Montserrat Volcano Observatory


Daily Report
Report for the period 16:00 on 25 March 1996
to 16:00 on 26 March 1996


A slight change in the nature and level of seismicity was observed during the period under review. There were nineteen (19) long period earthquakes, nineteen (19) rockfalls and three (3) regional events. A resurgence of small earthquakes that are thought to be associated with rock fracturing due to dome growth was also evident. About one hundred and thirty four (134) of these small events were recorded on the Gages and Chances Peak Seismographs. The southern and eastern EDM triangles were measured today. The very small changes measured were consistent with the recent trends and also remain within the instrumental error. Visual observations were made early this morning from the helicopter in excellent viewing conditions and subsequently from Chances Peak. The dome continues to steam and degas from various locations. The focus of activity has shifted from the two previously active areas (near Farrell's and to the north of Castle Peak) to two new areas located on the eastern and western sectors of the dome. Rockfalls may still continue to occur in the area north of Castle Peak but less frequently. The rockfalls in this area have been the source of the recent ash clouds.


Montserrat Volcano Observatory