Report on Mayon (Philippines) — 26 January-1 February 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
26 January-1 February 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, 26 January-1 February 2011. Smithsonian Institution and US Geological Survey.
13.257°N, 123.685°E; summit elev. 2462 m
All times are local (unless otherwise noted)
During 25-27 January, PHIVOLCS reported that one volcanic earthquake at Mayon was detected each day by the seismic network. Although cloud cover mostly prevented observation during 25-31 January, emissions of white steam were occasionally observed during cloud breaks. Incandescence from the crater was seen at night during 30-31 January. The Alert Level remained at 1 and the public was reminded not to enter the 6-km-radius Permanent Danger Zone (PDZ).
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: Philippine Institute of Volcanology and Seismology (PHIVOLCS)