosity � non-explosive � lava: low-viscosity � non-explosive � lava: small amounts; medium-viscosity � “peacefully explosive” � cinder cones source: woodpress � lava: high-viscosity � moderately violent SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
� lava: large amounts; very low-viscosity � non-explosive � lava: low-viscosity � non-explosive source: USGS source: wikipedia � lava: small amounts; medium-viscosity � “peacefully explosive” � cinder cones � lava: high-viscosity � moderately violent SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
� lava: large amounts; very low-viscosity � non-explosive � lava: low-viscosity � non-explosive source: wikipedia � lava: small amounts; medium-viscosity � “peacefully explosive” � cinder cones � lava: high-viscosity � moderately violent SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
� lava: very high viscosity � violent eruptions � very high eruption column (> 10km) Mt. Vesuvius, Pompeii 79 A.D. SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
� lava: very high viscosity � violent eruptions � very high eruption column (> 10km) Mt. Vesuvius, Pompeii 79 A.D. SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards Mt St. Helens 1980; source: wikipedia
• measure for volume, eruption column, duration SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards
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