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Unformatted text preview: commonly announces a new eruption or
eruptive phase in Hawaii,
undegassed magma arrives at
the surface. Subsequent phases show
much smaller fountains or
none at all. Gas disrupts magma into
“clots” Ratio of clot:gas was 1:70 in Pu’u O’o Typically produces Scoria
Cones Unsolidified clots may coalesce to form flows. Hawaiian Fountaining of Etna 3 Stromboli, Eolian Islands, Italy Strombolian Eruption Style 4 Strombolian Eruptions Strombolian style refers to discontinuous
repeated at intervals of a
few per minute to a few
Gas:clot ratio 105:1
10-2 m3 to 102 m3
Results from single large
bubble reaching the
surface and bursting Strombolian Eruption of Etna 5 Vulcano, Eolian Islands, Italy Vulcanian Eruption Style 6 Vulcanian Eruptions Discrete, very violent explosions Capable of ejecting
enormous blocks and
shock waves Muzzle velocities ≤ 400 m/s
(supersonic) Speeds suggest 100x
overpressure May produce ash clouds and pyroclastic flows High proportion of nonjuvenile material in ejecta.
Sakura-jima, Japan Vulcanian Explosions...
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This document was uploaded on 03/04/2014 for the course EAS 458 at Cornell University (Engineering School).
- Fall '06