Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 07 September
to 16:00 08 September 1996

The activity at the Soufriere Hills volcano has continued at about the same relatively low level as observed during the previous 24 hours, with volcano-tectonic earthquakes and small- to moderate-sized rockfalls dominating the picture.

Seventy three (73) rockfalls and 25 volcano-tectonic earthquakes were recorded during this reporting period. Most of the rockfalls occurred during the period from 16:46 to 23:28 on 07 September, with the largest events being recorded at 20:10 and 20:32. The volcano-tectonic earthquakes occurred in two swarms from 03:44 to 05:15 and from 13:50 to 16:00 today and were located at shallow depths beneath English's Crater. The background tremor level on all seismic stations was generally higher than usual because of the windy conditions associated with the passage of Tropical Storm Hortense.

The dome was not visible throughout the day because of the low cloud cover on the volcano.

EDM measurements were not made today because of the low cloud cover and rain. The COSPEC is still out of commission.

Further rockfalls and pyroclastic flows will occur as the lava dome continues to grow within English's Crater, but indications at the moment are that the pyroclastic flows will be confined to the Tar River valley area. Areas affected by associated ashfalls will obviously depend on the direction and strength of the wind at the time. Old ash that has not been washed away by the recent rains is constantly being remobilised by the wind and motorists. Dust masks should be worn at all times in ashy environments, and drivers should exercise caution and consideration for other road users.

The Tar River Valley and surrounding areas continue to be extremely hazardous, and should not be entered under any circumstances. We urge individuals who persist in ignoring this advice to think very seriously before making trips to these highly hazardous zones.

Montserrat Volcano Observatory