PHIVOLCS issued a special notice for Kanlaon on 9 February, noting localized earthquake activity on the lower NW flank. There were 11 very shallow earthquakes, with local magnitudes of M 0.9-2.1, recorded by the seismic network between 2012 on 8 February and 0900 on 9 February. Ground deformation data from continuous GPS and tilt measurements indicated slight inflation of the middle and upper flanks of the volcano since mid-October 2021; EDM and electronic tilt data reflected short-term deflation on the SE flank since December 2021 and January 2022, respectively. The Alert Level remained at 1 (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)