| Volcanic Activity |
Alert Stage |
Actions by Administrators |
| Background seismicity with no new surface manifestation of volcanic
activity |
0 WHITE |
- All zones occupied. Review and update emergency plans on an ongoing
basis.
|
| Low-level local seismic activity, ground deformation and mild phreatic
activity |
1 YELLOW |
- Maintain readiness of key personnel, systems and procedures. Keep stock
of critical supplies
- Local evacuations may be necessary in Zone A.
- Zone B and C on standby
|
| Dome building in progress, periodic collapses generating rockfalls
and occasional pyroclastic flows. Moderate level of seismic activity with
no sudden changes. |
2 AMBER |
- Zone A: No access
- Zone B: Access limited to short visits by residents, officials and
approved visitors with rapid means of exit.
- Zone C: Daytime only visits for by residents, approved commercial activities
and agriculture.
- Zone D: Day and night-time occupation by residents, high level of alert
maintained.
- Zone E, F: Full occupation by residents with national contingency plan
for evacuation in readiness
- Zone G: Full occupation
|
| Change in style of activity anticipated within a few days. Pyroclastic
flows common with associated light ash fall. High level of seismic activity. |
3 ORANGE |
- Zone A, B: No access
- Zone C: Access limited to short visits by residents and workers with
means of rapid exit
- Zone D: Daytime occupation for essential services and agriculture,
residents allowed access in daytime. Essential services operate with standby
transport and evacuation plans in place.
- Zone E: Full occupation with high level of alert maintained. Schools
operate with standby transport.
- Zone F: Full occupation by residents with contingency plan for evacuation.
Warn of ashfalls in Zone E and F.
- Zone G: Full occupation
|
| Major dome collapse under way, with large pyroclastic flows and heavy
ash fall. Explosive event possible if the activity continues. |
4 RED |
- Montserrat Standing Operating Procedures for Red Alert in place.
- All schools closed as required. People with special needs removed from
Zone E & F.
- Zone A, B, C, D: No access, rapid evacuation of all remaining persons.
- Zone E: Rapid evacuation. Warn of potential for gravel, pumice and
ash fall.
- Zone F: Warn of potential for gravel, pumice and ash fall.
- Zone G: Full occupation.
|
| Ongoing large explosive eruption with heavy ash fall. |
5 PURPLE |
- Zone A, B, C, D, E: No access, rapid evacuation of all remaining persons.
- Zone F: Initiate evacuation. Warn of continued gravel, pumice and ash
fall
- Zone G: Warn of potential for ash hazards
|
