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Caldera Chronicles

Caldera Chronicles is a weekly article written by U.S. Geological Survey Yellowstone Volcano Observatory scientists and colleagues.

Caldera Chronicles

Filter Total Items: 355
Yellowstone GPS stations help to monitor solar storms that cause widespread auroras

Yellowstone GPS stations help to monitor solar storms that cause widespread auroras

For a couple nights in May an extreme solar storm created a beautiful night sky for many people in areas that normally are too far away to see auroras...

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Solving the mystery of the “Pearlette volcanic ash”

Solving the mystery of the “Pearlette volcanic ash”

The Yellowstone volcanic system is known for its ash-flow tuffs—thick, compressed ash deposits from caldera-forming eruptions. But thinner ash beds...

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The hot and cold journey of silica begins in Yellowstone’s rhyolite and ends in geyser cones, petrified trees, and algae

The hot and cold journey of silica begins in Yellowstone’s rhyolite and ends in geyser cones, petrified trees, and algae

Rhyolite is the most abundant rock in Yellowstone, and it contains about 75% silica. When it reacts with hot groundwater, much of the silica ends up...

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Earthquake focal mechanisms – life’s a beach(ball)

Earthquake focal mechanisms – life’s a beach(ball)

What does a beachball have to do with an earthquake?  Turns out, beachballs are key to understanding the characteristics of the fault that slipped to...

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The YVO 2023 Annual Report has hit the streets!

The YVO 2023 Annual Report has hit the streets!

Want to know the number and pattern of earthquakes that occurred in the Yellowstone region in 2023?  Or what interesting new geyser activity took...

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Going, going, argon! Determining volcanic eruption ages with argon geochronology

Going, going, argon! Determining volcanic eruption ages with argon geochronology

Argon dating is a powerful tool for determining when volcanoes erupted in the past. This technique works on a multitude of volcanic materials—from...

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McDermitt caldera: An early caldera of the Yellowstone hotspot track

McDermitt caldera: An early caldera of the Yellowstone hotspot track

Yellowstone caldera is the most recent in a series of volcanic structures that stretches across the Snake River Plain of Idaho and into northern...

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Using radioactive radium to better understand Yellowstone’s hydrothermal system

Using radioactive radium to better understand Yellowstone’s hydrothermal system

You may have heard of radium in connection to French scientists Marie and Pierre Curie, or because it is in an environmental hazard. But what is it...

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Is Yellowstone overrated? As a disaster movie subject, maybe…

Is Yellowstone overrated? As a disaster movie subject, maybe…

Many people regard Yellowstone as an exceptional place that merits only positive superlatives. But in much of the broadcast, streaming, and popular...

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Gas emissions and temperatures measured at the new Tern Lake thermal area

Gas emissions and temperatures measured at the new Tern Lake thermal area

A team of scientists visited the new thermal area near Tern Lake to sample gases and measure temperatures.  The results of their work provide a...

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Unpacking the legacy of water chemistry research in Yellowstone National Park, 1883–present

Unpacking the legacy of water chemistry research in Yellowstone National Park, 1883–present

The record of water chemistry data in Yellowstone predates the development of the pH (acidity) scale!  These data are a testament to numerous...

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Thermal infrared remote sensing at Yellowstone 301: Thermal metrics

Thermal infrared remote sensing at Yellowstone 301: Thermal metrics

Is Yellowstone heating up, or cooling down?  How much heat is radiating away from the surface in Yellowstone’s thermal areas, and how does it change...

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