The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported a continuing eruption at Kanlaon during 19-25 November. The seismic network recorded 3-23 daily volcanic earthquakes, and sulfur dioxide emissions ranged from 5,125 to 8,040 tonnes per day; weather clouds obscured views on 19 November. Moderate gas-and-steam emissions high as 300 m above the summit and drifted SW and WSW. There was one ash emission event on 21 November and two on 23 November, with each lasting 4-8 minutes long. According to the Tokyo VAAC the ash emissions rose as high as 2.7 km (9,000 ft) a.s.l. and drifted W and SW. The Alert Level remained at 2 (on a scale of 0-5) and PHIVOLCS reminded the public to remain outside of the 4-km-radius Permanent Danger Zone and warned pilots not to fly close to the volcano.

Geological Summary. Kanlaon volcano (also spelled Canlaon) forms the highest point on the Philippine island of Negros. The massive andesitic stratovolcano is covered with fissure-controlled pyroclastic cones and craters, many of which are filled by lakes. The largest debris avalanche known in the Philippines traveled 33 km SW from Kanlaon. The summit contains a 2-km-wide, elongated northern caldera with a crater lake and a smaller but higher active vent, Lugud crater, to the south. Eruptions recorded since 1866 have typically consisted of phreatic explosions of small-to-moderate size that produce minor local ashfall.

Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Tokyo Volcanic Ash Advisory Center (VAAC)