Report on Kanlaon (Philippines) — 4 June-10 June 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 4 June-10 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, 4 June-10 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)
According to a news article, an ash emission occurred from Canlaon on 8 June during 0645-0700. Small amounts of ash fell in Canlaon City, Barangay Masulog, and Barangay Linutangan. In addition, PHIVOLCS recorded several low-frequency volcanic earthquakes and short-duration harmonic tremor. Moderate steaming occurred, which was above normal levels. The Alert Level at Canlaon remained at 1 (on a scale of 0-5), with a 4-km-radius Permanent Danger Zone.
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 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.
Source: Sun Star News