The view from inside a volcano

Summary

Unexplainable Podcast Summary: "The View from Inside a Volcano"

Release Date: May 7, 2025
Host/Author: Vox
Episode Title: The View from Inside a Volcano

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Introduction

In this episode of Unexplainable, Vox delves deep into the enigmatic world of volcanoes, exploring the challenges scientists face in predicting eruptions and the innovative proposal to drill into a volcano's magma chamber. Hosted by Byrd Pinkerton, the episode features insights from renowned volcanologists and highlights the potential revolutionary impact of unprecedented direct observations of magma.

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Historical Context: Soufriere de Guadalupe in the 1970s

The episode begins with a recount of volcanic activity on the Caribbean island of Basseterre, particularly focusing on the Soufriere de Guadalupe volcano. Mike Poland, a volcanologist with the U.S. Geological Survey, provides a historical perspective on volcanic unrest in the 1970s.

• Mike Poland (Volcanologist 1) [01:06]: "A volcano called Soufriere. Actually, there's seems like most volcanoes in the Caribbean are named Soufriere, but this one is Soufriere de Guadalupe."

In the mid-1970s, Soufriere de Guadalupe exhibited alarming signs of potential eruption, including increased earthquake activity and steam explosions.

• Mike Poland [01:31]: "So you were seeing more and more earthquakes. They were getting up to like magnitude threes. They were being felt. And then there were these sort of steam explosions."

Historical eruptions in the Caribbean have been catastrophic, with the 1902 eruptions of Soufriere de Trinidad and Soufriere de Saint Vincent claiming tens of thousands of lives due to devastating ash flows.

• Mike Poland [01:47]: "There is a history of really bad eruptions in the Caribbean... that killed tens of thousands of people."

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The Dilemma of Evacuation

Faced with the signs of an impending eruption, authorities decided to evacuate over 70,000 residents from Basseterre. Filmmaker Werner Herzog documented this dramatic exodus in his documentary "La Soufriere," capturing the eerie quiet of an abandoned city.

• Filmmaker [03:05]: "During the flight, we got the impression that these were the last hours of this town and the last pictures ever taken of all."

However, the eventual eruption was minor, rendering the massive evacuation unnecessary and causing significant social and economic disruption.

• Mike Poland [04:29]: "Except the ensuing eruption was minor. If anything, the evacuation itself wound up being more of an issue than the volcano."

This incident underscores the delicate balance volcanologists must maintain between ensuring public safety and avoiding unnecessary panic.

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Challenges in Volcanology: Predicting Eruptions

Despite advancements in monitoring technology since the 1970s, predicting the magnitude and impact of volcanic eruptions remains a significant challenge.

• Mike Poland [05:25]: "Yeah, Pretty much now."

Volcanologists are adept at determining whether a volcano will erupt but struggle to forecast the specifics of the eruption itself.

• Mike Poland [05:57]: "Once an eruption starts, is it going to be one that lasts a long time? Will it get to be a big eruption? Will it be a kind of a piddly eruption? That's really hard to tell."

The primary hurdle lies in understanding the complex dynamics of magma chambers—the molten rock reservoirs beneath volcanoes.

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The Magma Observatory Proposal

To bridge this knowledge gap, a groundbreaking proposal has emerged: drilling directly into a volcano's magma chamber to establish a magma observatory. This bold initiative aims to provide real-time data from within the heart of the volcano, potentially transforming eruption forecasting.

• Mike Poland [06:08]: "And to answer these important questions, to kind of take the next big leap in improving our forecasts, Mike says it's not just about continuing to improve our monitoring equipment."

The concept involves creating a "glass-bottomed volcano" by drilling into the magma chamber and installing monitoring instruments that can withstand extreme temperatures.

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Implementation: Building the Magma Observatory

Volcanologist John Eichelberger narrates the inception of this ambitious project, which gained traction after accidental drilling into a magma chamber in Iceland resulted in the formation of obsidian glass plugs instead of explosive eruptions.

• John Eichelberger (Volcanologist 2) [15:37]: "Oh, it's going to erupt. It's going to destroy the whole thing."

Inspired by these incidents, Eichelberger collaborated with international scientists to propose a deliberate drilling project at the Krafla volcanic site in Iceland.

• Jan Lavallee (Volcanologist 3) [17:25]: "The first international magma observatory."

The team plans to install a drill rig, cool the drilling path with fluids to prevent immediate eruption, and embed measuring devices within the cooled glass pocket formed at the magma chamber's edge.

• Jan Lavallee [19:56]: "So they'll take tools like these, stuff that measures temperature and pressure in real time, and they will lower those into their pocket."

As the cooling fluids cease, magma will gradually reheat the glass pocket, eventually enveloping the instruments. This controlled process aims to provide a window into the magma chamber's dynamics.

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Potential Impacts and Expert Opinions

The proposed magma observatory promises to revolutionize volcanology by offering unprecedented insights into magma behavior, eruption precursors, and the fundamental physics governing volcanic activity.

• Jan Lavallee [21:43]: "I don't think we can really fully conceive how it's going to change things, but I think it will be revolutionary. There's no doubt about it."

Mike Poland expresses optimism about the project's potential to yield unexpected discoveries.

• Mike Poland [22:01]: "It's whenever you try these things, you learn things, and often it's not what you expect."

Beyond improving eruption forecasts, the observatory could aid in harnessing geothermal energy and open avenues for scientific exploration previously deemed impossible.

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Conclusion

"The View from Inside a Volcano" presents a compelling narrative about the complexities of volcanic prediction and the innovative strategies scientists are employing to enhance our understanding. By potentially drilling into magma chambers, volcanologists aim to transform eruption forecasting, mitigate disaster risks, and unlock new scientific and energy opportunities. This episode underscores the relentless human quest to explore and comprehend the planet's most formidable natural phenomena.

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Notable Quotes

• Mike Poland [02:07]: "These clouds of ash that rush along the landscape at hurricane speeds... they're devastating."

• Filmmaker [03:56]: "This is a police station. It was entirely abandoned. It was a comfort for us not having the law hanging around."

• Jan Lavallee [19:56]: "So they'll take tools like these, stuff that measures temperature and pressure in real time, and they will lower those into their pocket."

• Volcanologist 3 [21:42]: "I don't think we can really fully conceive how it's going to change things, but I think it will be revolutionary. There's no doubt about it."

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Further Resources

• Krafla Magma Testbed (KMT): For more information on the magma observatory project, visit the Krafla KMT website krafla-kmt.com.

• Mike Poland's Paper: Partly Cloudy with a Chance of Lava Flows – An in-depth exploration of volcano forecasting methodologies.

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Credits

• Reported and Produced by: Byrd Pinkerton
• Edited by: Meredith Hoddinott and Jorge Just
• Music: Noam Hassenfeld
• Mixing and Sound Design: Christian Ayala
• Fact-Checking: Melissa Hirsch
• Special Thanks: Matt Haney

For more episodes and to support the show, visit vox.com/members.

Transcript

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[Host]

In the Caribbean, there is a beautiful island full of lush greenery called Basseterre. It is home to tens of thousands of people and a volcano.

[Volcanologist 1]

A volcano called Soufriere. Actually, there's seems like most volcanoes in the Caribbean are named Soufriere, but this one is Soufriere de Guadalupe.

[Host]

Mike Poland studies volcanoes for the U.S. geological Survey. He's kind of like a encyclopedia of interesting volcano stories. But the story he's telling me today takes place in the mid-1970s when this particular volcano started making concerning rumblings.

[Volcanologist 1]

So you were seeing more and more earthquakes. They were getting up to like magnitude threes. They were being felt. And then there were these sort of steam explosions.

[Host]

And people knew that earthquakes and steam explosions like this could be a clue that a more dramatic eruption was on the way.

[Volcanologist 1]

There is a history of really bad eruptions in the Caribbean. For example, in 1902, there were a pair of eruptions that happened right on top of one another that killed tens of thousands of people.

[Host]

These kinds of volcanoes are so deadly because they can cause massive ash flows.

[Volcanologist 1]

These clouds of ash that rush along the landscape at hurricane speeds. They're full of gas and bits of pulverized rock and they're incredibly hot. So imagine getting hit by a hurricane of really, really hot wind that's loaded with rocks, and on an island where there's not lot of room to get out of the way, they're devastating. So there's a healthy respect for volcanoes in the Caribbean because of those sorts of events. So 1976 comes along. There's a lot of unrest at Soufria de Guadalupe. And there's a question of what's going to happen and if there is going to be an eruption, how impactful will it be? And what should people on the island do?

[Host]

Should they stay and hope for a small eruption or should they evacuate the island? And if they did evacuate, when could they come back?

[Volcanologist 1]

It's not quite the same as evacuating like in advance of a hurricane, where there's an event that's going to. Or a wildfire. Right. It happens. It goes through your area and then you go back. Volcanic eruptions or volcanic unrest are sort of famous for kind of lingering on in places. There can be low level eruptive activity that goes on for years.

[Host]

The government authorities did eventually decide to evacuate. So more than 70,000 people had to leave the island. And the situation was so dramatic that the filmmaker Werner Herzog made a documentary about it called La Soufriere. He flew down to film the empty city.

[Filmmaker]

It was as spooky as a science fiction locale.

[Host]

He made his way through the streets, noting things like traffic lights signaling to no one and animals wandering around. All in kind of classic Herzog fashion.

[Filmmaker]

This is a police station. It was entirely abandoned. It was a comfort for us not having the law hanging around.

[Host]

And then as Rachmaninoff music starts to swell under his narration, Herzog explains that he left the island flying out on a helicopter.

[Filmmaker]

During the flight, we got the impression that these were the last hours of this town and the last pictures ever taken of.

[Host]

All. Feels kind of tragic, this city that's about to be lost forever.

[Volcanologist 1]

Except the ensuing eruption was minor.

[Host]

If anything, the evacuation itself wound up being more of an issue than the volcano. People were away from their homes for months. Kids schooling was disrupted and there was a lot of economic fallout. All of it unnecessary.

[Volcanologist 1]

But what if it had been necessary?

[Host]

Like two decades later in the Philippines, when volcanologists predicted a big eruption, evacuated people. And the ensuing eruption was enormous. Like one of the biggest eruptions in the 20th century. That evacuation saved a lot of lives.

[Volcanologist 1]

So this is the problem. How do you know how big an eruption's going to be? Because you don't want to evacuate too soon. You don't want to evacuate too broad an area. Or, you know, you don't want to evacuate too late or evacuate too small an area.

[Host]

You don't want to ignore a problem. But you also don't want to be the volcanologist who cry eruption. Right. And have your warnings ignored down the line.

[Volcanologist 1]

Yeah, Pretty much now.

[Host]

We've come a long way since the 1970s, right? Volcanologists have installed a lot more monitoring equipment on volcanoes, and they've made better equipment over time. So their forecasts have improved a lot as a result. But Mike says that in some ways, volcanologists are still grappling with the same fundamental problem here. They're pretty good at predicting whether a volcano will erupt, but they could even now, still be better at predicting what those eruptions will look like.

[Volcanologist 1]

Once an eruption starts, is it going to be one that lasts a long time? Will it get to be a big eruption? Will it be a kind of a piddly eruption? That's really hard to tell.

[Host]

And to answer these important questions, to kind of take the next big leap in improving our forecasts, Mike says it's not just about continuing to improve our monitoring equipment. What we really need is better information about volcanoes themselves and specifically about the hot molten rock that powers them. Which is why a couple of researchers are proposing something that seems both bold and a little absurd.

[Volcanologist 1]

They want to build a magma observatory. Basically, they want to drill into a magma chamber.

[Host]

So literally, they want to go deep, deep into the swirling, fiery heart of a volcano, a place that can be thousands of degrees, this furnace of molten minerals, and they want to build a little monitoring station right in that furnace.

[Volcanologist 1]

And that would give us some idea of what's going on in there.

[Host]

So this is unexplainable. I'm Bird Pinkerton, and today on the show, the plan to learn more about volcanoes by drilling into the heart of one and making an observatory there. The first question here is just why, right? Like, why would it help us improve our predictions if we went down into a volcano's hot little heart? To answer that question, I think it helps to understand a little bit about how we currently forecast eruptions. So Mike says right now, researchers can make some really good guesses about what volcanoes might do in the future based on what those volcanoes have done in the past. But that's actually kind of the issue that he has with a lot of volcano forecasting.

[Volcanologist 1]

A lot of the forecasting of eruptions is based on pattern recognition.

[Host]

Right now, researchers can take really impressive, really precise measurements of earthquake activity and gas emissions and all kinds of other stuff, and sometimes even measure, like, millimeter movements of the Earth. But at the end of the day, Mike says that a lot of it boils down to saying, like, x is happening, and when X happened before Y happened afterwards, so maybe Y will happen again soon.

[Volcanologist 1]

It's not necessarily based on any special understanding. Of the physics of volcanic activity or that particular volcano. It's more based on, okay, we've seen this before, we've seen this movie before, and we know how it's likely to evolve over time.

[Host]

Mike likes to compare this to how we forecast the weather, because in the past, weather scientists also relied on this kind of pattern matching.

[Volcanologist 1]

I mean, decades ago, you sort of said, well, the pressure's dropping and it's starting to get colder, so I think there may be a storm coming.

[Host]

But then weather forecasting essentially went through a revolution. Scientists gathered huge amounts of data about the atmosphere. They used satellites to measure surface temperatures and circulation patterns. They collected information about clouds and wind and rain. Like people flew directly into the eyes of hurricanes. Right. To measure what was happening inside of those storms.

[Volcanologist 1]

And this really abundant information was then used by modelers who could then use those details to work out the physics of what's going on.

[Host]

Weather scientists still definitely use historical patterns to help them predict the future. But they've also built these really sophisticated models, models of the physics of the atmosphere.

[Volcanologist 1]

And based on that, we can now forecast with some degree of accuracy whether a hurricane will form. How intense is it going to be, where it's going to go. You know, obviously not every forecast is perfect, and that's because our knowledge is still imperfect. But they know enough to be able to make these forecasts and even show how uncertain they are. That's incredible. That's amazing.

[Host]

Sounds like you're jealous.

[Volcanologist 1]

I am. Maybe a little. Volcanology is not there.

[Host]

And the reason volcanology isn't there is not for lack of trying. Right. The problem is that to really understand the physics of a volcano, you have to understand the physics of something called a magma chamber. Picture your classic volcano. Right? In my mind, I see a mountain sticking up into the sky. At the top of that mountain, maybe there's a crater, maybe even like a lake of bright hot red lava bubbling away in that crater. And it's all very exciting, but it's also just the tip of the volcano.

[Filmmaker]

Berg.

[Host]

If you then descend down through the volcano, through layers and layers and miles and miles of rock, you'll find the thing that's usually depicted in, like, a geology textbook as the fiery red balloon underneath the pointy mountain. This is the magma chamber. It's where hot minerals from Earth's mantle have pushed up into the Earth's crust. And it's the source of the volcano. Essentially, it's its heart. It is why hot rock and ash is bursting up through the surface. But it is also Wildly complicated. A magma chamber can have hot liquid rock, some of it thousands of degrees Fahrenheit, but it can also have some solid material. There are hotter parts and cooler parts and different minerals melting at different heats and different gases too, that might make pressure build up. And all these things are potentially roiling and moving around in different ways and sometimes exploding upwards in eruptions.

[Volcanologist 1]

So we draw them as red balloons. They are not. They're super complex. But it's a very difficult thing to represent.

[Host]

That is the challenge though, right? In order to do better forecasting for volcanoes, researchers need to find a way to represent these chambers better. And to do that, they need to do the volcanic equivalent of what the weather scientists gather lots of data and sort out all the physics. But because magma chambers are so deep and so hot, volcanologists can't just fly into them like a hurricane. Right. They've done their best to take measurements from up here at the surface to take the equivalent of like X rays of the Earth, for example. But that's not direct information.

[Volcanologist 1]

You know, we don't have the cutaway like the glass bottomed volcano where you can just sort of look into and go like, oh, well, that's what's going, oh, okay.

[Host]

But after the break, what if you could make a glass bottomed volcano by drilling down directly into a volcano's heart?

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Fueled by the magnified blast of hammer.

[Host]

The volcano's fury reaches the breaking point and erupts.

[Volcanologist 2]

A story or a story? Well, it is a yarn of sorts.

[Host]

The story John Eichelberger is telling starts with an accident in the 2000s. Some scientists were working in collaboration with some power companies drilling down into the rock near a volcano in Iceland when they accidentally drilled right into a magma chamber.

[Volcanologist 2]

Yeah, this was a big shock to, to everybody.

[Host]

And you might think this would be a big, dramatic problem.

[Volcanologist 2]

Oh, it's going to erupt. It's going to destroy the whole thing.

[Host]

But instead of like hot rock shooting out of their hole in an explosion of fire or something, the magma basically climbed a little ways up the hole and then cooled off into a plug of dark obsidian glass. When John heard about this and a couple of other similar accidents in other parts of the world, he thought, what.

[Volcanologist 2]

Am I going to do about it? How do I get in on this?

[Host]

Because the thing about John is he has been studying volcanoes for a while now.

[Volcanologist 2]

Oh my God. If you start counting for my PhD, then it's five decades.

[Host]

And over the course of those decades, he became kind of obsessed with this question of what was happening deep down in the heart of volcanoes. He thought knowing more could help people forecast better, also maybe let people tap into volcanoes for geothermal power. But he couldn't really drill down into a magma chamber himself to investigate because people didn't know what would happen if you drilled down into a magma chamber until these drilling accidents. They were very good news for John.

[Volcanologist 2]

Yes, given my obsession, I was very excited about it.

[Host]

As John remembers it, he wound up meeting someone from one of the power companies in Iceland that was connected to the drilling. And the guy said that the power company was open to letting John come do some research in the area.

[Volcanologist 2]

I thought, oh, boy. Okay. So I set about gathering my friends together from all over the world, and.

[Volcanologist 3]

50 or 60 of us spend best part of a week together browsing ideas as to what could we learn if we were to do this? What could we learn if we were to drill back in the magma?

[Host]

Jan Lavallee is a volcanologist at LMU Minchin. He was invited to this first gathering in 2014. And this gathering was kind of the start of a dream.

[Volcanologist 2]

Dream of magma dancing in my head.

[Volcanologist 3]

The first international magma observatory.

[Host]

The location for this dream was a volcanic spot in Iceland called Krafla.

[Volcanologist 3]

It's quite bare land. It's beautiful.

[Volcanologist 2]

There's a lot of steam coming out of the ground.

[Volcanologist 3]

There's a beautiful lake that is just azurite blue. It's amazing color, and it's reflecting sunlight when there's sunshine there and pure color, it's gorgeous.

[Host]

And even more importantly, the Icelandic power company that they're working with has already gathered lots of data on this volcanic system, which means that it has, like, a wealth of information and also a lot of infrastructure that the team can draw on.

[Volcanologist 3]

So it is the right place to do this.

[Host]

Oh, it is. This exactly the initial plan for the magma observatory that Jan and John and their various collaborators are trying to get funded, it's pretty simple. They want to try and drill down to a magma chamber again, but this time, they want to do it on purpose.

[Volcanologist 3]

So how we're going to do this is, first, we're going to install a drill rig at the earth's surface, and we're going to start drilling.

[Host]

As they get deeper and deeper, the ground will get hotter and hotter. So they're going to pump a lot of fluid in there to kind of cool things way down. Their drilling will create cracks in the rock ahead, and fluid will rush into those cracks, Cooling things down some more. And when they drill deep enough to hit the magma chamber itself, the fluid will cool a little bit of that molten magmatic rock down, too, and it.

[Volcanologist 3]

Will quench it, and it will vitrify to a glass.

[Host]

So then they'll have a lump of dark, black glass, like a blob of obsidian at the edge of a molten magma chamber. And the researchers will then kind of carve into that glass while keeping it cool to make this hollow pocket, essentially. And once that glass pocket is made, they will drop a bunch of measuring devices into it. So Jan works with tools in his lab that are made of the same kinds of heavy duty materials that we put into stuff like jet engines, stuff that can operate at a really high.

[Volcanologist 3]

Heat at 1000 or even 1500 degrees Celsius.

[Host]

So they'll take tools like these, stuff that measures temperature and pressure in real time, and they will lower those into their pocket and then they will stop cooling things down, stop pumping in cool fluid, which means that very slowly the heat of the surrounding molten rock will start warming the glass pocket back up again and the glass will slowly turn back into melted magma and then it.

[Volcanologist 3]

Will engulf all of the instruments by flowing around them.

[Host]

It'll take a while for the magma to melt completely and mix in with the magma around it so that it's its normal self. But then hopefully these researchers will have their observatory, their kind of glass bottom volcano, if you'll allow for dark melted glass. And looking into that glass bottom volcano will finally give them real time, direct updates about what is happening down in an active magma chamber.

[Volcanologist 2]

To get really good scientific information, you have to be patient. And the idea here is to have an international infrastructure like we do in other fields of science, like particle accelerators or telescope arrays or space missions. Big science, expensive science that can't be done by small groups.

[Host]

If they get this big science going, it could help them understand the fundamental physics of volcanoes. It could help people forecast eruptions better. It could also potentially let them explore a new source of energy and it could maybe even lead to things they're not imagining yet.

[Volcanologist 3]

I don't think we can really fully conceive how it's going to change things, but I think it will be revolutionary. There's no doubt about it.

[Host]

Even Mike Poland, who isn't directly involved with this project at all, is pretty enthusiastic about its potential.

[Volcanologist 1]

I am excited to hear what, what they can come up with. You know, it's whenever you try these things, you learn things, and often it's not what you expect. It's maybe not what you go in there thinking you're going to learn. So yeah, no matter what you go into a magma chamber, you're going to learn some things.

[Host]

If you want to read more about the dream of a magma observatory, check out the website for the Kafla Krafla magma testbed, also known as kmt. We'll also link to it in the transcript. You can also learn more about volcano forecasting by checking out Mike Poland's paper Partly Cloudy with a Chance of Lava Flows. This episode was reported and produced by Me Bird Pinkerton. It was edited by Meredith Hodnot and Jorge Just. Meredith also runs the show. Noam Hassenfeld made the music for this episode. Christian Ayala did the mixing and the sound design. Melissa Hirsch checked our facts because she's a hero and a queen. Melissa don't fact check that. Julia Longoria is the fact that toads don't cause warts. And I am always, always, always grateful to Brian Resnik for co creating the show. Extra thanks this week also to Matt Haney for his time. If you have thoughts about volcanoes or other cool things that we should cover, please Write in to unexplainableox.com I mean it when I say that your emails make my day. If you want to support the show and help us keep making it, please join our membership program that [e-mail] members. You can also support us by leaving a nice rating or a review or just by telling people in your life to listen. And before I go, I want to especially shout out the listener who wrote in to tell us that the show made them want to become a biologist someday because our whole team is rooting for you and any other would be scientists out there who are listening. Unexplainable is part of the Vox Media Podcast Network and we'll be back next week.