Report on Kanlaon (Philippines) — 21 June-27 June 2006
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 21 June-27 June 2006
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2006. Report on Kanlaon (Philippines). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 21 June-27 June 2006. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
Minor steam-and-ash emissions that were observed from Canlaon during 21-24 June reached a maximum height of 1.5 km above the summit (12,900 ft a.s.l.) and drifted NW and SW. Light ash fall was observed approximately 25 km SW in the municipality of La Castellana. The alert status remained at Level 1, which restricts activity within 4 km of the summit.
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.