Canlaon, Philippines

Location: 10.4N, 123.1E
Elevation: 7,987 feet (2,435 m)
Last Updated: March 29, 2004


Space Shuttle photo STS056-0155-0219. April 15, 1993.

Canlaon is a stratovolcano in the north central part of the island of Negros. It has two summit cones, each with a crater. This photo looks west across northern Negros. Silay, a Holocene stratovolcano is the northern most cone on the island (obscured by clouds). Mandalagan, also a Holocene stratovolcano, has a small plume on clouds off its summit to the southeast (to the bottom left). Canlaon is near the center of the north part of the island.

Canlaon has 19 historic eruptions between 1866 and 1993. The eruptions are small to moderate in size (VEI=1-2) and explosive.


March 9, 2004

Low seismic and volcanic activites were observed since September 2003. As a result, PHIVOLCS reduced the Alert Level to 0 on March 1. A warning was however release which states that sudden phreatic explosions may occur within a radius of 4 km.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report

July 15, 2003

Emissions from Canlaon on July 10 and 11 sent ash-and-steam clouds to a height of ~1 km above the summit. Canlaon remained at Alert Level 1, with a 4-km-radius Permanent Danger Zone.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


July 8, 2003

As of 4 July, moderate steam-and-ash emissions continued at Canlaon, with ash columns reaching ~900 m above the summit. Based on Canlaon's historical behavior the current mild phreatic activity is probably related to shallow hydrothermal disturbances. The absence of longer duration harmonic tremors suggested no active magma movement or intrusion. However, sudden ash emissions and explosions are still expected to occur anytime without warning. Canlaon remained at Alert Level 1 (on a scale of 0-5).

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


June 24, 2003

On the 17th and 18th, multiple ash-and-steam plumes rose to a maximum height of ~400 m. Low-frequency volcanic earthquakes were recorded prior to the eruptions. Canlaon remained at Alert Level 1 (on a scale of 0-5), with a 4-km-radius Permanent Danger Zone.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


June 10, 2003

Moderate steaming was observed and ash was emitted from Canlaon on June 8 and fell in Canlaon City, Barangay Masulog, and Barangay Linutangan. The Alert Level at Canlaon remained at 1 (on a scale of 0-5), with a 4-km-radius Permanent Danger Zone.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


December 3, 2002

On Nov. 28, a small ash puff that reached a height of ~100 m above Canlaon. Volcanic tremor was also recorded and moderate steam emissions were observed.

This information was summarized from the GVP/USGS Weekly Volcanic Activity Report


February 5, 2002

This week at Canlaon, earthquakes recorded are mainly high frequency type from depth of 1.0 to 5.5 km. Scientists at Philvolcs believes fluid, and possibly magma, is ascending. Canlaon remains at Alert Level 1, but the scientists consider raising it.

This information was summarized from http://www.sunstar.com.ph/news/news_article_affiliate.php3?id=13300





April 5, 2001

PHIVOLCS has reported that since January 2001, earthquake clusters or occurrences have been recorded by the seismic monitoring network around the Canlaon volcano. The earthquakes may indicated a reactivation of the volcano and could be a precursor to more vigorous activity. PHIVOLCS has recommended the immediate suspension of all treks to the summit crater until further notice. A pre-defined 4-km-radius Permanent Danger Zone should be avoided at all times.

This information was summarized form the Global Volcanism Program's Preliminary Notices of Volcanic Activity.


Sources of Information:

Neumann van Padang, M., 1953, Philippine Islands and Cochin China. Catalogue of the Active Volcanoes of the World, International Association of Volcanology, 2, Rome, Italy, 49 p.

Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.



Images of Volcanoes To VolcanoWorld