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Mayon update: SO2 emission up, heavy rains bring lahar danger 14 October 2009

Posted by admin in activity reports, Mayon, natural hazards, Philippines.
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Mayon volcano in the Philippines has had a restless summer and early autumn, with elevated seismicity, increased sulphur dioxide emissions, incandescence at the summit crater and, on 15 September, three small ash explosions. The alert level for Mayon was raised by the Philippine Institute of Volcanology and Seismology (Phivolcs) to level 2, ‘moderate unrest’, on 10 July.

The latest reports are of a rise in sulphur dioxide emissions, up from 505 tonnes/day on 10 October to 853 tonnes/day on 11 October. Seven volcanic earthquakes were also detected, making for a moderate total of 43 quakes recorded during 5-11 October. Steaming activity and crater incandescence remained at low levels.

Meanwhile, heavy rains overnight on 13-14 October produced a lahar which descended Mayon’s slopes, causing alarm among people living around the volcano and blocking a major road into Legazpi City. The areas affected – Paddang, Darraga and Camalig, to the west of Legazpi – indicate that the lahar descended the southern or south-western flanks of the volcano. The authorities, concerned at the threat of future lahars as the heavy rains continue, have begun to carry out ‘selective evacuations’ of at-risk areas near the volcano.

For all our Mayon coverage: Mayon « The Volcanism Blog.

News
Mayon volcano’s sulfur dioxide emission rate increases – GMANews.TV, 12 October 2009
Heavy rains threaten Albay; selective evacuations ordered – ABS-CBN News, 14 October 2009
‘Lahar’ flows down MayonManila Times, 15 October 2009

Information
Global Volcanism Program: Mayon – summary information for Mayon (0703-03=)
Philippine Institute of Volcanology and Seismology – website for Phivolcs

The Volcanism Blog