Dome observations suggest low extrusion rates at the start of the reporting period, with growth continuing to focus to the east, with a lava lobe growing in that direction and the majority of rockfall and pyroclastic flow activity occurring in the SE to NE sector. Photographs taken on 6 April of the east of Montserrat clearly demonstrate slightly elevated extrusion rates with lobe development on the east side of the dome. One moderate-size pyroclastic flow occurred at around 10:30 (local time) on Sunday 2 April, resulting in minor ash fall to the west of the island.
During the reporting period the seismic network recorded 507 rockfall signals, 66 long period - rockfall signals, 38 long period earthquakes and 3 volcano-tectonic earthquake.
Sulphur dioxide fluxes varied between and 1481 tonnes per day (t/d) on 1 April, falling to 281 t/d on 4 April. The average for the reporting period was 578 tonnes per day, which is slightly higher than the long tem average of 500 tonnes per day. The hydrogen chloride to sulphur dioxide ratio was measured using the FTIR on 4 & 5 April giving ratios of 2.3 and 2.6.