P.W. Francis J. Barclay T. J. Casadevall C. A. Gardner B. Darroux M. A. Davies P. Delmelle G.E. Norton A.J.H. Maciejewski C.M.M. Oppenheimer J. Stix I.M. Watson S.R. Young 1998 <div class=""><div class="article-section__content en main"><p>Correlation spectrometer measurements of sulfur dioxide (SO₂) emission rates during the current eruption of the Soufriere Hills volcano, Montserrat, have contributed towards identifying different phases of volcanic activity. SO₂<span>&nbsp;</span>emission rate has increased from &lt;200 tonnes per day (td⁻¹; &lt;2.3 kgs⁻¹) in the early stages of dome growth to &gt;550 td⁻¹<span>&nbsp;</span>(&gt;6.4 kgs⁻¹) after July 1996, with the uncertainty associated with any individual measurement ca. 30%. Significantly enhanced SO₂<span>&nbsp;</span>emission rates have been identified in association with early phreatic eruptions (800 td⁻¹<span>&nbsp;</span>(9.3 kgs⁻¹)) and episodes of vigorous dome collapse and pyroclastic flow generation (900 to 1500 td⁻¹<span>&nbsp;</span>(10.4 to 17.4 kgs⁻¹)). SO₂<span>&nbsp;</span>emission rate has proved a useful proxy measurement for magma production rate. Observed SO₂<span>&nbsp;</span>emission rates are significantly higher than those inferred from analyses of glass inclusions in phenocrysts, implying the existence of a S-rich magmatic vapour phase.</p></div></div> application/pdf 10.1029/98GL01406 en American Geophysical Union Monitoring so2 emission at the Soufriere Hills volcano: Implications for changes in eruptive conditions article