Report on Kanlaon (Philippines) — 23 April-29 April 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 23 April-29 April 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Kanlaon (Philippines). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 23 April-29 April 2008. Smithsonian Institution and US Geological Survey.
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
According to news articles, PHIVOLCS lowered the Alert Level for Kanlaon to 0 on 25 April. Seismic activity was at background levels during 5 March-25 April, with 0-3 earthquakes per day. Mt. Kanlaon Natural Park opened for mountaineering activities; however visitors were warned that the risk of entering the 4-km permanent danger zone remained high.
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.
Source: Sun Star News