MVO reported that activity at Soufrière Hills increased during 9-19 May. The seismic network recorded 17 rockfalls. An eruptive event on 13 May produced an ash plume to an altitude of 3 km (10,000 ft) a.s.l. and was accompanied by a single long-period earthquake. A blue sulfur dioxide plume was also noted. Ash emissions from two areas in the Gages vent to the W were observed on 15 May, but may have started on 14 May. The resultant ash plume rose about 200 m above the lava dome and drifted W. A small rockfall was noted and gentle roaring noises were reported. A new fumarolic area was seen on the SE side of Chances Peak. Ash emissions from Gages vent continued on 16 May. The Alert Level remained elevated at 4 (on a scale of 0-5).
Based on information from MVO and observations of satellite imagery, the Washington VAAC reported that steam plumes with small amounts of ash continued during 17-19 May and drifted N and WNW.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”