The activity at the Soufriere Hills Volcano over the last 24 hours has been fairly quiet. The activity once again consisted of rockfalls, small pyroclastic flows and long period earthquakes.
As for most of the week, yesterday (Thursday) visibility was poor and no views of the dome obtained. However scientists are informing everyone that there is steady, moderate growth of the dome and that its active area is in the southwest above Galways Wall.
The long period GPS survey was completed yesterday and the results processed. The survey was undertaken to see how much deformation there has been on Montserrat's mountains due to volcanic activity. The site on Chances Peak has moved 73 mm towards the southwest during the course of this year. The site at Farrell's on the crater rim has continued to move northeast but at a much slower rate than previously.
Some EDM measurements were possible yesterday and two lines were measured. The Lower to Upper Amersham line has extended by 14 mm since late March and the Lower Amersham to Chance's Steps has shortened by 30 mm since early April. These results confirm that the lines show a trend to shortening.
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