Montserrat Volcano Observatory

Morning Report
Report for the period 16:00 15 April
to 07:00 16 April 1997
The current alert level is ORANGE

The volcano has been generally quiet overnight, with a swarm of hybrid earthquakes starting during the early morning and some minor rockfall activity.

The earthquake swarm started at 5:30 am with a small hybrid earthquake. This was followed by 3 large and a number of small hybrid earthquakes, and the swarm is still continuing. Seismic signals have indicated only minor rockfall activity overnight, the largest signal being late yesterday afternoon associated with an ash cloud which drifted northwards with the wind.

The volcano is again quite clear this morning, with a moderate level of gas and steam production.

Despite the apparent low level of activity, the volcano remains in an unstable state, with further dome growth in the southern region above the Galway's Wall. Despite yesterday's period of high rockfall activity, another dome collapse with extensive pyroclastic flows in the White River is expected within the next week. This collapse will probably not be larger than the recent collapses. Residents of Montserrat should remain alert, and listen to Radio Montserrat for further updates. Ash masks should be worn in ashy environments. Visits to zone C should be restricted to those that are essential. All of Zone A, which includes Long Ground and St Patrick's, is very dangerous and should not be entered under any circumstances.

Montserrat Volcano Observatory