U.S. Geological Survey
Soufri?re Hills (United Kingdom) - Report for 23 February-1 March 2011
MVO reported that during 18-25 February activity from the Soufri?re Hills lava dome was at a low level. Of 31 volcano-tectonic earthquakes detected by the seismic network, 18 occurred in a small swarm on 23 February. On 24 February a pyroclastic flow that traveled less than 1.5 km on the N flank originated from one of the highest parts of the dome, and travelled down the collapse scar formed on 11 February. The event produced an extensive pyroclastic surge and a relatively strong ash plume that rose to an altitude of about 1.5 km (5,000 ft) a.s.l. The Hazard Level remained at 3.
Source: Montserrat Volcano Observatory (MVO)