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Mount Shasta's spectacular lenticular clouds

Mount Shasta's spectacular lenticular clouds

It's that time of year...when Mount Shasta tries to fool us all into thinking the volcano is up to something! But as many residents of Northern...

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Hazard-ception: Fires are a hazard for monitoring California's hazardous volcanoes

Hazard-ception: Fires are a hazard for monitoring California's hazardous volcanoes

While volcanoes are certainly one of California's most prominent natural hazards, they are by far one of the least common. Seasonal hazards such as...

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Paleomagnetic analysis is (super) cool with a cryogenic magnetometer

Paleomagnetic analysis is (super) cool with a cryogenic magnetometer

A cryogenic magnetometer may sound like something out of a scifi show, but it's actually an important tool for figuring out the eruption histories at...

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Exploring lava tubes at Medicine Lake volcano

Exploring lava tubes at Medicine Lake volcano

If you didn’t know that volcanoes can form their own caves, follow along to learn more about lava tubes! 

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New study reveals the deep roots of early eruptions in the Clear Lake Volcanic Field

New study reveals the deep roots of early eruptions in the Clear Lake Volcanic Field

How do volcanic fields get their start? By looking at crystals in the oldest lavas in a field, geoscientists can tell a story about the rocks’ pathway...

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Tiny zircon crystals tell a big eruption story in the Coso Volcanic Field

Tiny zircon crystals tell a big eruption story in the Coso Volcanic Field

How do CalVO scientists create a timeline of eruptions from radioactive elements stored in tiny crystals? The Coso volcanic field is one place where a...

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Keeping watch on Mammoth Mountain's volcanic breath

Keeping watch on Mammoth Mountain's volcanic breath

What if we told you that scientists can monitor a volcano's "breathing" 24/7, even through deep winter snow? That's exactly what CalVO's permanent gas...

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Water and debris are a recipe for lahars at California’s volcanoes

Water and debris are a recipe for lahars at California’s volcanoes

Debris flows or mudflows that form from volcanic material are called lahars. The word lahar comes from Javanese, the language spoken on the island of...

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The value of volcano eruption photographs

The value of volcano eruption photographs

Photographs can be a huge help in interpreting the mechanics and timelines of volcanic eruptions. For example, he 1914–1917 eruptions of Lassen Peak...

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What have volcanoes got in their veins? In some places, tuffisite!

What have volcanoes got in their veins? In some places, tuffisite!

Many of us are used to seeing elongated “veins” in the rocks around us - streaks of minerals that precipitated over time to fill fractures in the...

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Hot springs on the Goosenest? Not so fast!

Hot springs on the Goosenest? Not so fast!

A historic report on volcanoes in northern California by the volcanologist Howell Williams made a curious claim about Goosenest volcano. 

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In Memoriam: Wes Hildreth, 1938-2025

In Memoriam: Wes Hildreth, 1938-2025

The USGS California Volcano Observatory is saddened to announce the death of Edward Wesley (Wes) Hildreth III, in a vehicle accident on June 19, 2025...

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