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


Kanlaon

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)

Kanlaon

Philippines

10.4096°N, 123.13°E; summit elev. 2422 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) 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)