Report on Mayon (Philippines) — 6 December-12 December 2006
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 6 December-12 December 2006
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2006. Report on Mayon (Philippines). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 6 December-12 December 2006. 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, the National Disaster Coordinating Council in Manila estimated that 100,000 people still remained in shelters from typhoon Durian that struck on 30 November and triggered lahars down Mayon's flanks. An estimated 1,200 people are dead or missing. Media sources on 9 December reported that approximately 15,000 people from 12 villages were evacuated from areas around Mayon (in Albay province) in anticipation of more lahars following another typhoon. On 11 December, reports indicated that the second typhoon, Utor, had passed Albay without triggering lahars.
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.