Report on Mayon (Philippines) — August 1980
Scientific Event Alert Network Bulletin, vol. 5, no. 8 (August 1980)
Managing Editor: David Squires.
Mayon (Philippines) Harmonic tremor
Please cite this report as:
Global Volcanism Program, 1980. Report on Mayon (Philippines) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 5:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198008-273030.
13.257°N, 123.685°E; summit elev. 2462 m
All times are local (unless otherwise noted)
Short-duration harmonic tremor began to be recorded at Mayon on 16 August. Bursts of tremor continued, but have become less frequent since the 16th. Similar seismicity preceded the 1978 eruption and accompanied crater glow in July 1979.
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.
Information Contacts: O. Peña, COMVOL, Quezon City.