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Report on Mayon (Philippines) — 13 October-19 October 2004


Mayon

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
13 October-19 October 2004
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2004. Report on Mayon (Philippines). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 13 October-19 October 2004. Smithsonian Institution and US Geological Survey.

Weekly Report (13 October-19 October 2004)

Mayon

Philippines

13.257°N, 123.685°E; summit elev. 2462 m

All times are local (unless otherwise noted)


According to a news report, seismicity increased at Mayon during 18-19 October. Based on information from PHIVOLCS, the article reported that seven low-frequency earthquakes and harmonic tremor were recorded in a 24-hour period.

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: ABS-CBN News