Report on Kanlaon (Philippines) — 27 November-3 December 2002
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 27 November-3 December 2002
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2002. Report on Kanlaon (Philippines). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 27 November-3 December 2002. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
A small ash puff was released from Canlaon on 28 November at 0721. The puff rose to a height of ~100 m above the active crater and drifted SW. Associated volcanic tremor was recorded at Cabagnaan and Guintubdan stations. Traces of ash fell at Cabagnaan station, SSW of the active crater. Moderate steam emissions were observed immediately after the ash puff and a few discrete tremors were recorded. PHIVOLCS advised the public to remain outside of the 4-km-radius Permanent Danger Zone.
Geologic Background. 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.