Images

USGS scientists Dan Powers (left) and Andy Ritchie retrieving a core sample from beneath Lake Ozette aboard research vessel Hadai.

Image map of study area showing (a) study region, (b) study sites, (c, d) example orthomosaic images, and (e) photo of SET 1.

Multibeam bathymetry shown in the spectrum from red (shallower) to blue (deeper) for depths greater than 200 m across the head of Astoria Canyon. The land and continental shelf are shown in grayscale slope shading where darker colors represent steeper slopes.  The modern Columbia River is far right.

Topography and bathymetry of southern Cascadia, which includes southern Oregon and northern California (seafloor depths between 200 and 3000 m are shown in the spectrum color scale from red (shallower) to purple (deeper). The land and continental shelf are shown in grayscale slope shading where darker colors represent steeper slopes.

Photographs showing equipment used during bathymetric and topographic surveys along the Columbia River littoral cell, Washington and Oregon.

 Two UNC mini landers, surrounded by Sablefish (Anoplopoma fimbria) and pink sea urchins, incubate seawater in situ to enable calculations of methane oxidation rates.

Red plumes burst out from the tops of these chemosynthetic tubeworms, capturing hydrogen sulfide and oxygen from the surrounding water to feed their bacterial endosymbionts. The tubeworm tubes provide a habitat for several benthic animals, including the pale pink branching octocorals seen here

Bathymetric map of Lake Ozette, showing locations of core samples (red circles).

Evolution of the shoreline around the Elwha River mouth, Washington, before, during and after dam removal, 2011–2017. Two large dams were removed from the Elwha River between 2011 and 2014 in the largest dam removal worldwide thus far, releasing more than 20 million tons of sediment downstream.

Building 3 on the USGS Western Region campus in Menlo Park, California.

Building 1 formerly housed many different USGS groups, including the Western Coastal and Marine Geology team, but slowly has been leased out to other federal agencies like the Transportation Security Administration (TSA) and Veterans Affairs (VA). At the right is the Menlo Survey Federal Credit Union.

Map showing rates of shoreline change on the north coast of Alaska. Rates range from -15 meters per year to +11 meters per year.

As one of four panelists at a briefing held by the Environmental and Energy Study Institute (EESI) and the Coastal States Organization, Dr.

PCMSC's Geometrics GeoEel Multichannel Streamer sits on the deck of R/V Bold Horizon

This instrument, the Edgetech SB-516 or "chirp", emits acoustic signals that penetrate the sediment on the seafloor. The reflected sound is recorded and is used to create a cross-section image, or profile, of the sub-bottom.

NOAA ship Reuben Lasker docked in San Francisco with the Bay Bridge in the distance. On October 21, leadership from NOAA, USGS, and BOEM met with the scientists and crew of the EXPRESS expedition to learn about the multi-agency cooperative research campaign.

A view of the mouth of the Klamath River where it meets the Pacific Ocean in northern California. The river runs from Oregon to California. Four dams along the Klamath are pending removal. USGS is studying coastal watershed response to dam removal, including long-term before-after/control-impact (BACI) studies.

A science crew on M/V (marine vessel) Bold Horizon retrieve gear from offshore San Francisco.

USGS scientists on the back deck of M/V Bold Horizon in San Francisco Bay: (back row, standing: left to right) Brandon Nasr, Danny Brothers, Travis Alonghi (USGS student contractor), Gerry Hatcher, Jenna Hill, Pete Dal Ferro, and Jenny McKee; (front row, kneeling: left to right) USGS scientists Janet Watt and Nora Nieminski.

The Rossfelder P-5 vibracorer, with its polybuterate liner visible, is secured on the deck of the research vessel Bold Horizon, awaiting deployment off the coast of California just north of San Francisco. More liners are stored in a cage off to the side.

USGS science crew from Pacific Coastal and Marine Science Center work together to get the vibracorer coring device in position to collect sediment core samples off San Francisco, California.