Viscosity amount of dissolved Volatiles Volume low viscosity - - PowerPoint PPT Presentation

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Jul 26, 2023 201 likes •301 views

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

SLIDE 1

SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards

Viscosity
amount of dissolved Volatiles
Volume

low viscosity (shield) less water less vigorous more water more vigorous effusive lava fountains

SLIDE 2

SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards

low viscosity (shield) high viscosity (strato) less water less vigorous more water more vigorous effusive lava fountains small explosions large explosions; pyroclastic flows

SLIDE 3

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

SLIDE 4

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

source: woodpress

SLIDE 5

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

source: USGS source: wikipedia

SLIDE 6

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

source: wikipedia

SLIDE 7

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.

SLIDE 8

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.

Mt St. Helens 1980; source: wikipedia

SLIDE 9

SIO15-13: Lecture 8 Volcanic Eruption Styles and Hazards

measure for volume, eruption column, duration