Report on Kanlaon (Philippines) — 9 February-15 February 2022
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
9 February-15 February 2022
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2022. Report on Kanlaon (Philippines). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 9 February-15 February 2022. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
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), the most active of the central Philippines, forms the highest point on the island of Negros. The massive andesitic stratovolcano is dotted 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, historically active vent, Lugud crater, to the south. Historical eruptions, recorded since 1866, have typically consisted of phreatic explosions of small-to-moderate size that produce minor ashfalls near the volcano.