Unique strainmeter observations of Vulcanian explosions, Soufrire Hills Volcano, Montserrat, July 2003

B. Voight, D. Hidayat, S. Sacks, A. Linde, L. Chardot, A. Clarke, D. Elsworth, R. Foroozan, P. Malin, G. Mattioli, N. McWhorter, E. Shalev, R. S.J. Sparks, C. Widiwijayanti, S. R. Young

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Abstract

Five Vulcanian explosions were triggered by collapse of the Soufrire Hills Volcano lava dome in 2003. We report strainmeter data for three explosions, characterized by four stages: a short transition between the onset of disturbance and a pronounced change in strain; a quasi-linear ramp accounting for the majority of strain change; a more gradual continued decline of strain to a minimum value; and a strain recovery phase lasting hours. Remarkable ∼800 s barometric gravity waves propagated at ∼30 m s-1. Eruption volumes estimated from plume height and strain data are 0.32-0.42 × 106, 0.26-0.49 × 106, and 0.81-0.84 × 10 6 m3, for Explosions 3-5 respectively, consistent with quasi-cylindrical conduit drawdown <2 km. The duration of vigorous explosion is given by the strain signature, indicating mass fluxes of order 107 kg s-1. Conduit pressures released reflect static weight of porous gas-charged magma, and exsolution-generated overpressures of order 10 MPa.

Original languageEnglish (US)
Article numberL00E18
JournalGeophysical Research Letters
Volume37
Issue number11
DOIs
StatePublished - Jun 2010

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Voight, B., Hidayat, D., Sacks, S., Linde, A., Chardot, L., Clarke, A., Elsworth, D., Foroozan, R., Malin, P., Mattioli, G., McWhorter, N., Shalev, E., Sparks, R. S. J., Widiwijayanti, C., & Young, S. R. (2010). Unique strainmeter observations of Vulcanian explosions, Soufrire Hills Volcano, Montserrat, July 2003. Geophysical Research Letters, 37(11), [L00E18]. https://doi.org/10.1029/2010GL042551