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'Magma rising to Mayon's crater'
By J.Lo
"Our instruments continued to record Mayon's seismic activity, although we could not observe it visually because of thick clouds," Philippine Institute of Volcanology and Seismology (Phivolcs) resident volcanologist at Lignon Hill Observatory Paul Alanis said prolonged lava flow is anticipated in Mayon Volcano as fresh magma is continuously ascending to summit crater, causing "very high" sulfur dioxide emissions reached 6,703 tons, state volcanologists said over weekend.
Phivolcs said emissions were accompanied by 993 rockfall events, 53 volcanic earthquakes and 15 pyroclastic density currents (PDCs) in past three days.
Phivolcs said sustained high values in volcano's abnormal parameters indicated magma is continuously rising to surface.
Rising magma inflated northwest and southwest portions of Mayon.
Alanis said thick clouds prevented Phivolcs team from conducting visual observation of Mayon in past three days.
In the past 24 hours, Phivolcs recorded sulfur dioxide emissions of 2,989 tons, 270 rockfall events, nine volcanic quakes and three PDCs.
On Friday and Saturday, Phivolcs recorded 2,132 and 1,582 tons of sulfur dioxide emissions, 362 and 361 rockfall events, 39 and five volcanic earthquakes, and five and seven PDCs, respectively.
Alanis said figures could still fluctuate and high abnormal parameters indicate Mayon remains in high level of unrest.
Phivolcs said slow lava effusion continued in past 24 hours, with lava flows stretching to 2,800 and 1,400 meters along Mi-isi Gully in Daraga and Bonga Gully in Legazpi City, respectively.
Meanwhile, Albay Gov. Edcel Greco Lagman said there was still no reason to expand volcano's six-kilometer permanent danger zone amid possible threat of lahar flow.
Lagman said rains in the province have stopped.
"Rain has stopped in the past two to three days and there was hardly any rain felt on Saturday, although we still maintain alert status," Lagman said.
Earlier, Phivolcs warned heavy downpour over Mayon could trigger lahar flows.
Lagman said at least 5,788 families in 25 barangays located within six-kilometer permanent danger zone have been evacuated.
"This may increase to 7,323 families if we experience complex calamity or typhoon as well as present abnormal activity of Mayon," he said.
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