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The Philippine Institute of Volcanology and Seismology (PHIVOLCS) raised the alert level of Mayon Volcano from Level 1 to Level 2 on Friday afternoon, advising residents to keep at a distance of six kilometers from the volcano.
There are six alert levels for Mayon Volcano: 0 (no alert), 1 (abnormal), 2 (alarming), 3 (critical), 4 (hazardous eruption imminent), and 5 (hazardous eruption).
Level 2 is characterized, according to PHIVOLCS, by “moderate unrest,” “low to moderate levels of seismic activity,” and “episodes of harmonic tremor,” among others.
It “could eventually lead to eruption,” with PHIVOLCS reminding residents to “be vigilant and desist from entering the 6-kilometer-radius Permanent Danger Zone.”
It said the agency would continue to monitor the volcano closely and would keep the public updated about any developments.
According to PHIVOLCS, these are the signs that a volcano is about to erupt, although these may vary from volcano to volcano.
1. Increase in the frequency of volcanic quakes with rumbling sounds; occurrence of volcanic tremors,
2. Increased steaming activity; change in color of steam emission from white to gray due to entrained ash,
3. Crater glow due to presence of magma at or near the crater,
4. Ground swells (or inflation), ground tilt, and ground fissuring due to magma intrusion,
5. Localized landslides, rockfalls, and landslides from the summit area not attributable to heavy rains,
6. Noticeable increase in the extent of drying up of vegetation around the volcano’s upper slopes,
7. Increase in the temperature of hot springs, wells (e.g. Bulusan and Canlaon) and crater lake (e.g. Taal) near the volcano,
8. Noticeable variation in the chemical content of springs, crater lakes within the vicinity of the volcano,
9. Drying up of springs/wells around the volcano,
10. Development of new thermal areas and/or reactivation of old ones; appearance of solfataras (“a natural volcanic steam vent,” according to Encyclopaedia Britannica).
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