Report on Mayon (Philippines) — 5 June-11 June 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 June-11 June 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Mayon (Philippines). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 June-11 June 2013. 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 during 5-10 June white to off-white steam plumes that drifted WSW, NW, WNW, NNE, and NE, and occasional bluish fumes, were observed at Mayon. Incandescence emanated from the crater during most evenings into early mornings; cloud cover prevented crater observations during 7-8 and 10-11 June. During 5-6 and 9-10 June the seismic network recorded one volcanic earthquake each period, and during 6-7 June one rockfall signal was detected. The Alert Level remained at 1; PHIVOLCS reminded the public 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.