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'Storm may trigger lahar from Mayon'
By J.Lo
"Heavy rainfall may exacerbate risks in Mayon, and will force us to evacuate communities near lahar channels in addition to those already in danger zones," Albay Rep. Joey Salceda said with three to four tropical cyclones forecast to enter the country this month, feared heavy rain may trigger lahar flow around Mayon Volcano.
He said average rainfall in Albay in July is at 155.2 millimeters compared to 112.53 mm in rest of the year.
"Around 38 percent more rain, and if PAGASA projection takes place, we could see more… compounds risks Mayon poses," Salceda said.
He said there may be no need to evacuate residents near lahar channels if they are outside six to eight-kilometer danger zones.
"What we are looking at is extended evacuation for those in danger zones and intermittent evacuation for those in lahar channels during heavy rain…we will really need help," Salceda said.
He said lahar deposited on slopes of Mayon during 2018 eruption cascaded in 2020 due to rains spawned by Typhoon Rolly.
Philippine Institute of Volcanology and Seismology (Phivolcs) said lava flow from Mayon reached 2,230 meters and 1,300 meters along Mi-isi and Bonga gullies, respectively, in the past 24 hours.
Phivolcs said seven dome-collapse pyroclastic density currents lasted for two to three minutes, 284 rockfall events, two volcanic earthquakes, plumes that rose up to 2,500 meters and sulfur dioxide emissions that averaged 595 tons were also recorded.
With Mayon's unrest expected to last for few months, Albay Public Safety and Emergency Management Office (APSEMO) said potential donors should coordinate with provincial government before handing out food and non-food items.
APSEMO officer-in-charge Eugene Escobar said donations should be in response to actual needs of evacuees to avoid flooding of similar relief goods.
Escobar said so-called "donor fatigue" should be avoided as it may result in shortage of food and non-food needs of evacuees.
He said donations continue to pour in for Mayon evacuees from government and private groups.
Meanwhile, in Taal Volcano, Phivolcs said two phreatic bursts were recorded in past 24 hours.
Bursts were relatively small in size and produced plumes rose 250 meters and 200 meters, respectively.
Phivolcs said phreatic bursts were steam and gas-driven and did not generate ashfall.
Nine volcanic earthquakes, including five tremors lasted for two minutes, were recorded.
Sulfur dioxide flux of 7,49 tons per day with plumes rose up to 2,400 meters were monitored.
Taal Volcano remains under Alert Level 1.
Phivolcs said this means steam-driven explosions, volcanic earthquakes, minor ashfall and lethal accumulations or expulsions of volcanic gas may occur.
Mayon Volcano in Albay has experienced 254 rockfall events within past 24 hours, according to Phivolcs.
Mayon Volcano exhibited very slow effusion of lava from summit crater. This resulted in continued formation of lava flows in Mi-isi (south) and Bonga (southeastern) gullies, as well as rockfall and pyroclastic density currents (PDCs) in these areas and Basud (eastern) gully.
Although number of rockfall events decreased slightly compared to previous day's count of 284, volcanic activity remains cause for concern.
Seventeen dome-collapse pyroclastic density currents (PDCs) and 65 weak volcanic earthquakes have been documented during monitoring period.
Phivolcs also detected significant emissions of sulfur dioxide (SO2), averaging 1,002 tonnes per day. These emissions were first observed on June 29, 2023 through satellite monitoring.
"Lava flows advanced to approximate lengths of 2,230 meters and 1,300 meters along Mi-isi and Bonga gullies, respectively, from summit crater while collapse debris deposited to 3,300 meters from crater," Phivolcs said.
Mayon Volcano remains at Alert Level 3, indicating high level of unrest. Phivolcs warns hazardous eruption could occur within weeks or even days due to presence of magma in the crater.
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