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California Volcano Observatory images.

Filter Total Items: 179
In this black-and-white photos, a view up a valley shows a bare moonscape of mud, silt, and boulders. In the far distance, a mountain peak rises above lines of pine trees lining the valley's sides.
Mudflows in Lost Creek, Lassen, May 22 1915
Mudflows in Lost Creek, Lassen, May 22 1915
Mudflows in Lost Creek, Lassen, May 22 1915

Benjamin F. Loomis Historical Photograph Collection: Lost Creek drainage area covered in mud, rocks, and debris from a mudflow off Lassen Peak. Photo courtesy of NPS.

Benjamin F. Loomis Historical Photograph Collection: Lost Creek drainage area covered in mud, rocks, and debris from a mudflow off Lassen Peak. Photo courtesy of NPS.

A black and white photograph looks across a swath cut through a pine forest by a debris and mud flow that originates at a steaming volcanic peak in the distance. A large crater is visible on the side of the volcano, which is emitting the steam. The rest of the volcano is heavily blanketed in snow.
Benjamin Loomis photograph of Lassen Peak and the Devastated Area, May 22, 1915
Benjamin Loomis photograph of Lassen Peak and the Devastated Area, May 22, 1915
Benjamin Loomis photograph of Lassen Peak and the Devastated Area, May 22, 1915

Steam issuing from summit of Lassen Peak from head of Lost Creek following mudflow. "Hot Rock"(large boulder) in foreground. Photographs taken a few hours prior to second major eruption and hot blast.

In a black-and-white photo, a snow-covered mountain peak is streaked with dark mud flowing down its sides in three directions. One flow directly faces the viewer, showing where trees have been mowed over by the debris. Elsewhere on the slopes, pine trees are scattered through the snow.
Lava and mudflows from Lassen Peak, May 22, 1915
Lava and mudflows from Lassen Peak, May 22, 1915
Lava and mudflows from Lassen Peak, 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.

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

A black and white photograph looks across a swath cut through a pine forest by a debris and mud flow that originates at a steaming volcanic peak in the distance. A large crater is visible on the side of the volcano, which is emitting the steam. The rest of the volcano is heavily blanketed in snow.
Historical photograph of Lassen Peak by Benjamin Loomis, May 22, 1915
Historical photograph of Lassen Peak by Benjamin Loomis, May 22, 1915
Historical photograph of Lassen Peak by Benjamin Loomis, May 22, 1915

A second view of Lassen Peak and the Deveastated Area following an explosive eruption and mudflowk. The crater of the volcano is visible, revealing that a lava dome which had previously been growing there was destroyed by the explosion. Subsequently, a lava flow began refilling the crater, and was mistakenly thought to have created the mudflow. 

A second view of Lassen Peak and the Deveastated Area following an explosive eruption and mudflowk. The crater of the volcano is visible, revealing that a lava dome which had previously been growing there was destroyed by the explosion. Subsequently, a lava flow began refilling the crater, and was mistakenly thought to have created the mudflow. 

A sepia-toned historical photograph shows an open field with people standing near a row of wooden-framed well structures and pipes. A thin jet of gas or water sprays upward from two of the wells. Forested hills and a mountain rise in the background.
Kelseyville Gas Wells, ca.1910
Kelseyville Gas Wells, ca.1910
Kelseyville Gas Wells, ca.1910

Photograph of men at the Kelseyville Gas Wells, ca.1910, by M. Rieder. Courtesy of California Historical Society Collection, University of Southern California Digital Libraries. 

Photograph of men at the Kelseyville Gas Wells, ca.1910, by M. Rieder. Courtesy of California Historical Society Collection, University of Southern California Digital Libraries. 

A black-and-white stereograph photo pair shows a horse-drawn cart advancing toward the photographer on a muddy dirt road. In the middle ground, an early-20th century hotel is flanked by other small shops and a single telegraph pole. In the background, a double-peaked snow clad mountain rises high above the town, faded with distance.
Stereograph photo of Mount Shasta and the town of Sisson in 1906
Stereograph photo of Mount Shasta and the town of Sisson in 1906
Stereograph photo of Mount Shasta and the town of Sisson in 1906

Horse-drawn carriage on road in Sisson, California, El Monte Hotel in foreground, Mount Shasta in the background. Image courtesy of the Library of Congress.

Photograph of the town of Sisson (later (1922) the town of Mt. Shasta) in the distance at the foot of Mount Shasta in winter. Snow covered fir trees in the foreground.
Town of Sisson at the foot of Mount Shasta in winter, ca.1900
Town of Sisson at the foot of Mount Shasta in winter, ca.1900
Town of Sisson at the foot of Mount Shasta in winter, ca.1900

Photograph of the town of Sisson (later (1922) the town of Mt. Shasta) in the distance at the foot of Mount Shasta in winter. Snow covered fir trees in the foreground. Photo courtesy of University of Southern California Libraries and California Historical Society. Digitally reproduced by the USC Digital Library.

Photograph of the town of Sisson (later (1922) the town of Mt. Shasta) in the distance at the foot of Mount Shasta in winter. Snow covered fir trees in the foreground. Photo courtesy of University of Southern California Libraries and California Historical Society. Digitally reproduced by the USC Digital Library.

USGS Director Jim Reilly being given a tour of the CalVO Ops room by Emily Montgomery-Brown
USGS Director Jim Reilly being given a tour of the CalVO
USGS Director Jim Reilly being given a tour of the CalVO
USGS Director Jim Reilly being given a tour of the CalVO

In a February 5, 2019 visit, USGS Director Jim Reilly was given a tour of CalVO facilities, including the Operations Room. Here Emily Montgomery-Brown explains the networks that monitor California's threatening volcanoes.

In a February 5, 2019 visit, USGS Director Jim Reilly was given a tour of CalVO facilities, including the Operations Room. Here Emily Montgomery-Brown explains the networks that monitor California's threatening volcanoes.

Infographic about the 2019 report "California's Exposure to Volcanic Hazards"
California's Exposure to Volcanic Hazards
California's Exposure to Volcanic Hazards
California's Exposure to Volcanic Hazards

Infographic about the 2019 report "California's Exposure to Volcanic Hazards"

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