Rockfall recorded at Mayon Volcano; Alert Level 1 stays

State volcanologists on Wednesday reported a rockfall event at Mayon Volcano after lava fragments detached from its summit crater, even as Alert Level 1 remains in effect.

The Philippine Institute of Volcanology and Seismology (Phivolcs) said the rockfall occurred at 9:29 a.m. on December 17, as detected by the seismic and visual monitoring instruments of the Mayon Volcano Network.

The event was caused by the detachment, or “spalling,” of lava from the summit crater, it said.

According to Phivolcs, the rockfall traveled along the Mi-isi Gully on the south-southeast portion of the volcano’s upper slopes and came to rest within one kilometer of the summit.

Phivolcs reiterated that Alert Level 1, which indicates low-level unrest, continues to prevail over Mayon.

Under this alert level, entry into the six-kilometer Permanent Danger Zone (PDZ) is strictly prohibited due to the risk of sudden hazardous events such as rockfalls, avalanches, and minor explosions.

The agency also advised against flying aircraft near the volcano.

The latest development follows Phivolcs’ report last week that spines of dark lava were observed emerging from Mayon’s summit lava dome.

The agency said the lava spines indicate the presence of new, shallow magma within the volcanic edifice, a condition that could lead to increased surface activity.

Phivolcs said it continues to closely monitor Mayon Volcano and will issue further advisories should there be significant changes in its activity.

Residents and local government units were again urged to remain vigilant and comply with all safety recommendations.—MCG, GMA Integrated News