The Soufrière Hills Volcano (SHV), Montserrat, West Indies, is an active andesitic dome-building volcano at the northern end of the Lesser Antilles volcanic arc. The ongoing eruption, characterized by cyclic growth and collapse of an andesite lava dome with associated pyroclastic flows (PF), vulcanian explosions, and debris flows, began on 18 July 1995 (Young et al. 1998; Aspinall et al. 1998) after a three-year period of precursor seismic activity.

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Prior to this eruption, volcanic activity in Montserrat was monitored by the Seismic Research Unit (SRU), based at the University of West Indies, St. Augustine, Trinidad, as part...

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