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The volcano in Bulusan is now at a routine warning level.

According to a report from the Philippine Institute of Volcanology and Seismology (Phivolcs), the Bulusan Volcano has returned to normal or Alert Level 0.

Phivolcs stated the observational parameters have returned to baseline or background levels in an advisory on Wednesday night.

Additionally, no magmatic eruption is anticipated in the near future, leading Phivolcs to reduce the volcano’s alert level.

Phivolcs has been logging 0–5 earthquakes at Bulusan Volcano per day since the first week of December.

Less than 10 kilometers beneath the structure, the majority of these earthquakes took place at a short depth.

The decline suggests that shallow hydrothermal activity within the volcano that is connected to rock-fracturing processes has decreased.

Since October 12, 2022, there have been 274 tonnes of sulfur dioxide emitted on average every day, with the greatest average emission being 462 tonnes on October 21 of last year.

The advisory stated that “volcanic gas inflow from the shallow hydrothermal system has largely maintained within baseline level.”

The majority of observed springs, it said, have been showing overall minor declines in temperatures, rises in acidity, and decreases in diffuse carbon dioxide, but none of these trends suggest input from deep magma sources.

Phivolcs also reported that from the second week of November, very weak to mild emission has been seen coming from the volcano’s active vents.

Entry into the four-kilometer permanent danger zone should be avoided, especially close to the vents on the south-southeastern slopes, even though the Bulusan Volcano is now back to normal. This is because there could be a sudden and dangerous steam-driven or phreatic eruption, rockfall, or landslide.

Pilots should avoid flying close to the volcano’s top because ash from any abrupt phreatic eruption can be dangerous to planes, aviation authorities are recommended to advise.

On the other side, during periods of intense and protracted rains, those who live in valleys and along the river/stream channels are cautioned to watch out for lahars and stream flows that are strewn with sediment.

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