Report on Kanlaon (Philippines) — 20 April-26 April 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 April-26 April 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, 20 April-26 April 2005. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
Mild ash eruptions continued at Canlaon during 21-26 April, producing plumes as high as 1 km above the volcano (11,300 ft a.s.l.). Emissions on 21 April drifted SW and deposited small amounts of ash in the villages of Sagang, Mansalanao, Old Fabrica, Biak-na-Bato, Kamandag, Tinago, and Cabagnaan of the town La Castillana. Emissions on 22 April deposited ash in Manghanoy and Cabagnaan. Emissions on 25 April deposited traces of ash in Canlaon City. Canlaon remained at Alert Level 1 (on a scale of 0-5).
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 2435-m-high 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 to the SW from Kanlaon. The summit of Kanlaon 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 from Kanlaon, recorded since 1866, have typically consisted of phreatic explosions of small-to-moderate size that produce minor ashfalls near the volcano.