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Philippines warns Mayon volcano may erupt soon

Philippines authorities warned that Mayon, one of the country's most active volcanoes, is showing signs of life and could erupt again soon.

The Philippine Institute of Volcanology and Seismology The Philippine Institute of Volcanology and Seismology (Filipino: Suriang Pilipino ng Bulkanolohiya at Sesmolohiya, abbreviated as PHILVOLCS) is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes and  said it is raising the 2,460-metre (8,070-foot) mountain's alert status to "moderate unrest" from that of "low-level unrest."

Nearby residents were reminded not to venture into a "permanent danger zone" in a six-kilometre (nearly four mile) radius from the crater crater, circular, bowl-shaped depression on the earth's surface. (For a discussion of lunar craters, see moon.) Simple craters are bowl-shaped with a raised outer rim. Complex craters have a raised central peak surrounded by a trough and a fractured rim. .

The zone was also extended to seven kilometres on its southeast flank flank (flank) the side of the body between ribs and ilium.

1. The side of the body between the pelvis or hip and the last rib; the side.

, which faces Legazpi, a city of 160,000 people.

"This alert condition signifies a state of unrest which could lead to ash explosions or eventually to hazardous magmatic eruption eruption /erup·tion/ (e-rup´shun)
1. the act of breaking out, appearing, or becoming visible, as eruption of the teeth.

," the institute said in its latest advisory.

The increased frequency of low-level volcanic quakes had pushed toward the crater lip "a cone-shaped pile of hot, steaming old rocks, possibly remnants from previous eruptions which could be the source of the glow at the crater," it added.

Seismologist seis·mol·o·gy  
The geophysical science of earthquakes and the mechanical properties of the earth.

 Renato Solidum, the head of the government institute, said the immediate danger if volcanic activity escalates was of ash explosions that could affect aviation at Legazpi airport Legazpi Airport (IATA: LGP, ICAO: RPLP) in the Philippines is a major airport in the Bicol Region, serving the vicinity of Legazpi City in Albay. With a runway of 2280 x 36 meters, longer than those of Bacolod City Domestic Airport (1958 x 30 meters) or former  or crush roofs of nearby houses.

"Sudden explosions and rockfalls from the upper slopes" are also a threat, the advisory said.

Mayon has erupted 48 times since records began, most recently in 2006. A major eruption in 1814 buried the town of Cagsawa.
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Publication:AFP Global Edition
Date:Jul 10, 2009
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Philippines warns Mayon volcano may erupt soon

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