Report on Kanlaon (Philippines) — 4 May-10 May 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
4 May-10 May 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Kanlaon (Philippines). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 4 May-10 May 2005. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
Contingency plans formulated earlier this year by local governments in consultation with PHIVOLCS in the event of a major eruption were misinterpreted in press reports indicating that evacuations were being recommended. The current level of activity does not require any evacuation or facility closures. Ongoing ash emissions are only a concern on the upper slopes of the volcano within 4 km of the summit crater. Regular mild ash-and-steam clouds rising less than 800 m above the crater did not cause ashfall in local communities during 3-10 May.
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.