Report on Kanlaon (Philippines) — 18 June-24 June 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
18 June-24 June 2003
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2003. Report on Kanlaon (Philippines). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 18 June-24 June 2003. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
On 17 and 18 June multiple small emissions occurred at Canlaon. On the 17th and on the morning of the18th ash-and-steam plumes rose to a maximum height of ~400 m above the volcano and drifted NE. On the afternoon of the 18th plumes drifted SE. Low-frequency volcanic earthquakes were recorded prior to the eruptions. Canlaon remained at Alert Level 1 (on a scale of 0-5), with a 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.