Geology

Kīlauea's Continuing Summit Eruption At Hawai'i Volcanoes National Park

The episodic summit eruption of Kīlauea in Halemaʻumaʻu crater has been going on for over three months now, with 16 eruptive episodes displaying lava fountains and lava flows within Kaluapele (the summit caldera).

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By Hawaiian Volcano Observatory - April 6th, 2025

Spectacular Waterfalls Are An Often-Hidden Gem Of Yellowstone National Park

Yellowstone National Park is famous for its volcanic landscapes, erupting geysers, colorful hot springs, and abundant and diverse wildlife. The park is also unique because of the many waterfalls along its rivers and creeks that mostly form in deep gorges, where rocks with differences in hardness meet or at the edges of thick rhyolite lava flows.

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By Yellowstone Volcano Observatory - April 1st, 2025

What Do Volcanologists Learn From Ashfall Maps?

How do volcanologists determine the height of eruptive plumes from Yellowstone’s past explosive eruptions? Ironically, you have to dig into the ground to get the answer.

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March 25th, 2025

Yellowstone: Where There’s Always Something New!

Geologically speaking, things are always changing at Yellowstone—especially in the hydrothermal areas. It’s simply the nature of the complex hydrothermal system that overlies one of the planet’s largest magma reservoirs.

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By Yellowstone Volcano Observatory - March 18th, 2025

Slow As A Sloth Or Swift As A Sprinter? Clocking The Speed Of Yellowstone’s Magma

To time how fast a sprinter runs, you just need a stopwatch. To time how fast magma moves, you need to know a little bit about chemistry.

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By Yellowstone Volcano Observatory - March 12th, 2025

Kīlauea Continues To Put On A Dazzling Show At Hawai'i Volcanoes National Park

The Kīlauea volcano at Hawai'i Volcanoes National Park continues to put on a dazzing show, with fountains of lava being spit 400-500 feet into the air.

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By Hawaiian Volcano Observatory - March 11th, 2025

Volcano Watch | Fountains Of Lava At Hawai'i Volcanoes National Park

Kīlauea volcano at Hawai'i Volcanoes National Park is in a unique phase of activity in Halemaʻumaʻu, with 12 episodes of dual lava fountains since December 23, 2024.

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By Hawaiian Volcano Observatory - March 8th, 2025

Yellowstone And Hawaiʻi—How Similar Are They?

The US hosts two of the world’s most famous volcanic systems: Yellowstone and Hawaiʻi. These systems a well known for producing large volumes of magma through time and leaving chains of volcanic features in their wake, although they do so in very different ways.

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By Yellowstone Volcano Observatory - February 25th, 2025

Observing Non-Earthquake Signals On The Yellowstone Seismic Network

The Yellowstone Seismic Network is designed to record ground shaking due to earthquakes. But earthquakes aren’t the only things that rattle the ground in Yellowstone!

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By Jamie Farrell, associate research professor with the University of Utah Seismograph Stations and Chief Seismologist of the Yellowstone Volcano Observatory. - February 19th, 2025

Yellowstone National Park: Where Geology Is On Display Nearly Everywhere

Yellowstone National Park is a popular destination for geology field trips. It’s easy to see why—the dynamic landscape contains a variety of geological wonders that are not easily seen elsewhere.

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By Richard Tollo - February 4th, 2025

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