Montserrat Volcano Observatory

Morning Update
0700H 07 July, 1996

The overnight seismic activity at the Soufriere Hills Volcano followed the recent trend - several small to moderate sized rockfalls and a few isolated hybrid earthquakes. There were also two periods of fairly vigorous broadband tremor. These periods of tremor coincided with overnight storms. The pattern of seismicity suggests that the lava dome inside English' s Crater is still actively growing.

There were two notable rockfall events during the update period - at 20:09 and 20:10 on July 6. Both events had durations of about one minute. Long period events were absent from the records overnight and there were a few isolated hybrid events. Two periods of fairly vigorous broadband tremor wererecorded. These were from about 22:10 to 23:30 on July 6 and from 23:53 on July 6 until 01:00 on July 7. They ocurred during the overnight thunderstorms and were probably associated with an increase in steam venting.

Visibility was poor yesterday evening and this morning, with the volcano obscured by clouds.

The threats posed by the Soufriere Hills Volcano continues at the same or greater severity as over the past several months. The Tar River, Long Ground and Whites areas to the east and the upper Fort Ghaut, Gages Village and Upper Amersham areas to the west are still extremely hazardous. People should not enter these areas under any circumstances because they put themselves and others at direct risk of very serious injury or death. People are urged to keep visits to the evacuated zone to an absolute minimum.

Montserrat Volcano Observatory