Report on Mayon (Philippines) — 19 January-25 January 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 January-25 January 2011
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2011. Report on Mayon (Philippines). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 19 January-25 January 2011. Smithsonian Institution and US Geological Survey.
13.257°N, 123.685°E; summit elev. 2462 m
All times are local (unless otherwise noted)
PHIVOLCS reported that a deformation survey of Mayon conducted in November and December 2010 showed inflation since a survey in 2008. During 18-25 January, up to two daily volcanic earthquakes were detected by the seismic network. Although cloud cover often prevented observations of the summit area, white steam emissions from the crater and nighttime crater incandescence were occasionally observed. The Alert Level remained at 1 and the public was reminded not to enter the 6-km-radius Permanent Danger Zone (PDZ).
Geologic Background. Beautifully symmetrical Mayon, which rises above the Albay Gulf NW of Legazpi City, is the Philippines' most active volcano. The structurally simple edifice has steep upper slopes averaging 35-40 degrees that are capped by a small summit crater. Historical eruptions date back to 1616 and 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 devastated populated lowland areas. A violent eruption in 1814 killed more than 1,200 people and devastated several towns.