Lahar deposit cross section in the Trout Lake lowland, which originated from Mount Adams. Thickness of deposit is about 2.5 m (8 ft).
Images
Volcano Hazard Program images.
![Lahar deposit cross section in the Trout Lake lowland, which origin...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1228.jpg?itok=za8_lDti)
Lahar deposit cross section in the Trout Lake lowland, which originated from Mount Adams. Thickness of deposit is about 2.5 m (8 ft).
![Erratics located on a cinder cone on the northeast flank of Newberry](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img415.jpg?itok=qCA0WU3L)
Erratics located on a cinder cone on the northeast flank of Newberry Volcano, Oregon.
Erratics located on a cinder cone on the northeast flank of Newberry Volcano, Oregon.
![Before the eruption of May 18, 1980, Mount St. Helens' elevation wa...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img957.jpg?itok=UCHXnaxK)
Mount Adams elevation is 3,745 m (12, 286 ft). Mount St. Helens was the smallest of five major volcanic peaks in Washington State.
Mount Adams elevation is 3,745 m (12, 286 ft). Mount St. Helens was the smallest of five major volcanic peaks in Washington State.
![Mount St. Helens prior to the catastrophic eruption of May 18, 1980...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img992.jpg?itok=1wq7zUfn)
Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.
Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.
![Debris flow runout paths in Vargas state, Venezuela...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1331.jpg?itok=xd7oLJ98)
Oblique aerial photograph of source areas and runout paths of some of the devastating debris flows that were responsible for more than 20,000 fatalities in Vargas state, Venezuela, December 1999.
Oblique aerial photograph of source areas and runout paths of some of the devastating debris flows that were responsible for more than 20,000 fatalities in Vargas state, Venezuela, December 1999.
![Volcanic mudflows (lahars and debris flows) occur more commonly aft...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3255.jpg?itok=lMJ7SqEV)
Volcanic mudflows (lahars and debris flows) occur more commonly after a landscape has been covered by loose volcanic material. Sign on the slopes of Rabaul, Papua New Guinea.
Volcanic mudflows (lahars and debris flows) occur more commonly after a landscape has been covered by loose volcanic material. Sign on the slopes of Rabaul, Papua New Guinea.
![Landslides in the Western Columbia Gorge, Skamania County, Washingt...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img4757.jpg?itok=LkPvNu-U)
Recent light detection and ranging (lidar) imagery has allowed us to identify and map a large number of previously unrecognized landslides, or slides, in heavily forested terrain in the western Columbia Gorge, Skamania County, Washington, and it has revealed that the few previously recognized areas of instability are actually composites of multiple smaller landslide
Recent light detection and ranging (lidar) imagery has allowed us to identify and map a large number of previously unrecognized landslides, or slides, in heavily forested terrain in the western Columbia Gorge, Skamania County, Washington, and it has revealed that the few previously recognized areas of instability are actually composites of multiple smaller landslide
![Mount Hood in the not-so-far distance beyond Downtown Portland, Ore...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img1117.jpg?itok=aIVi_KxS)
Mount Hood in the not-so-far distance beyond Downtown Portland, Oregon. Photograph taken at the top of the Portland Aerial Tram line on Marquam Hill.
Mount Hood in the not-so-far distance beyond Downtown Portland, Oregon. Photograph taken at the top of the Portland Aerial Tram line on Marquam Hill.
Geologic Map of the Washougal Quadrangle, Clark County, Washington and Multnomah County, Oregon (Scientific Investigation Map 3257).
Geologic Map of the Washougal Quadrangle, Clark County, Washington and Multnomah County, Oregon (Scientific Investigation Map 3257).
![Volcano Disaster Assistance scientists working with colleagues from...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3354.jpg?itok=Dxh1UC9i)
The station is a lahar monitoring station with a broadband seismometer and video camera. Data from the station use radio telemetry to send real time information to the Instituto Geofisico of Ecuador.
The station is a lahar monitoring station with a broadband seismometer and video camera. Data from the station use radio telemetry to send real time information to the Instituto Geofisico of Ecuador.
Join us July 25-29, 2016, for a 5-day educator workshop at Mount Rainier. The workshop features informative talks on Cascade volcanoes and volcanic processes, ideas for classroom activities, hikes into the field, and tips for organizing school field trips to visit the volcano. There is no charge for this workshop and camping is available to participants.
Join us July 25-29, 2016, for a 5-day educator workshop at Mount Rainier. The workshop features informative talks on Cascade volcanoes and volcanic processes, ideas for classroom activities, hikes into the field, and tips for organizing school field trips to visit the volcano. There is no charge for this workshop and camping is available to participants.
![Hood to protect air intake from ashfall for GenSet equipment in Bar...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3305.jpg?itok=n1KiUaBE)
Hood to protect air intake from ashfall for GenSet equipment in Bariloche, Argentina, following 2011-2012 eruption of Cordon Caulle volcano, Chile.
Hood to protect air intake from ashfall for GenSet equipment in Bariloche, Argentina, following 2011-2012 eruption of Cordon Caulle volcano, Chile.
![Water-tube tiltmeter installed in 1956 in an underground vault near...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3339.jpg?itok=lE-KcCTy)
The Uwekahuna WT (water-tube) instrument is still measured today, providing one of the longest records of deformation for any volcano. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch.
The Uwekahuna WT (water-tube) instrument is still measured today, providing one of the longest records of deformation for any volcano. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch.
![GPS measurements provide models of the direction and rate (length o...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3340.png?itok=QH4IhFmn)
GPS measurements provide models of the direction and rate (length of arrow) of deformation at the summit of Mauna Loa. Arrows pointing in multiple directions away from the summit indicate inflation.
GPS measurements provide models of the direction and rate (length of arrow) of deformation at the summit of Mauna Loa. Arrows pointing in multiple directions away from the summit indicate inflation.
![Ash buries cars and buildings after the 1984 eruption of Rabaul, Pa...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3254.jpg?itok=3uuh0gx1)
Ash buries cars and buildings after the 1984 eruption of Rabaul, Papua New Guinea.
Ash buries cars and buildings after the 1984 eruption of Rabaul, Papua New Guinea.
![Water-tube tiltmeter "pot" installed in 1956 in an underground vaul...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3261.jpg?itok=LTOkMjut)
The Uwīkahuna WT (water-tube) instrument is still measured today, providing one of the longest records of deformation for any volcano. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch.
The Uwīkahuna WT (water-tube) instrument is still measured today, providing one of the longest records of deformation for any volcano. The tiltmeter is read by looking into the portal on each pot and adjusting the sight until two pins appear to touch.
![Pyroclastic flow cartoon depicting the flow moving down the slope o...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3264.jpg?itok=3Jnad_he)
Pyroclastic flow cartoon depicting the flow moving down the slope of a volcano through a valley.
Pyroclastic flow cartoon depicting the flow moving down the slope of a volcano through a valley.
![Insar interferogram depicting Mt. St. Helens deformation (surface e...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3266.png?itok=DMBP_YXT)
LOS = Line of Sight
Big Pine Volcanic Field, California, from southwest cinder cone, with US Route 395 and Owens River in view
Big Pine Volcanic Field, California, from southwest cinder cone, with US Route 395 and Owens River in view
![Pyroclastic flow (dense darker grey billowing mass) travels down sl...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3287.jpg?itok=BH64TgEN)
Pyroclastic flow (dense darker grey billowing mass) travels down slope of Mayon volcano, Philippines while ash column rises from the vent. Dilute, lighter-colored ash billows off leading edge.
Pyroclastic flow (dense darker grey billowing mass) travels down slope of Mayon volcano, Philippines while ash column rises from the vent. Dilute, lighter-colored ash billows off leading edge.
![Example of an event-tree schematic used when forecasting the probab...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/vhp_img3292.png?itok=HmC4bpD8)
Example of an event-tree schematic used when forecasting the probable scenarios that may play out in the event of volcanic unrest or eruption. Scenarios are updated as events unfold.
Example of an event-tree schematic used when forecasting the probable scenarios that may play out in the event of volcanic unrest or eruption. Scenarios are updated as events unfold.