Report on Kanlaon (Philippines) — 9 July-15 July 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
9 July-15 July 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, 9 July-15 July 2003. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
An emission from Canlaon on 10 July at 1735 sent an ash-and-steam cloud to a height of ~1 km above the summit. The cloud was visible from Canlaon City and drifted NW, SW, and NE, depositing ash in an area within a 4 km radius around the crater. Emissions also occurred on 11 July during 0620-0624 and 0658-0705 that rose to ~1.3 km above the crater and drifted SE. Canlaon remained at Alert Level 1, 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.