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Report on Mayon (Philippines) — 21 March-27 March 2018


Mayon

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 21 March-27 March 2018
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2018. Report on Mayon (Philippines) (Sennert, S, ed.). Weekly Volcanic Activity Report, 21 March-27 March 2018. Smithsonian Institution and US Geological Survey.

Weekly Report (21 March-27 March 2018)

Mayon

Philippines

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

All times are local (unless otherwise noted)


PHIVOLCS reported that during 21-27 March activity at Mayon included periods of gravity-driven lava advancement, gas-and-steam emissions, rockfalls, and quiescence. Lava flows were about 3.3 km, 4.5 km, and 1.9 km long in the Mi-isi (S), Bonga (SE), and Basud (E) drainages, respectively. Steam-and-gas emissions drifted mainly SW. At 1039 and 2133 on 23 March pyroclastic flows traveled 4-5 km down the Mi-isi drainage, producing light brown ash clouds that drifted SW. The Alert Level remained at 3 (on a 0-5 scale) and PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone and the 7-km Extended Danger Zone on the SSW and ENE flanks.

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: Philippine Institute of Volcanology and Seismology (PHIVOLCS)