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Report on Kanlaon (Philippines) — 19 January-25 January 2022


Kanlaon

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
19 January-25 January 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, 19 January-25 January 2022. Smithsonian Institution and US Geological Survey.

Weekly Report (19 January-25 January 2022)

Kanlaon

Philippines

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 21 January, noting that a total of 18 volcanic earthquakes were recorded in the past day. Four of those events were classified as shallow “tornillo” signals indicating gas movement along shallow fractures in the upper part of the volcano. Ground deformation data from continuous GPS and tilt measurements indicated slight inflation of the volcano since mid-October 2021. The seismic activity and ground deformation was likely caused by shallow hydrothermal processes and could generate phreatic events. 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)