Between cyclic eruptions (VUELCO meeting, Barcelona, 2013)

20 Mar 2013 | Contributor(s): Fabian Ben Wadsworth

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...

The onset of dense plug formation during cyclic eruptions at Soufrière Hills Volcano, Montserrat (COV 7, 2012)

20 Mar 2013 | Contributor(s): Fabian Ben Wadsworth, Betty Scheu

Cyclicity at active volcanoes is commonly observed and interpreted to reflect periods of vesiculation and gas pressurisation beneath more dense degassed plugs. In 1997, Vulcanian eruptions from Soufrière Hills volcano (SHV), Montserrat, had a mean repose time of 9.5 hours. We consider the...

Timescales of dyke widening and draining during an eruption at Red Crater, New Zealand (COV 7, 2012)

20 Mar 2013 | Contributor(s): Fabian Ben Wadsworth

Near-surface basaltic dykes may become unstable when buoyancy and overpressure are not maintained and solidification not fully accomplished. Additionally temporal variation of the dyke geometry such as widening may further compromise stability and induce draining. A 5-10 m wide, variably dipping...