Images

Four tan cables, each 6 kilometers long, trail behind R/V Marcus G. Langseth. These cables record seismic sound waves that travel down into the Earth and reflect back from layers beneath the seafloor. The green cables provide the sound.

Research vessel (R/V) Marcus G. Langseth, operated by Lamont-Doherty Earth Observatory's Office of Marine Operations, can deploy several kilometers of cable to collect seismic data from beneath the seafloor.

A sailboat gets stuck under the Murray Street bridge over Santa Cruz Harbor in California, after it was washed free of its dock due to the strength of the tsunami wave from Japan. While the tsunami energy that hit the coast of California was relatively low, the wave energy is concentrated in narrow spaces like harbors.

February 25, 2011, San Pablo Bay data collection. At left, the platform at the Lower station is partly exposed to the air shortly after low tide. At right, the platform on mudflat at the Upper station is completely exposed to the air shortly after low tide on February 25, 2011.

Unusually high tides, sometimes called "king tides," offer a preview of coastal flooding likely to result from rising sea level. In this photograph, taken during a king tide on February 17, 2011, waves overtop Pier 14 in San Francisco, California.

A rotary sediment trap deployed in a channel on the reef flat off Puʻukoholā Heiau National Historic Site, Hawaiʻi, designed to collect samples of sediment being transported across the reef.

Jenny White (USGS PCMSC) and Lissa MacVean (USGS PCMSC) deploy an instrumented frame in the shallows of San Pablo Bay (northern San Francisco Bay) from R/V Retriever. The instrument is an ADCP (Acoustic Doppler Current Profiler).

At left, USGS Marine Technician Jenny White steadies an instrumented platform as it is winched into the water at the Middle station (see map of study area), where the depth of the bay floor is 0.5 m below MLLW. Photograph taken February 2, 2011, by Lissa MacVean.

On February 1, 2011, the USGS Pacific Coastal and Marine Science Center (PCMSC) team carried out a project using interferometric sidescan sonar to characterize the riverbed and channel banks of a 12 mile reach of the Sacramento River near the town of Knights Landing, California (River Mile 79 through River Mile 91).

Bathymetry—the measurement of water depth of a body of water (e.g., ocean, sea, river, bay, lake, etc.)

Estimated coastal inundation (blue shading) at Mission Bay in San Diego, California, using the Coastal Storm Modeling System (CoSMoS) developed for ARkStorm. (From USGS Open-File Report 2010-1312.) 

The ARkStorm scenario led by the USGS and hundreds of scientists and experts from many disciplines details impacts of a scientifically plausible storm similar to the Great California Storm of 1862 in the modern day.

Jumbo piston corer on deck of United States Coast Guard Cutter Healy in the Arctic Ocean.

In 2010, USGS researcher Brian Edwards recovers white chunks of gas hydrate (methane ice) mixed with gray sediment from a metal core sample tube retrieved from the seafloor in the Arctic Ocean at a water depth of approximately 8,000 feet.

Cross section of a hydrothermal vent chimney from East Diamante Caldera in the Mariana volcanic arc, west Pacific Ocean, collected during a 2010 research cruise. Most of the sample is zinc sulfide.

Cross section of a hydrothermal vent chimney from East Diamante Caldera in the Mariana volcanic arc, west Pacific Ocean, collected during a 2010 research cruise. Most of the sample is zinc sulfide.

John Pohlman (USGS, left) and colleagues from the University of Alaska Fairbanks examine a sediment core retrieved through winter ice from the bottom of a lake in northern Alaska. Such cores are used to reconstruct methane emissions and climate history over the past 20,000 years.

Bluff erosion during the 2009–10 El Niño undermined the Great Highway guardrail at Ocean Beach, San Francisco, California. The shoreline eroded, on average, 55 meters that winter, leading to lane closures on the highway and an emergency \$5-million revetment along the base of this bluff.

Bluff erosion during the 2009–10 El Niño undermined the Great Highway guardrail at the southern end of Ocean Beach, San Francisco, California. The shoreline eroded, on average, 55 meters that winter, leading to lane closures on the highway and an emergency \$5-million revetment along the base of this bluff. Photo taken by Jeff Hansen, USGS, 20 January 2010.

Severe coastal bluff erosion, along the southern end of Ocean Beach, San Francisco, California. This storm damage occurred during the 2009-2010 El Niño, which, on average, eroded the shoreline 55 meters that winter.

Severe bluff erosion, along the southern end of Ocean Beach, San Francisco, California, including damage to the guard rail of the Great Highway (Calif. Hwy.1). The severe winter erosion led to lane closures of the highway and an emergency, $5 million revetment along the base of this bluff.