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Home News Top Stories

Mt. Pinatubo alert raised amid low-level unrest

Rio N. ArajabyRio N. Araja
March 5, 2021, 1:30 am
in Top Stories
Reading Time: 3 mins read
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The Philippine Institute of Volcanology and Seismology on Thursday raised the status of Mt. Pinatubo in Zambales from alert level 0 – its highest level since January 1996 – to alert level 1.

Philvolcs raised alert level 1 on Mt. Pinatubo on Thursday, March 4, 2021 owing to low-level unrest. Volcanologists recorded 1, 722 ‘imperceptible earthquakes’ since Jan. 20, 2021. File photo shows Mt. Pinatubo’s volcanic mushroom cloud exploding high. AFP  

“This means that there is low level unrest that may be related to tectonic processes beneath the volcano and that no imminent eruption is foreseen,” its volcano bulletin read.

Phivolcs, however, said entry into the Pinatubo crater area must be conducted with extreme caution and should be avoided if possible.

“Communities and local government units surrounding Pinatubo are reminded to be always prepared for both earthquake and volcanic hazards and to review, prepare and strengthen their contingency, emergency and other disaster preparedness plans,” it cautioned.

Since Jan. 20, the Pinatubo Volcano Network has detected 1,722 imperceptible earthquakes beneath the Pinatubo edifice.

Phivolcs said the 1,722 imperceptible earthquakes ranged from magnitudes 0.5 to 2.8, beneath the Pinatubo edifice. The daily volcanic quake average in alert level 0 is below five.

Imperceptible earthquakes are volcanic seismic activities that are not felt, according to Solidum.

Phivolcs’ Pinatubo volcano bulletin issued on Thursday said all earthquakes recorded are associated with rock-fracturing processes.

“Measurements at Pinatubo Crater lake in February 2021 yielded a total CO2 flux of 378 tonnes/day which is still within the background range of 1,000 tonnes/day recorded in the past decade,” it added.

Slight increases in the temperatures of monitored fumaroles or gas vents were recorded but other characteristics such as acidity (pH) remain unchanged, Phivolcs also mentioned in the bulletin.

Solidum said that while Mt. Pinatubo would not erupt soon, residents must take precautions as this data only shows there is volcanic activity.

“Take extra caution when entering the Pinatubo crater, and one should only go there when necessary,” he said.

He also pointed out that while it may take many years before Mt. Pinatubo could erupt again, the public must not be complacent.

Phivolcs continuously monitors its volcanic activity, including other factors like a strong earthquake that could strike near Mt. Pinatubo, as this could affect the volcano.

“We will see whether we need to raise or lower the alert status of the volcano,” he said.

Meantime, Phivolcs Director Renato Solidum Jr. has urged the local government in the area to review their disaster risk reduction and management plans.

As of Thursday, other active volcanoes — Taal, Mayon, and Kanlaon — are still under alert level 1.

Solidum reiterated that residents near those volcanoes must not enter the Permanent Danger Zones.

Mt. Pinatubo’s last eruption was on June 15, 1991, and back then it was described as the world’s largest volcanic eruption to happen in the past 100 years.

The volcano emitted bursts of gas-charged magma into umbrella ash clouds. Hot flows of gas and ash descended the volcano and lahar swept down the valleys.

For centuries, it had been quiet prior to its 1991 eruption.

Solidum said in April of that year, the volcano showed early signs of activity.

“’In 1991, everything went so fast. There was a phreatic eruption in April and then the volcano erupted in June, it was only a few months,” he said.

Tags: Mt. PinatuboPermanent Danger ZonesPhilippine Institute of Volcanology and SeismologyRenato Solidum Jr
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Rio N. Araja

Rio N. Araja

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