One hundred and sixty (160) earthquakes have been located during this period. The seismicity was mainly concentrated at depths of 0 to 3 km beneath Soufriere Hills. The nature of the earthquakes is consistent to the type that is associated with rock fracturing due to slow dome growth.
A blanket of low level cloud allowed only one EDM line measurement to be made today. At Tar River very little shortening was recorded on the line.
GPS (Global Positioning System) surveys continue to be carried out each day. The results of recent surveys up to this morning indicate that little or no changes occurred on the lines that join the Tar River, St. George's Hill and Reid's Hill stations.
Visual observations were attempted from the rim of English's Crater both this morning and this evening, but the low cloud cover again presented any sighting of the active areas within the crater. However, the sound of breaking rocks and small landslides could heard coming from the direction of the July 18 vent. Based on this observation and recent changes in the EDM and GPS surveys the scientists are of the opinion that the dome activity may be migrating towards the July 18 vent.
Note: Processing of earthquake locations for the period 16:00 on 19 Nov to 16:00 on 20 Nov has been completed; a total of 286 earthquakes were located for this period, occurring in the depth range 0 to 2.5 km (0 to 1.5 miles) beneath the Soufriere Hills volcano.