Report on Kanlaon (Philippines) — 6 April-12 April 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
6 April-12 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, 6 April-12 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)
A low-energy ash emission from Canlaon on 7 April at 1429 generated a cloud to a height of ~100 m above the crater (~8,300 ft a.s.l.). The cloud slowly drifted SW. Only the crater and upper SW slopes of the volcano were affected by the emission. According to PHIVOLCS, the seismic monitoring network around the volcano did not record any earthquakes during the event. Canlaon remained at Alert Level 1.
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.