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Yesterday evening at 7:04 PM, Kanlaon Volcano on Negros Island erupted suddenly. Over two minutes, it shot a 2,500-meter ash plume skyward with rumbling booms, lightning, and chest-thumping sounds, turning a quiet night into a dramatic event felt miles away.
(Photo: DOST-PHILVOLCS)
In volcanology, duration is often a deceptive metric for danger. While the primary explosive phase on February 26 lasted only two minutes, the geological output was remarkably dense. PHIVOLCS surveillance footage confirmed a moderately explosive eruption that behaved with the violence of a much larger event.
During that brief window, the volcano ejected incandescent ballistics (essentially glowing rocks) that rained down near the crater. It also generated pyroclastic density currents (PDCs), which are ground-hugging, high-velocity clouds of hot gas and debris. These flows surged within 2 km of the summit on the eastern slopes, proving that lethal conditions can manifest in less time than it takes to brew a cup of coffee (Ironically, many residents were doing just that. They were brewing coffee to keep vigil as the disaster unfolded).
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A common misconception is that volcanic ash is soft or flaky like burnt wood. In reality, the fallout hitting Negros Occidental right now is composed of tiny, jagged particles of pulverized rock and glass. Because these particles are dense and non-absorbent, they don't just settle; they accumulate with a heavy, crushing weight.
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Heavy ash from Kanlaon Volcano's eruption has coated nearby areas like wet cement, weighing down roofs and risking collapses while burying crops and disrupting farming. A sharp sulfuric smell, like rotten eggs, has spread southwest into towns including Pontevedra, Himamaylan, and San Carlos City, causing eye and throat irritation even 10-20 km away.
For thousands of residents in Negros Occidental, clearing driveways, streets, and homes demands N95 masks or better, gloves, and shovels to handle the grueling task safely. Authorities warn against sweeping dry ash, which can release harmful fine particles leading to respiratory problems or water contamination. Instead, hose down accumulations first and shelter during any ongoing fallout.
One of the most startling aspects of this eruption was its physical reach, extending far beyond the 4-km Permanent Danger Zone (PDZ). While the ash traveled on the wind, the eruption’s energy traveled through the air as infrasound—low-frequency sound waves below the range of human hearing that still possess enough physical energy to move objects.
During the February 26, 2026, eruption of Kanlaon Volcano, powerful shockwaves rippled outward from the summit, rattling windows and shaking homes in communities roughly 10 km away. PHIVOLCS detected these infrasound waves at stations over 30 km distant, registering as deep, chest-thumping booms that underscored the event's intensity.
This phenomenon reveals a vital aspect of volcanic hazards for disaster preparedness. While tangible threats like pyroclastic flows, lava, and ashfall remain confined to the 4-km permanent danger zone (PDZ), the invisible atmospheric pressure waves propagate widely, unsettling distant neighborhoods and amplifying psychological stress across Negros Island. Residents described the sudden jolts turning a quiet evening into a moment of alarm, prompting families to check structures and heed evacuation alerts even outside high-risk areas.
This latest event has brought eruption fatigue back to the forefront of the local conversation. For Negros, this wasn't an isolated incident. It followed a similar eruption on February 19 and is part of a relentless cycle of unrest dating back to 2024.
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The human cost is evident in data from the Negros Occidental Operations Center, which noted that at least 248 people had been moved to evacuation centers during this period. Viral clips show residents cleaning ash in dim light—a scene that has become an all-too-frequent ritual. There is a palpable tension between the resilience of the Negrense people and the frustration of living with a restless neighbor that repeatedly forces families to choose between their livelihoods and their safety. 
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As of today, Kanlaon remains under Alert Level 2. The 4-km Permanent Danger Zone remains strictly off-limits as scientists monitor continuous ash emissions and reassess the volcano’s parameters.
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The immediate explosive energy has dissipated, but the work for the residents of Negros Occidental and Oriental is just beginning. Recovering infrastructure and agriculture from cement-like fallout is a marathon. As communities continue to sweep roofs and replant fields, they face the recurring question of how to build a stable future on ground that refuses to stay still.
Keep safe everyone.