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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


  1. • 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

  2. 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

  3. � 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

  4. � 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

  5. � 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

  6. � 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

  7. � 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

  8. � 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

  9. • measure for volume, eruption column, duration SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards

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