Glowing lava flow, ‘uson,’ rockfall seen on Mayon Volcano on Day 21 of effusive eruption

Mayon Volcano in Albay, Philippines, has continued its effusive eruption for the 21st consecutive day as of Tuesday. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reports ongoing activity including incandescent lava flows, rockfall, and pyroclastic density currents – locally known as “uson.”

Ongoing Volcanic Activity

PHIVOLCS documented the activity with photos taken between 8:15 p.m. and 8:17 p.m. Tuesday, showing lava flows and “uson” descending the volcano’s slopes. A time-lapse video, captured between 8:01 p.m. and 8:08 p.m., further illustrates the eruption’s progression.

Specific Areas of Activity

Lava flows, pyroclastic density currents, and rockfalls have been specifically observed in the Mi-isi (south), Bonga (southeast), and Basud (east) Gullies. PHIVOLCS continues to closely monitor these areas.

Did You Know? PHIVOLCS utilizes electronic distance meters (EDM) to measure baselines along Mayon Volcano’s slopes, providing insight into ground deformation.

As of Tuesday morning, PHIVOLCS recorded 272 volcanic earthquakes, 155 rockfall events, and the presence of pyroclastic density currents. A crater glow, plumes, and ground deformation were also observed.

Alert Level and Safety Measures

PHIVOLCS maintains an Alert Level 3 for Mayon Volcano, meaning there is a relatively high level of unrest. The agency warns that entry into the 6-km Permanent Danger Zone is prohibited.

Expert Insight: Continuous monitoring of volcanic activity, including ground deformation and gas emissions, is crucial for understanding the potential for further escalation and informing public safety measures. The observed changes suggest ongoing subsurface processes are influencing the eruption.

The agency regularly monitors sulfur dioxide emissions, a key indicator of magma movement as it nears the surface.

Frequently Asked Questions

What are pyroclastic density currents?

Pyroclastic density currents, or “uson,” are fast-moving currents of hot gas and volcanic matter.

What does Alert Level 3 signify?

Alert Level 3 signifies that Mayon Volcano is exhibiting a relatively high level of unrest, and entry into the 6-km Permanent Danger Zone is prohibited.

How is ground deformation measured?

PHIVOLCS regularly measures baselines using electronic distance meters (EDM) along the slopes of Mayon Volcano to gain insight into ground deformation.

What factors might influence the future behavior of Mayon Volcano, and how could these changes impact the surrounding communities?