The Eruption of Soufrière Hills Volcano, Montserrat, from 1995 to 1999

26 December activity andesite associated August avalanche block-and-ash flow blocks caused changes cloud conduit continued Crater crystal debris density depth developed diameter direction distribution dome collapse dome growth DRUITT early earthquakes effects eruption Eruption of Soufrière estimated et al extrusion fallout Figure flanks flow deposits formed fragmentation Galway's Geological Society Ghaut ground growth hazard height increased indicate initial Journal July June KOKELAAR lava dome layer lobe London magma major maps March mass material measurements monitoring Montserrat Mount November observed occurred October particles Peak period phase plume pressure produced pulse pyroclastic flows pyroclastic surge reached region River valley rockfalls samples seismic September signals Soufrière Hills Volcano SPARKS surface swarms Table tephra Unit upper values vent volume Vulcanian explosions Wall West White wind YOUNG Zone