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Report on Kanlaon (Philippines) — 15 November-21 November 2023


Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 15 November-21 November 2023
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2023. Report on Kanlaon (Philippines) (Sennert, S, ed.). Weekly Volcanic Activity Report, 15 November-21 November 2023. Smithsonian Institution and US Geological Survey.

Weekly Report (15 November-21 November 2023)



10.412°N, 123.132°E; summit elev. 2435 m

All times are local (unless otherwise noted)

In a special notice for Kanlaon, PHIVOLCS stated that the seismic network detected 15 volcano-tectonic earthquakes during 0358-0500 on 22 November with local magnitudes of 1.4-4.2 and depths of 0-2 km beneath the N flank. Sulfur dioxide gas emissions from the summit crater were elevated since 1 May, averaging 570 tonnes/day (t/d); the most recent measurement was 1,017 t/d, recorded on 14 November. Ground deformation data from continuous GPS and electronic tilt data had been recording inflation at the volcano since March 2022, and inflation of the mid-SW flank since October. 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.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)