News

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...

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)...

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

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

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

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

Did you know that Long Valley is not the only caldera in California? In fact, there are at least 5.

Today we're highlighting an unusual type of California volcano: Seamounts!

How does hot water bring down volcanic slopes?

The U.S. Geological Survey recently released a new Volcano Hazards Program Strategic Science Plan for 2022-2026.