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Shaded relief map showing Lassen Volcanic National Park, with Lassen Peak labeled in the northern portion of the map, Growler & Morgan hot springs to the southwest, and the June 24 2024 swarm to the southeast
Lassen Volcanic Center earthquake swarm of June 24, 2024
Lassen Volcanic Center earthquake swarm of June 24, 2024
Lassen Volcanic Center earthquake swarm of June 24, 2024

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 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.

Helicorder record showing dozens of tiny earthquake traces occurring over 12 hours, with each line comprising 15 minutes and earthquakes looking like drum cymbals turned on their sides.
LSIB helicorder trace from the Lassen Volcanic Center on June 24, 2024.
LSIB helicorder trace from the Lassen Volcanic Center on June 24, 2024.
LSIB helicorder trace from the Lassen Volcanic Center on June 24, 2024.

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.

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.

A steaming hot spring and stream flow through the yellow-and-white altered rock of a hydrothermal area. A raised walkway is visible in the background.
Devil's Kitchen hydrothermal area in the Lassen Volcanic Center
Devil's Kitchen hydrothermal area in the Lassen Volcanic Center
Devil's Kitchen hydrothermal area in the Lassen Volcanic Center

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

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

Collecting gases from a hot spring pool near Lassen Peak, California
Collecting gases from a hot spring pool near Lassen Peak, California
Collecting gases from a hot spring pool near Lassen Peak, California
Collecting gases from a hot spring pool near Lassen Peak, California

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 vici...
Geologic field-trip guide to Lassen Volcanic National Park
Geologic field-trip guide to Lassen Volcanic National Park
Geologic field-trip guide to Lassen Volcanic National Park

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

Lassen Volcanic Center, California simplified hazards map showing p...
Lassen Volcanic Center, CA simplified hazards map
Lassen Volcanic Center, CA simplified hazards map
Lassen Volcanic Center, CA simplified hazards map

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

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

Videos

Image of the Week - Dixie Fire Ravages Northern California
Image of the Week - Dixie Fire Ravages Northern California
Image of the Week - Dixie Fire Ravages Northern California

The Dixie Fire has become the largest single fire in California's recorded history. State fire officials don't list it at the top, however. The record is held by the massive August Complex fire of 2020 which burned over one million acres. The term "complex" is used when multiple fires in the same area ignite separately.

The Dixie Fire has become the largest single fire in California's recorded history. State fire officials don't list it at the top, however. The record is held by the massive August Complex fire of 2020 which burned over one million acres. The term "complex" is used when multiple fires in the same area ignite separately.