PHIVOLCS reported that unrest at Kanlaon continued during 27 August-3 September. There were 3-12 daily volcanic earthquakes recorded by the seismic network. Steam-and-gas emissions rose 100-500 m above the summit and drifted ENE, E, SW, and W on most days. Sulfur dioxide emissions declined during the week, averaging 4,585 (27 August), 4,418 (28 August), 3,189 (29 August), and 2,669 (31 August) 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.

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)