NextGen Day

MANILA, Philippines — Following its eruption on Sunday, the Civil Aviation Authority of the Philippines (CAAP) and the Philippine Institute of Volcanology and Seismology (Phivolcs) both warned the public to avoid the Bulusan Volcano in Sorsogon.

Pilots should avoid flying near the volcano and should fly at least 10,000 feet above it, according to CAAP.

“The distance between the ground and the airspace should be 10,000 feet. This only applies to the Bulusan Volcano’s radius, not the entire Bicol Region “According to CAAP spokesperson Eric Apolonio.

CAAP based its message to airmen (NOTAM) on the alert level raised by the Phivolcs over the Bulusan Volcano, he claimed.

Since Sunday, Mount Bulusan has been on Alert Level 1 (low-level unrest), when it blew a thick plume past 10:30 a.m., triggering ash falls in various Sorsogon localities.

“The NOTAM (advice to pilots to fly the aircraft) was sent yesterday at 18,000 feet above the surface. Because the eruption intensity has also diminished, the safety standard for airplanes flying near the volcano has been lowered to 10,000 feet from the surface “he stated

Phivolcs Director Renato Solidum, Jr. stated in a public briefing on Monday that staying away from the volcano’s proximity is vital since distance will protect people if the volcano erupts.

He claims that Phivolcs has defined the permanent danger zone, ensuring that the people are not harmed in the event of a phreatic eruption because they are far enough away from the volcano.

People would also be able to flee if volcanic activity became more intense.

Phivolcs, like the CAAP, have recommended that flying any aircraft near the Bulusan Volcano be prohibited.

A similar phreatic eruption at the Bulusan Volcano, according to Solidum, is still feasible. He predicted that this would happen days, weeks, or months after the first eruption, based on previous eruptions.

“As a result, the public should follow the PDZ prohibitions,” he stated.

“Because pyroclastic eruptions might occur rapidly,” Solidum continued, “the public should closely adhere to the no-entry recommendation on the 4-kilometer radius permanent danger zone (PDZ) and exercise caution in the 2-kilometer extended danger zone in the southeast sector.”

The warning signs of a phreatic eruption, he noted, are subtle and “may not be obvious enough to provide enough lead time.”

This is in contrast to a magmatic eruption, in which a large amount of magma is rising and may display various symptoms before erupting.

Solidum explained that because phreatic eruptions are caused by shallow hydrothermal activity, determining the signals before a phreatic eruption is a typical difficulty for the volcanological community around the world.

Active volcanoes in the Philippines can produce both phreatic and magmatic eruptions, according to him.

Volcanic earthquakes, ground or surface deformation, and volcanic gases or water chemistry are all common precursors for volcano monitoring, according to him.

Meanwhile, CAAP stated in a press statement that no ash-related damage has been reported at any of the Bicol Region’s seven airports.

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