Table 1 Mayon Volcano Alert Levels and Province Required Action
PHIVOLCS | APSEMO | ||
|---|---|---|---|
ALERT LEVEL | Description | Interpretation and Recommendations | APSEMO Required Actionsa (2014) |
0 No Alert | Quiet | No eruption in foreseeable future. Entry in the 6-km radius Permanent Danger Zone (PDZ) is not advised because phreatic explosions and ash puffs may occur without precursors | Normal Stage |
1 Abnormal | Low level unrest | No eruption imminent. No entry in the 6-km radius PDZ | Alert Stage |
2 Increasing Unrest | Moderate unrest | Unrest probably of magmatic origin; could eventually lead to eruption 6-km radius PDZ may be extended to 7 km in the sector where the crater rim is low | Monitoring Stage |
3 Increased Tendency Towards Eruption | Relatively high unrest | Magma is close or at the crater. If trend is one of increasing unrest, eruption is possible within weeks Extension of Danger Zone in the sector where the crater rim is low will be considered | Evacuation Status (6-km PDZ), but preparedness stage in the Extended High Risk Zone (HRZ) in the Southeast Quadrant |
4 Hazardous Eruption Imminent | Intense unrest | Hazardous eruption is possible within days. Extension of Danger Zone to 8 km or more in the sector where the crater rim is low will be recommended | Evacuation Stage. Evacuation of the population in the areas declared within the extended HRZ |
5 Hazardous Eruption | Hazardous eruption ongoing | Occurrence of pyroclastic flows, tall eruption columns and extensive ashfall. | Emergency Response Stage. Full implementation of PDCC Emergency Response Plan. Complete evacuation of residents of barangays covered by the extended danger zones around Mayon Volcano |