The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing unrest at Kanlaon during 13-19 November. The seismic network recorded 3-13 daily volcanic earthquakes, and sulfur dioxide emissions ranged from 4,246 to 7,818 tonnes per day. Daily moderate-to-voluminous gas emissions with intermittent ash rose as high as 1 km above the summit and drifted several directions. During 15-17 and 19 November there were 4-6 daily ash emission events, each lasting as short as 2 minutes and as long as one hour and 43 minutes. 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)