Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 on 20 November
to 16:00 on 21 November 1995

Seventeen (17) earthquakes have been located during this period. The seismicity was more scattered than has been observed over the last few days. The number of earthquakes has decreased since yesterday, although many small earthquakes are still being recorded by the Gages seismic station. The earthquakes occurred in the depth range 0-6 km (i.e. within 3.5 miles of the surface). A few earthquakes occurred in the Corkhill area. One of these, which measured magnitude 2.5 on the Richter scale occurred at 15:07 today, and was felt at the Observatory and in Plymouth.

The Tar River EDM lines was measured today, and showed only a very small change from yesterday's measurement. Low cloud prevented measurement of the Chance's Peak EDM lines.

GPS (Global Positioning System) surveys continue to be carried out each day. One instrument was again installed at Chance's Peak during today, to measure the distances between Chance's Peak, Tar River and St. George's Hill. These results will not be processed until tomorrow. Results from 19 Nov showed changes of less than 2 mm (a tenth of an inch) for the lines from Reid's Hill to St George's Hill, Reid's Hill to Tar River and St George's Hill to Tar River.

No visual observations from the Crater rim were made today because of the low cloud covering the volcano.

Montserrat Volcano Observatory