Taal: The 'very small but dangerous volcano' – BBC News, Bbc.com

        

                                 Image copyright                 Getty Images                                                      

Taal is one of the Philippines’ most active volcanoes.

Over the past few days, it’s begun spewing lava, triggering earthquakes and emitting huge plumes of ash that have spread across the island of Luzon and beyond.

Scientists fear a bigger “hazardous eruption” is imminent.

Taal is tiny, as volcanoes go, but it has been deadly before. And according to Renato Solidum, the head of the Philippines’ Institute of Volcanology and Seismology (Philvolcs), it is “very small but a dangerous volcano”.

So what is it about Taal that has got people so worried?

It’s a ‘complex’ volcano

Taal is defined as a “complex volcano” – it does not have just one main vent or cone but several eruption points that have changed over time.

            

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“Taal volcano is a baby volcano sitting within a much bigger caldera volcano, said Ben Kennedy, associate professor of physical volcanology at the University of Canterbury in New Zealand.

These new eruptions are taking place on Volcano Island, which sits inside Lake Taal, a sq km lake formed in the caldera of an earlier massive eruption.

Volcano Island alone has 90 craters and 4 maars – volcanic craters that form when hot magma comes into contact with shallow ground water, producing a violent steam explosion. Other vents and eruption points are underneath Lake Taal.

The entire Volcano Island has been marked as a permanent danger zone by Phivolcs.

It’s unpredictable

At least eruptions have been reported within the last few hundred years – the most recent was in (****************************.

A “very violent” eruption in 2019 from the main crater caused rock particles and fragments to shoot out of the volcano, according to news outlet Rappler. That event killed more than 1, people.

US-based volcanologist Jess Phoenix says Taal has “a history of multiple eruption styles”, so it creates threats on the ground in the form of lava and in the air through ash.

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There’s also the risk of a “volcanic tsunami”, she adds, which can be trigged by falling debris after an eruption generating waves in the lake.

“Any of these types of threats would be a major hazard for people nearby, “says Ms Phoenix.

The lake is also “potentially dangerous”, as water could interact with the magma, making it “more explosive”, said Mr Kennedy.

“If water gets to the exploding lava surface it flashes to steam and rapidly solidifies the lava it interacts with, making a very fine ash that explodes higher into the atmosphere and can travel further, “he told the BBC.

It’s close to lots of people

One of the main reasons people are worried is Taal’s proximity to millions of people.

                                                                                                                      

“Metro Manila is a few tens of kilometers away with a population of over

************************************** (million, and there are multiple cities within km that have more than 212, 10 People in each, not counting the smaller towns in between, “James White, head of geology at the University of Otago, told the BBC.

The UN Office for the Co-ordination of Humanitarian Affairs (OCHA) says that more than (**************************************, ************************************************ (people are estimated to live within the newly designated km danger zone.

Thousands have already been evacuated but many remain behind.

Despite the danger posed by volcanoes, many choose to live near them due for various reasons – one of them being the fertile volcanic soil that can be found in these parts.

What’s the situation like now?

On Tuesday, Phivolcs said Taal had generated “549 meter tall lava fountains, topped by dark gray steam-laden plumes reaching approximately 2km tall that dispersed ash “.

“The plume being 2km tall is actually small. A

m tall lava fountain is substantial, but it may not be super vigorous or strong, “Ms Phoenix told BBC News.

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Mr White, however, described a**************************** m tall fountain as a “very strong fountain”, adding that there would be “a lot of magma being erupted. “

Heavy ash also continues to fall on nearby municipalities and a total of

******************************** (volcanic earthquakes have taken place so far.)

“The seismic activity seems to indicate that there is more magma under the volcano and the eruption may continue,” said Mr Kennedy. “However volcanoes can just as easily quiet down as become more explosive.”

Earthquakes and volcanic activity are not uncommon in the Philippines , which lies along the Ring of Fire – a zone of major seismic activity, which has one of the world’s most active fault lines.

            

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