The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing unrest at Kanlaon during 6-12 November. Daily moderate-to-voluminous gas emissions with intermittent ash rose as high as 1 km above the summit and drifted several directions. Between 0546 and 0702 on 9 November an “ashing” event generated light gray plumes that rose 750 m above the summit and drifted SW. Trace ashfall was reported in Barangay Yubo (6.5 km WSW), La Carlota City (14 km W), Barangay Sag-ang (10 km SW), and La Castellana (16 km SW); the smell of sulfur was also reported in Yubo and Sag-ang. Microscopic examination of ash samples from events on 19 October, 2 November, and 5 November revealed that the ash is primarily old material and not from new magma. The seismic network recorded daily volcanic earthquakes, and sulfur dioxide emissions ranged from 2,125 to 7,378 tonnes per day. 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)