TY - JOUR
T1 - The relationship between degassing and ground deformation at Soufriere Hills Volcano, Montserrat
AU - Watson, I. M.
AU - Oppenheimer, C.
AU - Voight, B.
AU - Francis, P. W.
AU - Clarke, A.
AU - Stix, J.
AU - Miller, A.
AU - Pyle, D. M.
AU - Burton, M. R.
AU - Young, S. R.
AU - Norton, G.
AU - Loughlin, S.
AU - Darroux, B.
N1 - Funding Information:
The authors gratefully acknowledge the MVO, BGS and NERC for supporting the COSPEC measurement campaign and NERC for studentship (under grant number GT4/96/60/EO). BV also acknowledges the support of NSF. We would particularly like to thank Bill Rose and an anonymous referee for thorough reviews, which have greatly improved the paper.
PY - 2000/5
Y1 - 2000/5
N2 - We examine the correlations between SO2 emission rate, seismicity and ground deformation in the month prior to the 25 June 1997 dome collapse of the Soufriere Hills Volcano, Montserrat. During this period, the volcano exhibited a pattern of cyclic inflation and deflation with an 8-14 h period. We find that SO2 emission rates, measured by COSPEC, correlate with the amplitude of these tilt cycles, and that higher rates of SO2 emission were associated with stronger ground deformation and enhanced hybrid seismicity. Within tilt cycles, degassing peaks coincide with maximum deformation gradients. Increases in the amount of gas in the magma conduit feeding the dome, probably due to increases in volatile content of ascending magma volume can account for the observed increases in tilt amplitude, hybrid seismicity and SO2 emission rate. (C) 2000 Elsevier Science B.V. All rights reserved.
AB - We examine the correlations between SO2 emission rate, seismicity and ground deformation in the month prior to the 25 June 1997 dome collapse of the Soufriere Hills Volcano, Montserrat. During this period, the volcano exhibited a pattern of cyclic inflation and deflation with an 8-14 h period. We find that SO2 emission rates, measured by COSPEC, correlate with the amplitude of these tilt cycles, and that higher rates of SO2 emission were associated with stronger ground deformation and enhanced hybrid seismicity. Within tilt cycles, degassing peaks coincide with maximum deformation gradients. Increases in the amount of gas in the magma conduit feeding the dome, probably due to increases in volatile content of ascending magma volume can account for the observed increases in tilt amplitude, hybrid seismicity and SO2 emission rate. (C) 2000 Elsevier Science B.V. All rights reserved.
KW - COSPEC
KW - Cyclic activity
KW - Degassing-deformation correlation
KW - Soufriere Hills Volcano
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U2 - 10.1016/S0377-0273(99)00187-0
DO - 10.1016/S0377-0273(99)00187-0
M3 - Article
AN - SCOPUS:0033941416
SN - 0377-0273
VL - 98
SP - 117
EP - 126
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
IS - 1-4
ER -