Images

This seismic station in the Lassen Volcanic Center was damaged during the Dixie Fire of 2021, which burned huge swathes of forest in the Lassen Volcanic National Park. Above-ground equipment, including the tree that held the antenna and solar panel above winter snows, was destroyed; belowground seismic sensors were recoverable. USGS photo by Ryan Presser, NCSN.

This map shows the location of the June 24, 2024 earthquake swarm at the Lassen Volcanic Center relative to Lassen Peak and Growler & Morgan Hot Springs. Earthquakes are indicated by white, blue, and yellow circles, scaled to the earthquake size.

This digital helicorder record from station LSIB on the Northern California Seismic Network emphasizes the dozens of tiny earthquakes in Lassen's June 24 swarm. Earch line of the helicorder shows 15 minutes of time, with the entire record covering 24 hours.

Devils Kitchen in the Lassen Volcanic Region (within the bounds of the Lassen Volcanic National Park) is the second largest of Lassen's hydrothermal areas, after Bumpass Hell. Located in the Warner Valley in the southeast corner of the Park, Devils Kitchen contains boiling springs, mudpots, hot streams, and steam vents. USGS photo courtesy of Deb Bergfeld

Inverted funnel connected to thermoplastic tubing used to collect gas from a hot spring pool near Lassen Peak, California.

Geologic field-trip guide to Lassen Volcanic National Park and vicinity, California

Lassen Volcanic Center, California simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Titanium tubed used to collect gas from a fumarole near Lassen Peak, California.

Map showing one-year probability of accumulation of 1 centimeter (0.4 inch) or more of tephra from eruptions of volcanoes in the Cascade Range.

Volcanic Hazard Assessment for the Lassen Region, California is based upon a comprehensive investigation of the eruptive history and possible future eruption scenarios with associated volcanic hazards.

Lassen Peak viewed from the south at the summit of Brokeoff Volcano, Lassen Volcanic National Park.

Chaos Jumbles (foreground) is a rockfall avalanche that formed around 340 years ago when one of the Chaos Crags domes (background) collapsed.

Chaos Crags is a series of lava domes that erupted about 1,100 years ago from the Lassen Volcanic Center.

Cinder Cone erupted in the year 1666 in the Lassen Volcanic Region of northern California.

Eruptions in the Cascade Range during the past 4000 years. USGS GIP 64

Gas bubbles through a sample bottle containing alkaline solution, allowing for separation of different gas phases.

Lassen Peak's Devastated Area photographed from the air in 1994.

The original Lassen Volcano Observatory building, provided by the US Forest Service, about 1926. The observatory consisted of a small office over a 10x10 ft concrete cellar which housed two custom-built seismographs. A small cottage nearby housed Ruy H. Finch, the head of and sole scientist at the Observatory for much of its existence. (Photo by R.H.

The founder of the Lassen Volcano Observatory (1926-1935) and second Director of the Hawaiian Volcano Observatory (1940-1951), Ruy Herbert Finch conducted research in both Hawaii and throughout the Western United States.

Lassen Peak photographed from the Devastated Area about 4 hours before the explosive eruption of May 22, 1915.

Benjamin F. Loomis Historical Photograph Collection: Lassen Peak showing new lava flow on summit and large mudflows on slopes. Photo courtesy of NPS.