In a special notice for Kanlaon, PHIVOLCS stated that the seismic network detected 24 volcano-tectonic earthquakes during 1335-1630 on 26 May with local magnitudes of 0.8-2.3 and depths of 0-6 km beneath the W flank. Sulfur dioxide gas emissions from the summit crater had been elevated since 1 January, averaging 1,291 tonnes/day (t/d); the most recent measurement was 2,003 t/d, recorded on 26 May. Ground deformation data from continuous GPS and electronic tilt data had been recording inflation at the volcano since March 2022. 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)