Images

Location Map showing the Sur Pockmark Field outlined in green, individual pockmarks are shown as small red dots. This study focuses on the largest section of the pockmark field, from the Lucia Chica Channel down to the San Simeon Channel. AUV surveys are outlined in white and the offshore wind commercial leases are outlined in gray.

A diagram illustrating how the patterns of erosion and deposition associated with three sediment gravity flows could produce the stacked pockmarks and lateral migration observed in AUV-collected Chirp profiles. Long, uneventful episodes of hemipelagic drape (a, d, g, j) are intermittently interrupted by sediment gravity flows that either: 1b.

Diagram showing the sequence of land subsidence during an earthquake, followed with sand deposited by a tsunami.

Map showing location of Salmon River estuary, Oregon. Yellow dots represent estuaries, lagoons, and lakes with evidence of the 1700 tsunami.

View of Salmon River estuary, Oregon, from above. Sediment cores were collected from marshland toward the upper left of the image.

Animated GIF of Cascadia 1700 tsunami simulation at Salmon River, Oregon. Colored dots are locations where sediment cores were collected.

Ernest F. Hollings ACE Basin National Wildlife Refuge in South Carolina shown in the pop-out of the U.S. Coastal Wetlands Synthesis Applications geonarrative.   

Sediment core with tidal silt, tsunami sand, and marsh peat collected from the Salmon River estuary, Oregon.

The Southeast Region Refuges tab of the U.S. Coastal Wetlands Synthesis Applications geonarrative. A FWS and USGS collaboration.

The U.S. Coastal Wetlands Synthesis Applications geonarrative. The U.S. Geological Survey (USGS) is assessing the physical condition of coastal wetlands and how they may change in response to storms, sea-level rise, and human activity.

Ernest F. Hollings ACE Basin National Wildlife Refuge in South Carolina shown in the pop-out of the U.S. Coastal Wetlands Synthesis Applications geonarrative. 

Researchers Brian Atwater and Wendy Grant Walter conducting prior paleotsunami research at Salmon River estuary, Oregon.

Sediment core with tidal silt, tsunami sand, and marsh peat collected from the Salmon River estuary, Oregon.

USGS scientists SeanPaul La Selle and Jason Padgett collecting sediment cores at the Salmon River estuary, Oregon.

Coral cores collected within the National Park of American Samoa on the island of Ofu.

Scientists installing thermal camera in the National Park of American Samoa on Ofu.

USGS and NPS scientists collecting a coral core within the National Park of American Samoa on Ofu.

Underwater image of Valonia fastigiata algae growing on a reef in the National Park of American Samoa on Ofu.

Aerial image of a reef flat on Ofu, American Samoa, from a thermal drone that captures both regular images and radiometric images.

Diagram showing oceanographic and hydrogeologic processes including submarine groundwater discharge on Ofu, American Samoa.

Drone used to collect infrared imagery of reefs in the National Park of American Samoa on Ofu.