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How tall are you really? Establishing Mount Shasta's summit elevation in the 20th century

How tall are you really? Establishing Mount Shasta's summit elevation in the 20th century

There are a couple of ways to make a volcano shorter: it could have an eruption or a debris avalanche, or it could simply erode over time. Or, it...

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Volcano Watch — HVO and Collaborators Continue Seismic Surveys Across the Active Volcanoes of Hawaii

Volcano Watch — HVO and Collaborators Continue Seismic Surveys Across the Active Volcanoes of Hawaii

The Island of Hawai‘i is one of the most seismically active regions in the world. In the last five years, an average of 600-1200 earthquakes per week...

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Volcano Watch — STEM and suction solutions at HVO

Volcano Watch — STEM and suction solutions at HVO

STEM is an acronym that stands for Science, Technology, Engineering and Mathematics. In the educational system, encouraging STEM curriculum prepares...

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How hot is Long Valley Caldera?

How hot is Long Valley Caldera?

Measuring the temperature of lava erupting on the Earth’s surface is possible with the right equipment. But how do you figure out the temperature of...

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Volcano Watch — Using acoustic signals to identify the start of 2022 Mauna Loa eruption

Volcano Watch — Using acoustic signals to identify the start of 2022 Mauna Loa eruption

The 2022 eruption of Mauna Loa occurred late in the evening of November 27th. The eruption was preceded by intense earthquake activity about half an...

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Photo and Video Chronology — Quiet at Kīlauea summit on March 21, 2024

Photo and Video Chronology — Quiet at Kīlauea summit on March 21, 2024

On March 21, 2024, HVO geologists made a routine visit to check on equipment at the summit of Kīlauea.

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Volcano Watch — Establishing a Nascent Monitoring Program on Pico Basile Volcano, Equatorial Guinea

Volcano Watch — Establishing a Nascent Monitoring Program on Pico Basile Volcano, Equatorial Guinea

In 2012, steam began to rise from beneath the cracked concrete of a telecommunication station at the summit of Pico Basile volcano on Bioko Island...

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One schist, two schist, greenschist, blueschist: Metamorphosed volcanic rocks in California

One schist, two schist, greenschist, blueschist: Metamorphosed volcanic rocks in California

While California has plenty of active volcanoes, it also has a rich history of volcanism preserved in its Franciscan Complex rocks.

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Volcano Watch — What was an emergency manager doing at a scientific conference?

Volcano Watch — What was an emergency manager doing at a scientific conference?

On the Island of Hawaiʻi, frequent eruptions foster a close relationship between the USGS Hawaiian Volcano Observatory (HVO) and the Hawaiʻi County...

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Volcano Watch — Hawaii represented at the Cities on Volcanoes conference in Antigua, Guatemala

Volcano Watch — Hawaii represented at the Cities on Volcanoes conference in Antigua, Guatemala

In February, the volcanological community gathered for the 12th edition of Cities on Volcanoes (COV12), a conference of the International Association...

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Mud pot, mud seep, or mud volcano?

Mud pot, mud seep, or mud volcano?

We recently received a question about how mud volcanoes form and why they're distinct from "real" volcanoes (the kind involving magma), so we're here...

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Volcano Watch — Kīlauea intrusion was a textbook example of dike propagation

Volcano Watch — Kīlauea intrusion was a textbook example of dike propagation

From January 31 to February 3, 2024, a magma intrusion into Kīlauea’s flank, southwest of the summit caldera, was the focus of attention at the USGS...

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