Report on Mayon (Philippines) — 1 July-7 July 2009
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 1 July-7 July 2009
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2009. Report on Mayon (Philippines) (Sennert, S, ed.). Weekly Volcanic Activity Report, 1 July-7 July 2009. Smithsonian Institution and US Geological Survey.
13.257°N, 123.685°E; summit elev. 2462 m
All times are local (unless otherwise noted)
According to news articles, PHIVOLCS implemented increased monitoring of Mayon after a recent rise in seismicity. Incandescence in the crater and a slight increase in sulfur dioxide gas output over background levels were also noted. The Alert Level remained at 1 (on a scale of 0-5). The 7-km Extended Danger Zone (EDZ) on the SE flank and the 6-km Permanent Danger Zone (PDZ) in all other areas remained in effect.
Geological Summary. Symmetrical Mayon, which rises above the Albay Gulf NW of Legazpi City, is the most active volcano of the Philippines. The steep upper slopes are capped by a small summit crater. Recorded eruptions since 1616 CE range from Strombolian to basaltic Plinian, with cyclical activity beginning with basaltic eruptions, followed by longer term andesitic lava flows. Eruptions occur predominately from the central conduit and have also produced lava flows that travel far down the flanks. Pyroclastic flows and mudflows have commonly swept down many of the approximately 40 ravines that radiate from the summit and have often damaged populated lowland areas. A violent eruption in 1814 killed more than 1,200 people and devastated several towns.
Source: GMA News