Phivolcs: Another phreatic eruption recorded on Mayon Featured

Phivolcs: Another phreatic eruption recorded on Mayon Featured

This indicates pressurization of the edifice by rising magma or its perturbation of Mayon's subsurface hydrothermal system.

Phreatic eruption is a steam-driven explosion when water underground or surface water is heated by magma, hot rocks, lava or new volcanic deposits.

"Phreatic eruption at Mayon Volcano at 8:49 a.m., ashfall should be expected on the southwest and west slopes", the Philippine Institute for Volcanology and Seismology (PHIVOLCS) said on its Facebook page on Sunday. The Level 2 alert suggests that the current activity is "probably of magmatic origin, which could lead to more phreatic eruptions or eventually to hazardous magmatic eruptions".

Traces of ash fell on Barangays Anoling, Sua, Quirangay, Tumpa, Ilawod and Salugan of Camalig and in Barangays Tandarora, Maninila and Travesia in Guinobatan.

"The public is strongly advised to be vigilant and desist from entering the 6k-radius Permanent Danger Zone to minimise risks from sudden explosions, rockfall and landslides", Phivolcs said.

Phivolcs raised the alert on Mayon Volcano to level 2 on Saturday after the first phreatic eruption, which created an ash column with an approximate height of 2,500 metres.

Andanar also told the residents directly affected by the eruption to cooperate with the local governments to avoid injuries or casualties.

The bulletin advised residents to prepare for "ash fall events" as pilots were urged to avoid flying close to the summit of the volcano.

Albay Public Safety and Emergency Management Office head Cedric Daep announced the barangays in the towns of Daraga, Camalig, Guinobatan, Malilipot, Tabaco City, and Ligao City.

Its last eruption came in 2014 when thousands were forced to evacuate.

Prior to this phreatic eruption, Mayon's edifice has undergone inflationary changes or a slight swelling of the edifice as indicated by ground deformation data recorded by continuous Global Positioning System and tilt since October and November 2017, respectively.

The volcano's most destructive eruption took place in February 1841 when lava covered a nearby town and killed 1,200 people.

The volcano has been displaying abnormal behavior since late past year.

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