Mount Shasta

Stratovolcano flank vents and the origin of Black Butte

jlball@usgs.gov — Mon, 24 Apr 2023 18:16:30 EDT

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

Lidar reveals the true faces of California's volcanoes

jlball@usgs.gov — Tue, 4 Apr 2023 12:53:28 EDT

Volcanoes in California (and everywhere!) are often covered with vegetation, including thick forests. Fortunately, the USGS can use laser technology to cut through the canopy and reveal the geology beneath.

Gas sampling at Mount Shasta builds a long-term record of volcanic emissions

jlball@usgs.gov — Fri, 4 Jun 2021 06:30:00 EDT

One of the three main ways that California Volcano Observatory scientists monitor the state’s threatening volcanoes is by sampling the gases that are released from magma deep below (in addition to monitoring seismicity and deformation).

Unpacking CalVO's new seismic monitoring boxes

jlball@usgs.gov — Wed, 13 May 2020 12:30:00 EDT

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 monitoring system have been implemented which allow us to focus on unrest specifically related to our volcanoes and volcanic regions.

Which U.S. volcanoes pose a threat?

rmcclymont@usgs.gov — Wed, 19 Dec 2018 06:30:00 EST

USGS Volcanic Threat Assessment updates the 2005 rankings.

Explore California's volcanic legacy and future with new field trip guides

twoods@usgs.gov — Wed, 5 Apr 2017 06:15:00 EDT

California is well-known for its frequent earthquakes, but less so for its volcanic history – despite the fact that the most recent eruption in the state occurred just 100 years ago.

Volcano Watch — Exploring USGS volcano observatories—Part 3: California

jgittens@usgs.gov — Thu, 19 Jan 2017 01:00:00 EST

This month, our Volcano Watch articles are exploring U.S. Geological Survey (USGS) volcano observatories and their connections to Hawai‘i. This week: California, here we come!

Fieldwork "Fun" Has Begun

twoods@usgs.gov — Mon, 27 Jun 2016 10:15:00 EDT

Summer has arrived, and for many CalVO scientists, so has the season of fieldwork. During the fall, winter and spring, many of California's volcanoes are covered with snow, and challenging weather conditions make fieldwork difficult and time consuming.

Mount Shasta earthquake series poses no immediate hazard

twoods@usgs.gov — Fri, 3 Apr 2015 06:00:00 EDT

Since February 19, 2015 an ongoing series of small earthquakes has been occurring approximately 5 miles southeast of the summit of Mount Shasta, near the Clear Creek Trailhead on a regional, unnamed fault at about 3-5 miles depth.

Mount Shasta debris flow not linked to volcanic activity

twoods@usgs.gov — Thu, 25 Sep 2014 05:15:00 EDT

On the afternoon of September 20, a large volume of water surged down Mount Shasta's south flank into Mud Creek, entraining debris and inundating the drainage and roads near McCloud, California.