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The Mystery of the Noon Booms Part 2

The Mystery of the Noon Booms Part 2

In last week's post (https://www.usgs.gov/observatories/calvo/news/mystery-noon-booms-part-1), we challenged you to give us your best hypotheses as to...

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The Mystery of the Noon Booms: Part 1

The Mystery of the Noon Booms: Part 1

Just in time for the Fourth of July, CalVO scientists have been seeing some interesting - but unusual - acoustic signals on our seismometers. 

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Bubble trouble? Tracking changing hydrothermal features in Long Valley's Hot Creek

Bubble trouble? Tracking changing hydrothermal features in Long Valley's Hot Creek

If you spend time in Long Valley, you may have noticed some changes in the Hot Creek springs and pools following this winter's dramatic snows...

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We're ready for our closeup! Filming virtual field trip stops in the Clear Lake Volcanic Field

We're ready for our closeup! Filming virtual field trip stops in the Clear Lake Volcanic Field

California Volcano Monitor: This past week, you might have seen a truck full of geologists toting video equipment around the Clear Lake Volcanic Field...

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Having a (volcanic) field day in California

Having a (volcanic) field day in California

Today we feature volcanoes that are outstanding in their fields - volcanic fields, that is!

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What makes Long Valley's resurgent dome reach for the skies?

What makes Long Valley's resurgent dome reach for the skies?

While the huge caldera-forming eruption of Long Valley was 767,000 years ago, between about 670,000 and 570,000 years ago uplift of the caldera's...

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10 Ways Mount St. Helens Changed Our World

10 Ways Mount St. Helens Changed Our World

The 1980 eruption of Mount St. Helens had a profound impact on how we live with active volcanoes. Looking back over the last four decades, we have...

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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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The story of the faulted field: How Pinnacles ended up almost 200 miles north of its birthplace

The story of the faulted field: How Pinnacles ended up almost 200 miles north of its birthplace

One of California's coastal volcanic fields, the Pinnacles volcanic field (or Pinnacles National Park) is an eroded collection of mostly rhyolite lava...

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Visualizing volcanic volumes

Visualizing volcanic volumes

Scale is very important to volcanologists - not just for photos, but when thinking about the relative size (or volume) of natural features.

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Stratovolcano flank vents and the origin of Black Butte

Stratovolcano flank vents and the origin of Black Butte

You might envision a stratovolcano as one massive cone with a single summit crater. But in reality, volcanoes are complex constructions that may have...

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Lidar reveals the true faces of California's volcanoes

Lidar reveals the true faces of California's volcanoes

Volcanoes in California (and everywhere!) are often covered with vegetation, including thick forests. Fortunately, the USGS can use laser technology...

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