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A brief history of the Lassen Volcano Observatory (1926-1935)

A brief history of the Lassen Volcano Observatory (1926-1935)

Before there was a California Volcano Observatory or even a Long Valley Observatory, a tiny cabin in northern California housed the first full-time...

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Recent large earthquakes near Lassen are just another day in the Basin and Range

Recent large earthquakes near Lassen are just another day in the Basin and Range

Since May 11, 2023, a series of M5+ earthquakes and aftershocks have rattled the area around Lake Almanor, a reservoir about 20 miles (32 km)...

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Altered states (of volcanic rock)

Altered states (of volcanic rock)

How does hot water bring down volcanic slopes?

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Unpacking CalVO's new seismic monitoring boxes

Unpacking CalVO's new seismic monitoring boxes

If you've noticed any changes to the earthquake counts released in CalVO's weekly updates, don't worry - some behind-the-scenes improvements to our...

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Which U.S. volcanoes pose a threat?

Which U.S. volcanoes pose a threat?

USGS Volcanic Threat Assessment updates the 2005 rankings.

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Geologic maps lay the foundation for this virtual tour of western states volcanoes.

Geologic maps lay the foundation for this virtual tour of western states volcanoes.

Take a virtual geologic tour in the USGS Geonarrative, Volcanic Landscapes.

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Field-trip guide for Lassen Volcanic Center published

Field-trip guide for Lassen Volcanic Center published

USGS geologists Patrick Muffler and Michael Clynne published a new geologic field-trip guide for areas in and around Lassen Volcanic National Park in...

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Lassen Peak Eruption 100th Anniversary - May, 2015

Lassen Peak Eruption 100th Anniversary - May, 2015

2015 marks the centennial of the May 22, 1915 explosive eruption of Lassen Peak.

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