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Explosive dynamics of violent Strombolian eruptions: the eruption of Paricutin Volcano 1943-1952 (Mexico)
Pioli, L and Erlund, E and Johnson, E and Cashman, K and Wallace, PJ and Rosi, M and Delgado Granados, H (2008) Explosive dynamics of violent Strombolian eruptions: the eruption of Paricutin Volcano 1943-1952 (Mexico). Earth and Planetary Science Letters, 271. pp. 359-368.
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Violent Strombolian is a term that was originally used by MacDonald [Macdonald, G.A., 1972. Volcanoes,
Prentice-Hall inc., Englewood Cliffs, New Jersey, 510 pp.] to describe energetic Strombolian eruptions such as
some of the more explosive phases of the 1943–1952 eruption of Parícutin Volcano (Michoacán, central
Mexico), eruptions that disperse ‘showers of incandescent cinder and bombs…to heights of a few thousand
feet’ and during which ‘a great black ash cloud rises above the volcano’. Here we re-examine accounts of the
Parícutin eruption and compare them with new stratigraphic data and physical features of the tephra deposit
to improve the definition of violent Strombolian activity and to better elucidate the mechanisms that can
cause this distinctive eruptive style. We find characteristic violent Strombolian activity to be strongly
pulsatory, with production of moderately high eruption columns (2–6 km) that eject abundant fine ash. Also
characteristic is simultaneous lava effusion from lateral vents. At Parícutin, violent Strombolian activity
occurred at magma eruption rates of 104 to 105 kg/s, intermediate between Strombolian and subplinian rates.
A progressive decline in magma flux during the eruption led to a decrease in the relative proportion of both
erupted tephra and glassy vesicular fragments in the fallout layers. Eruption characteristics can be explained
by varying degrees of shallow gas segregation from water-rich basaltic magma that modulate both
transitions between two-phase flow regimes in the upper conduit and effusion of degassed lava from the
base of the cone.
|Journal or Publication Title:||Earth and Planetary Science Letters|
|Page Range:||pp. 359-368|
|Identification Number - DOI:||10.1016/j.epsl.2008.04.026|
The definitive version is available at http://www.sciencedirect.com
|Date Deposited:||08 Dec 2010 04:35|
|Last Modified:||18 Nov 2014 04:15|
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