Report on Mayon (Philippines) — August 1979
Scientific Event Alert Network Bulletin, vol. 4, no. 8 (August 1979)
Managing Editor: David Squires.
Mayon (Philippines) Seismic activity and crater glow
Please cite this report as:
Global Volcanism Program, 1979. Report on Mayon (Philippines). In: Squires, D. (ed.), Scientific Event Alert Network Bulletin, 4:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197908-273030.
13.257°N, 123.685°E; summit elev. 2462 m
All times are local (unless otherwise noted)
Seismic activity and crater glow were observed at Mayon 14-28 July. The same type of activity preceded the 1978 eruption. COMVOL has established a close watch on the volcano and will monitor any changes.
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: G. Andal, COMVOL, Quezon City; J. Wolfe, Pan Asean Technical Services, Manila.