Montserrat Volcano Observatory

Daily Report
Report for the period 5 p.m. 12 July
to 5 p.m. 13 July 1998

The volcano has slightly more active today with 25 rockfall signals and 6 volcano-tectonic earthquakes being recorded by the seismic stations. The rock falls were observed inside the scar in the dome formed by the collapse on July 3rd. Two periods of extended ash venting were also recorded.

The results of COSPEC measurements completed yesterday indicated a sulphur dioxide flux of 4150 tonnes per day. This is a particularly high value and may be artificially high due to dust in the plume as the measurements were being made and due to strong winds.

The Farrells Wall reflector was shot today from Windy Hill. The line showed a 4cm lengthening since mid-May. This would suggest a reduction in pressure and loading on the wall since that time. GPS stations were run at Whites, Windy Hill and Roches today as well as the permanent sites. The data from these stations will be processed soon as a large network.

Ash levels today could not be measured due to a power outage across the island this morning.

Residents should continue listening to Radio Montserrat in case there are more sudden developments in the state of the volcano.

Montserrat Volcano Observatory