The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing unrest at Kanlaon during 22-29 October. The seismic network recorded 1-6 daily volcanic earthquakes. The summit was obscured by weather conditions daily. Sulfur dioxide emissions continued to be high, averaging 4,853-5,188 tonnes/day (t/d) during 26-27 October. A special notice issued on 28 October noted that summit emissions of sulfur dioxide measured with a Flyspec instrument averaged 10,074 tonnes/day (t/d), the fifth highest ever recorded at the volcano. Sulfur odors were reported in Masulog and Canlaon City (8 km ESE) proper and, to a lesser degree, in the neighborhoods of Panubigan and Binalbagan, Canlaon City. 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.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)