TY - JOUR
KW - Granular flow
KW - Montserrat
KW - Soufrière Hills Volcano
KW - Submarine pyroclastic flow
KW - turbidity current
AU - Jessica Trofimovs
AU - Stephen Sparks
AU - Peter Talling
AB - The 12 to 13 July 2003 andesite lava dome collapse at the Soufrière Hills volcano, Montserrat, provides the first opportunity to document comprehensively both the sub-aerial and submarine sequence of events for an eruption. Numerous pyroclastic flows entered the ocean during the collapse, depositing approximately 90\% of the total material into the submarine environment. During peak collapse conditions, as the main flow penetrated the air\textendashocean interface, phreatic explosions were observed and a surge cloud decoupled from the main flow body to travel 2 to 3 km over the ocean surface before settling. The bulk of the flow was submerged and rapidly mixed with sea water forming a water-saturated mass flow. Efficient sorting and physical differentiation occurred within the flow before initial deposition at 500 m water depth. The coarsest components (\~60\% of the total volume) were deposited proximally from a dense granular flow, while the finer components (\~40\%) were efficiently elutriated into the overlying part of the flow, which evolved into a far-reaching turbidity current.
BT - Sedimentology
M1 - 3
N2 - The 12 to 13 July 2003 andesite lava dome collapse at the Soufrière Hills volcano, Montserrat, provides the first opportunity to document comprehensively both the sub-aerial and submarine sequence of events for an eruption. Numerous pyroclastic flows entered the ocean during the collapse, depositing approximately 90\% of the total material into the submarine environment. During peak collapse conditions, as the main flow penetrated the air\textendashocean interface, phreatic explosions were observed and a surge cloud decoupled from the main flow body to travel 2 to 3 km over the ocean surface before settling. The bulk of the flow was submerged and rapidly mixed with sea water forming a water-saturated mass flow. Efficient sorting and physical differentiation occurred within the flow before initial deposition at 500 m water depth. The coarsest components (\~60\% of the total volume) were deposited proximally from a dense granular flow, while the finer components (\~40\%) were efficiently elutriated into the overlying part of the flow, which evolved into a far-reaching turbidity current.
PB - Blackwell Publishing Ltd
PY - 2008
SN - 1365-3091
SP - 617
EP - 634
T2 - Sedimentology
TI - Anatomy of a submarine pyroclastic flow and associated turbidity current: July 2003 dome collapse, Soufrière Hills volcano, Montserrat, West Indies
UR - http://dx.doi.org/10.1111/j.1365-3091.2007.00914.x
VL - 55
ER -