Between cyclic eruptions: The densification of bubble-bearing magma
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Abstract
Volcanic unrest begins with precursory signals which are the detectable manifestation of dynamic subsurface changes. In 1997, Vulcanian eruptions from Soufrière Hills volcano (SHV), Montserrat, had a mean repose time of 9.5 hours and produced remarkably regular precursory signals. Cyclic Vulcanian eruptions are associated with inflation and deflation and commonly interpreted as periods of gas pressurisation and depressurisation in partially degassed plugs. Inflation and deflation could …