Report on Kanlaon (Philippines) — May 1980
Scientific Event Alert Network Bulletin, vol. 5, no. 5 (May 1980)
Managing Editor: David Squires.
Kanlaon (Philippines) Earthquake swarm
Please cite this report as:
Global Volcanism Program, 1980. Report on Kanlaon (Philippines) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 5:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198005-272020
10.412°N, 123.132°E; summit elev. 2435 m
All times are local (unless otherwise noted)
COMVOL reported that an average of 60 earthquakes/day were recorded near Canlaon in mid-May, reaching a maximum of 160 on 17 May [but see 5:6]. COMVOL installed three additional seismic stations around the volcano and extended the danger zone from 4 to 10 km. A similar earthquake swarm preceded the 1978 eruption.
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.
Information Contacts: AFP.