The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing eruptive activity at Kanlaon during 27 May-3 June. The seismic network recorded 5-38 daily volcanic earthquakes. Daily sulfur dioxide emissions ranged from 300 to 1,844 tonnes per day. Gas-and-steam emissions of variable densities generally rose 75-750 m above the crater rim, though they reached 1.2 km on 2 June, and drifted SE, NE, NW, and SW. During 1338-1407 on 2 June a grayish ash plume rose 1.2 km above the summit and drifted W. The Alert Level remained at 3 (on a scale of 0-5); the public was warned to stay 6 km away from the summit and pilots were warned 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)