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Kanlaon Volcano Alert Level Scheme
Monday, 28 December 2015 17:07

ALERT

CRITERIA

INTERPRETATION/RECOMMENDATION

0

No Alert (NORMAL)

All monitored parameters within background levels. Unremarkable level of volcanic earthquakes occurring within the volcano area.

 

Quiescence; nno magmatic eruption is foreseen. However, there are perennial hazards (sudden explosions, rockfalls and landslides) within the four (4) kilometer-radius Permanent Danger Zone (PDZ) that may occur suddenly and without warning.

1

Low Level of 

Volcanic Unrest

Slight increase in volcanic earthquake and steam/gas activity.  Sporadic explosions from the summit crater or new vents. Notable increase in the temperature, acidity and volcanic gas concentrations of monitored springs and fumaroles. Slight inflation or swelling of the edifice.

Hydrothermal, magmatic, or tectonic disturbances may be underway. The source of activity is shallow, near the summit crater or in the vicinity of the edifice. Entry into the PDZ must be prohibited.

2

Moderate Level of Volcanic Unrest

Elevated levels of any of the following parameters: volcanic earthquake, temperature, acidity and volcanic gas concentrations of monitored springs and fumaroles, steam and ash explosions from the summit crater or new vents, inflation or swelling of the edifice.

Probable intrusion of magma at depth, which may or may not lead to magmatic eruption. Entry within PDZ must be prohibited.

3

High Level of Volcanic Unrest

Sustained increases in the levels of volcanic earthquakes, some of which may be perceptible.  More energetic and frequent steam/ash explosions. Sustained increases in the temperature, acidity and volcanic gas concentrations of springs and fumaroles, and in the levels of ground deformation or swelling of the edifice. Activity at the summit may involve sluggish lava extrusion with resultant rockfall.

Magmatic intrusion to the surface is driving unrest, with indications that hazardous eruption could occur in weeks. Danger zones may be expanded to a radius of six (6) kilometers from the summit crater or active vent.

4

Hazardous Eruption Imminent

Intensifying unrest characterized by earthquake swarms and volcanic tremor, many of which may be perceptible.  Frequent strong ash explosions. Increasing rates of ground deformation and swelling of the edifice. Increasing rates of lava extrusion with increased frequency and volume of rockfall, or plugging of lava at the summit crater or active vent.

Low-level magmatic eruption underway, which can progress to highly hazardous major eruption. Danger zones may be expanded to a radius of ten (10) kilometers or more from the summit crater or active vent.

 

5

Hazardous Eruption in Progress

Magmatic eruption characterized by explosive production of tall ash-laden eruption columns, and/or descent and frequent failure of voluminous lava flows. Generation of deadly pyroclastic flows, surges and/or lateral blasts and widespread ashfall. Lahars generate along river channels.

Life-threatening major eruption producing volcanic hazards that endanger communities. Danger zones may be expanded to fourteen (14) kilometers as eruption progresses.

 

 

STAND-DOWN PROCEDURES

In order to minimize unnecessary changes in declaration of Alert Levels, the following periods shall be observed:

From Level 5 to Level 4: Wait at least 24 hours after hazardous activity stops

From Level 4 to Level 3 or 2: Wait at least 2 weeks after activity drops below Level 4

From Level 3 to Level 2: Wait 2 weeks after activity drops below Level 3

KANLAON VOLCANO OBSERVATORY

Bgy. Cubay, La Carlota City, Negros Occidental; Brgy. Pula, Canlaon City, Negros Oriental

Contact Nos: 09152854895

 Revised November 2015

 

PHILIPPINE STANDARD TIME