USGS volcanologist David Sherrod discusses activity at Ol Doinyo Lengai volcano with the Director of the Tanzanian Geological Survey, Abdul Mruma, as a local Maasai woman observes.
Images
USGS volcanologist David Sherrod discusses activity at Ol Doinyo Lengai volcano with the Director of the Tanzanian Geological Survey, Abdul Mruma, as a local Maasai woman observes.
USGS Scientist David Sherrod surveys Ol Doinyo Lengai Volcano in Tanzania with scientists from the Geological Survey of Tanzania and local villagers.
USGS Scientist David Sherrod surveys Ol Doinyo Lengai Volcano in Tanzania with scientists from the Geological Survey of Tanzania and local villagers.
Marinna Martini, Woods Hole, Coastal and Marine Science Center, prepares to deploy tripods at three sites along the outer perimeter of Diamond Shoals, North Carolina.
Marinna Martini, Woods Hole, Coastal and Marine Science Center, prepares to deploy tripods at three sites along the outer perimeter of Diamond Shoals, North Carolina.
USGS researchers deploying an instrumented minipod South of Fire Island, NY.
USGS researchers deploying an instrumented minipod South of Fire Island, NY.
![Crater Lake, Chaski Bay. Talus slope sits on flat top of massive sl...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1276.jpg?itok=kXXVhBgU)
View southwest of Garfield Peak and Eagle Crags above Chaski Bay. Cliffs at caldera rim are andesite of Applegate Peak (unit aa; ca. 210-270 ka), overlain by two thin flows of andesite of Garfield Peak at top center (unit ag; 224 ±9 ka). Talus rests on flat top of massive slide block that consists of altered lavas of units aa, ak(?), and db(?).
View southwest of Garfield Peak and Eagle Crags above Chaski Bay. Cliffs at caldera rim are andesite of Applegate Peak (unit aa; ca. 210-270 ka), overlain by two thin flows of andesite of Garfield Peak at top center (unit ag; 224 ±9 ka). Talus rests on flat top of massive slide block that consists of altered lavas of units aa, ak(?), and db(?).
![Sun Creek Valley with Crater Lake in background, aerial view lookin...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1277.jpg?itok=wW_6tIbf)
Morning aerial view looking northwest up the valley of Sun Creek. Applegate Peak caps the prominent rock wall of the west side of Sun Notch at the caldera rim. Northwest caldera wall is visible on opposite side of Crater Lake through Sun Notch. Grayback Ridge in foreground is thick lava of pre-Mazama rhyodacite (410-460 ka).
Morning aerial view looking northwest up the valley of Sun Creek. Applegate Peak caps the prominent rock wall of the west side of Sun Notch at the caldera rim. Northwest caldera wall is visible on opposite side of Crater Lake through Sun Notch. Grayback Ridge in foreground is thick lava of pre-Mazama rhyodacite (410-460 ka).
![Aerial view west across the upper part of Medicine Lake Volcano tow...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img226.jpg?itok=hmFIczgV)
Medicine Lake lies within the shallow basin of Medicine Lake caldera. Glass Mountain flow, draped over the east side of the volcano, is the youngest lava flow at the volcano. The northeasternmost dacite tongue extends nearly to the bottom of the photo (distal lobes are outlined to enhance visibility).
Medicine Lake lies within the shallow basin of Medicine Lake caldera. Glass Mountain flow, draped over the east side of the volcano, is the youngest lava flow at the volcano. The northeasternmost dacite tongue extends nearly to the bottom of the photo (distal lobes are outlined to enhance visibility).
![Side-by-side comparison of the northwest wall of Kīlauea Caldera on...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img5000.png?itok=dH3KORa2)
Side-by-side comparison of the northwest wall of Kīlauea Caldera on a clear day (left) and a day with thick vog (right). HVO observation tower and building can be seen near the center in each photo.
Side-by-side comparison of the northwest wall of Kīlauea Caldera on a clear day (left) and a day with thick vog (right). HVO observation tower and building can be seen near the center in each photo.
![Eruptions in the Cascade Range during the past 4000 years. USGS GIP...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1052.jpg?itok=QIebYTeq)
Eruptions in the Cascade Range during the past 4000 years. USGS GIP 64
Eruptions in the Cascade Range during the past 4000 years. USGS GIP 64
![Vog obscures view during slack or no tradewinds at the summit of Kī...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img2993.jpg?itok=lFHULQS8)
Vog obscures view during slack or no tradewinds at the summit of Kīlauea Volcano, Hawai‘i
Vog obscures view during slack or no tradewinds at the summit of Kīlauea Volcano, Hawai‘i
Woods Hole Coastal and Marine Science Center's Ellyn Montgomery (right) on the helipad of the Canadian Coast Guard Vessel Louis St. Laurent returning from an ice reconnaissance flight as part of a joint study mapping the foot of the continental slope in the Arctic Ocean in 2008
Woods Hole Coastal and Marine Science Center's Ellyn Montgomery (right) on the helipad of the Canadian Coast Guard Vessel Louis St. Laurent returning from an ice reconnaissance flight as part of a joint study mapping the foot of the continental slope in the Arctic Ocean in 2008
![Shaded relief map (shades of gray) of part of Berkeley, Calif, including locations of Hayward Fault and Cal stadium](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/CalStadiumFault_1.jpg?itok=TjAS8OyM)
A filtered vertical laser image, taken using a technique called light detection and ranging (LIDAR), of part of the Hayward Fault (red lines) in the City of Berkeley. The fault passes through the University of California Berkeley football stadium (left), and past earthquake movements have significantly offset Hamilton Gulch (center).
A filtered vertical laser image, taken using a technique called light detection and ranging (LIDAR), of part of the Hayward Fault (red lines) in the City of Berkeley. The fault passes through the University of California Berkeley football stadium (left), and past earthquake movements have significantly offset Hamilton Gulch (center).
![2 side-by-side maps showing amount of ground shaking in 1868 & 1989 earthquakes. Yellow is light shaking. Reds are stronger shak](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/Loma1868shakemaps.jpg?itok=CvGY7IeE)
ShakeMap showing the inferred intensity of ground shaking in the 1868 earthquake (measured as MMI, or Modified Mercalli Intensity), compared to a ShakeMap for the 1989 magnitude 6.9 Loma Prieta earthquake.
ShakeMap showing the inferred intensity of ground shaking in the 1868 earthquake (measured as MMI, or Modified Mercalli Intensity), compared to a ShakeMap for the 1989 magnitude 6.9 Loma Prieta earthquake.
![Shaded relief and combined bathymetry map of Puerto Rico](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/seafloor_at_0.gif?itok=sOB1aB1B)
(Top image) Shaded relief of the new multibeam bathymetry along the Puerto Rico Trench illuminated from the northwest. Thin contours indicate bathymetry at 500-m intervals. (Bottom image) Combined bathymetry map of the multibeam bathymetry data, single-beam bathymetry compilation around Puerto Rico, Lidar data near shore, and topography of Puerto Rico.
(Top image) Shaded relief of the new multibeam bathymetry along the Puerto Rico Trench illuminated from the northwest. Thin contours indicate bathymetry at 500-m intervals. (Bottom image) Combined bathymetry map of the multibeam bathymetry data, single-beam bathymetry compilation around Puerto Rico, Lidar data near shore, and topography of Puerto Rico.
Static stress change models for known or hypothesized faults in the Hispaniola and Puerto Rico subduction segments due to (a) slip on a patch of the Puerto Rico subduction zone, and (b) slip on a patch of the Hispaniola subduction zone. An open arrow denotes slip direction and the patches are marked by dashed rectangles.
Static stress change models for known or hypothesized faults in the Hispaniola and Puerto Rico subduction segments due to (a) slip on a patch of the Puerto Rico subduction zone, and (b) slip on a patch of the Hispaniola subduction zone. An open arrow denotes slip direction and the patches are marked by dashed rectangles.
A pressurized, stable, hydrate-bearing sediment core can be fed through the IPTC body, shown here being used in Singapore to support the Indian National Gas Hydrates Program (NGHP1)
A pressurized, stable, hydrate-bearing sediment core can be fed through the IPTC body, shown here being used in Singapore to support the Indian National Gas Hydrates Program (NGHP1)
View of the west channel and Upper monitoring station (Station 1), Chalk Cliffs, CO.
View of the west channel and Upper monitoring station (Station 1), Chalk Cliffs, CO.
![Scientists operate scientific sediment coring equipment with a tall metal barrel and tripod on a sandy beach near the water.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/NB_FtDesoto_2009_Original.jpg?itok=Pp26LOgk)
USGS staff collecting a sediment core on Ft. Desoto Beach, Florida using vibracoring equipment. This type of sediment coring uses the vibration of an electric motor to sink an aluminum core barrel into the ground. When the core barrel enters the ground the sediment in the ground fills up the barrel and the crew uses the tripod to pull the core out of the ground.
USGS staff collecting a sediment core on Ft. Desoto Beach, Florida using vibracoring equipment. This type of sediment coring uses the vibration of an electric motor to sink an aluminum core barrel into the ground. When the core barrel enters the ground the sediment in the ground fills up the barrel and the crew uses the tripod to pull the core out of the ground.
The USGS Gas Hydrates Project integrates across USGS mission areas, programs, and regions. The stars indicate the locations of personnel involved in the Gas Hydrates Project. Within the US, much of the research focuses on the Gulf of Mexico and Alaska, which represent marine and permafrost-associated settings for gas hydrates, respectively.
The USGS Gas Hydrates Project integrates across USGS mission areas, programs, and regions. The stars indicate the locations of personnel involved in the Gas Hydrates Project. Within the US, much of the research focuses on the Gulf of Mexico and Alaska, which represent marine and permafrost-associated settings for gas hydrates, respectively.
![Area in northern Alaska where subsurface temperature and pressure conditions are conducive to the occurrence of gas hydrates](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/gashydrates_alaska.jpg?itok=U_OOuymQ)
![HVO geologist on rim of Halema‘uma‘u Crater downloading camera imag...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3335.jpg?itok=YoVgJ9Mw)
HVO geologist downloads images collected with infrared cameras set up on the rim of Halema‘uma‘u Crater. The cameras are aimed at an erupting lava lake to conduct a thermal survey of the lake's surface.
HVO geologist downloads images collected with infrared cameras set up on the rim of Halema‘uma‘u Crater. The cameras are aimed at an erupting lava lake to conduct a thermal survey of the lake's surface.