Skip to main content
U.S. flag

An official website of the United States government

News

Filter Total Items: 110
link

When it comes to calderas, how big is big?

Talking about calderas means venturing into superlatives - huge volumes of magma and topographic changes on a regional, even state-sized scale. But...

Read Article
link

Getting sphere-ious about spherulites

If you ever have the chance to visit the silica-rich Hot Creek rhyolite lava flow in the Long Valley Caldera, you might get the sense that you're...

Read Article
link

USGS volcano scientists visit Long Valley

If you were visiting Long Valley this past week, you might have seen a cavalcade of SUVs periodically disgorging people wielding rock hammers, hand...

Read Article
link

A CalVO library classic book: Dana's "Characteristics of Volcanoes"

As CalVO moves from its Menlo Park location to its new home at Moffett Field, scientists have the monumental task of deciding what to preserve and...

Read Article
link

Fall into a burning (curtain) of fire with fissure eruptions

If you've been following the latest geological news, you'll have noticed the brand new eruption on Iceland's Reykjanes Peninsula. It's a classic...

Read Article
link

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...

Read Article
link

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. 

Read Article
link

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...

Read Article
link

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...

Read Article
link

Having a (volcanic) field day in California

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

Read Article
link

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...

Read Article
link

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...

Read Article