Montserrat: MVO report for the period midday 04 May to midday 11 May 2007

Originally published
Visual observations revealed very little change to the overall dome structure during the period, and lava extrusion appears to have ceased. Nevertheless, the amount of material here is sufficient to generate pyroclastic flows and surges capable of impacting on the lower Belham Valley and lower lying areas up to lower Happy Hill and the Old Towne ridge.

Recorded seismic activity remained very low throughout the period. The seismic network recorded 4 rockfall and 2 long-period rockfall signals.

The sulphur dioxide (SO2) flux rate during the reporting period was low, ranging between a minimum of 48 tones per day (t/d) to a maximum of 179 t/d. The average of 125 t/d is significantly below the longterm average for the eruption (550 t/d).

The alert level remains at 4.

Residents of Montserrat and visitors to the island are advised to tune into ZJB Radio 88.3 or 95.5 FM for up-to-date information on the volcano.

Access to all areas on the lower flanks of the Belham Valley and further south, and south of Jack Boy Hill to Bramble airport and beyond is prohibited at all times (readers are refereed to the updated risk map). The maritime exclusion zone around the southern part of the island extends 4 km off shore from Spanish Point to Roches Yard on the east side of the volcano, 2 km offshore from O'Garras to Sturge Park on the south-west, and 2 km offshore from Isles Bay to Old Road Bluff on the west (maritime risk map).

For further explanations of the volcanic phenomena described, and information about the Soufrière Hills Volcano and the ongoing eruption, please look at the rest of the MVO website.