Marine Geohazards
Volcano Eruption - Hunga Tonga-Hunga Ha‘apai, Tonga
2022
Submarine Landslide - Resurrection Bay, Alaska
1964
Tsunami Damage - Natori, Japan
2011
Earthquake Damage - Fourth Avenue, Anchorage, Alaska
1964
Oil Spill - Deepwater Horizon, U.S. Gulf Coast
2016
Viscous Lava - Kīlauea, Hawai‘i
2018
Geologic activity in the ocean can cause dangerous or catastrophic events that threaten lives and critical infrastructure both at sea and on land. The USGS studies these geological events beneath the sea floor, known as marine geohazards, to provide decision makers with the information needed to mitigate risks to human communities, infrastructure, and the environment.
What are marine geohazards?
Marine geohazards, or ‘dangers in the deep’ include earthquakes, volcanic eruptions, submarine landslides, and tsunamis, as well as dissociation of gas hydrates—which can cause seafloor collapse—and oil spills or toxic seeps that affect deep sea life or change the physical characteristics of ocean environments.
Science to Address Hazards
Earthquakes, Landslides, and Tsunamis

Underwater earthquakes and landslides can generate tsunamis that cause hazards for coastal communities. USGS scientists study the subduction zone and the recent history of marine hazards and evaluate the future potential and probable impacts of such events on a regional basis. Quantifying these various hazards (e.g., earthquakes, landslides, tsunamis, and volcanoes) using geological and geophysical data, interpretations, and models improves understanding of the underlying processes of marine geohazards to assess the threats they pose. The USGS develops reliable deterministic and probabilistic estimates of the hazards that are used by engineers and policymakers to help reduce risk.
One barrier to measuring seismic risk has been the scarcity of high-resolution maps of the ocean floor. To fill these gaps, USGS scientists conduct high-resolution mapping offshore, especially near urban regions such as Southern California and the Pacific Northwest that are particularly at risk from seismic hazards. Creating three-dimensional views of the seafloor has given scientists remarkable ways to examine how a fault works, or how fluids may follow underground paths and potentially trigger submarine landslides. These landslides threaten offshore structures such as seafloor pipelines, cables, and equipment for oil and gas exploration. They can also trigger tsunamis that endanger coastal communities worldwide.
To discover a fault’s structure, scientists go to sea to collect streams of data that they turn into comprehensive underwater maps. This type of imaging, along with knowing the age of the sediment along faults and measuring other factors such as magnetics and density, can help tell the story of when the fault last ruptured or how fast it is moving. USGS incorporates these data, which have historically been challenging to collect, into earthquake models to estimate their actual hazard risk. Using high-resolution mapping and seismic technology to gather detailed seafloor data can directly impact human life and cities by improving earthquake and tsunami forecasts.
Research results are used in evaluations of earthquake risk zoning, public disaster education and preparedness, and engineering and building codes. Additionally, reassessing the threat of earthquake, tsunami, and landslide hazards to ports and nuclear power plants can directly impact facility management, emergency-management planning, and plant re-licensing.
The Atlantic and Gulf margins are heavily urbanized, support extensive port and industrial/resource facilities, and host 10 nuclear power plants. The USGS completed quantitative assessments of submarine landslides for the U.S. Atlantic coast from Maine to Florida and throughout the Gulf Region to better comprehend the risk of potential submarine landslides and tsunamis to these areas and associated infrastructure.



Gas Hydrates and Seafloor Collapse

Naturally occurring gas hydrates are ice-like combinations of water and (usually methane) gas that form in sediment below the sea floor and in areas of continuous permafrost when pressure and temperature conditions are appropriate.
In deep water marine settings where warm fluids are pumped from great depths below the seafloor for extraction of conventional oil and gas, heating of sediments near a well could lead to breakdown of gas hydrates and release gas and water. Intact gas hydrates generally strengthen marine sediments, and dissociation of gas hydrates could lead to subsidence or collapse of the seafloor near the well. Features associated with natural failure of the seafloor (landslides) have also been linked to gas hydrates in some cases. USGS scientists support submarine geohazards research through field-based surveys that refine understanding of the hydrates-slope failure association and through geotechnical studies that evaluate the response of sediments to dissociation or dissolution of gas hydrates.
Publications
Earthquake recurrence estimates for northern Caribbean faults from combinatorial optimization
Insights on gas hydrate formation and growth within an interbedded sand reservoir from well logging at the Qiongdongnan Basin, South China Sea
A scaling relationship for the width of secondary deformation around strike-slip faults
Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia
Late-Quaternary surface displacements on accretionary wedge splay faults in the Cascadia Subduction Zone: Implications for megathrust rupture
Science
Cascadia Subduction Zone Marine Geohazards
California Seafloor Mapping Program
Seafloor Faults off Southern California
Hazards: EXPRESS
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Connect
Coastal and Marine Hazards and Resources Program
12201 Sunrise Valley Dr
Reston, VA 20192
United States
Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA 95060
United States
St. Petersburg Coastal and Marine Science Center
600 4th Street South
St. Petersburg, FL 33701
United States
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole, MA 02543
United States
Natural Hazards Mission Area Headquarters
12201 Sunrise Valley Dr
Reston, VA 20192
United States
Water Resources Mission Area - Headquarters
USGS Headquarters
12201 Sunrise Valley Drive
Reston, VA 20192
United States
Multimedia
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Jumbo piston corer

Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.
Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.

Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.
News
We Make Treasure Maps: USGS Charts the Seafloor to Help Locate Critical Minerals, Precious Metals, and Other Vital Resources
Valuable Data Collected on M7.0 Earthquake Offshore Cape Mendocino, California
Seafloor Seismographs Rapidly Deployed Following Major Earthquake Offshore Northern California
Earthquake recurrence estimates for northern Caribbean faults from combinatorial optimization
Insights on gas hydrate formation and growth within an interbedded sand reservoir from well logging at the Qiongdongnan Basin, South China Sea
A scaling relationship for the width of secondary deformation around strike-slip faults
Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia
Late-Quaternary surface displacements on accretionary wedge splay faults in the Cascadia Subduction Zone: Implications for megathrust rupture
Methane seeps on the U.S. Atlantic margin: An updated inventory and interpretative framework
Modeled flooding by tsunamis and a storm versus observed extent of coral erratics on Anegada, British Virgin Islands— Further evidence for a great Caribbean earthquake six centuries ago
Crustal structure across the central Dead Sea Transform and surrounding areas: Insights into tectonic processes in continental transforms
Fast rupture of the 2009 Mw 6.9 Canal de Ballenas earthquake in the Gulf of California dynamically triggers seismicity in California
Long-term ocean observing for international capacity development around tsunami early warning
Marine paleoseismic evidence for seismic and aseismic slip along the Hayward-Rodgers Creek fault system in northern San Pablo Bay
California deepwater investigations and groundtruthing (Cal DIG) I: Fault and shallow geohazard analysis offshore Morro Bay
Cascadia Subduction Zone Marine Geohazards
California Seafloor Mapping Program
Seafloor Faults off Southern California
Hazards: EXPRESS
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Tsunami Hazards, Modeling, and the Sedimentary Record
Tsunami and Earthquake Research
Large Oil Spills
U.S. Geological Survey Gas Hydrates Project
Caribbean Tsunami and Earthquake Hazards Studies
Tracking Oil Spills: Before, During, and Decades Later
Piston and gravity core data collected during USGS cruise 2019-642-FA offshore of south-central California in support of the Bureau of Ocean Energy Management (BOEM) California Deepwater Investigations and Groundtruthing (Cal DIG I) alternative energy pro
Donated ROV vibracore and sampling data collected during Monterey Bay Aquarium Research Institute cruises in 2019 offshore of south-central California
Composite multibeam bathymetry surface and data sources of the southern Cascadia Margin offshore Oregon and northern California
Multichannel seismic-reflection and navigation data collected using SIG ELC1200 and Applied Acoustics Delta Sparkers and Geometrics GeoEel digital streamers during USGS field activity 2020-014-FA.
High-resolution multi-channel and Chirp seismic-reflection data from USGS cruise 2018-641-FA collected in south-central California in support of the Bureau of Ocean Energy Management Cal DIG I offshore alternative energy project
Reprocessed multichannel seismic-reflection (MCS) data from USGS field activity T-1-96-SC collected in San Diego Bay, California in 1996
High-resolution geophysical and geological data collected in Little Egg Inlet and offshore the southern end of Long Beach Island, NJ, during USGS Field Activities 2018-001-FA and 2018-049-FA
Multichannel minisparker, multichannel boomer, and chirp seismic-reflection data of USGS field activity 2017-612-FA collected in Puget Sound and Lake Washington in February of 2017
Chirp sub-bottom data of USGS field activity K0211PS collected in Puget Sound, Washington in April of 2011
Split-beam Echo Sounder and Navigation Data Collected Using a Simrad EK80 Wide Band Tranceiver and ES38-10 Transducer During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA.
Multichannel Seismic-Reflection and Navigation Data Collected Using Sercel GI Guns and Geometrics GeoEel Digital Streamers During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Jumbo piston corer

Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.
Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.

Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.

Multichannel seismic-reflection profile showing deformed and offset sediment layers below the outer continental shelf west of Sitka. The Sitka Sound fault is one of more than a dozen previously unmapped faults discovered in the July 2017 seismic-reflection data.
Multichannel seismic-reflection profile showing deformed and offset sediment layers below the outer continental shelf west of Sitka. The Sitka Sound fault is one of more than a dozen previously unmapped faults discovered in the July 2017 seismic-reflection data.
University of Washington's research vessel R/V Barnes is loaded with the USGS multichannel seismic system components GeoEel, Chirp, and boom plates.
University of Washington's research vessel R/V Barnes is loaded with the USGS multichannel seismic system components GeoEel, Chirp, and boom plates.
Seafloor offshore of Point Estero (PE) showing east (EH) and west (WH) strands of the Hosgri fault zone. Arrow points to a seafloor slope (a 12,000 year old shoreline) that has been offset by the east Hosgri strand, indicating a slip rate of about 2.6 millimeters per year.
Seafloor offshore of Point Estero (PE) showing east (EH) and west (WH) strands of the Hosgri fault zone. Arrow points to a seafloor slope (a 12,000 year old shoreline) that has been offset by the east Hosgri strand, indicating a slip rate of about 2.6 millimeters per year.
This piston corer recovers as much as 20 meters of sediment from below the seafloor, which is used to reconstruct the history of the Arctic Ocean and its sea ice.
This piston corer recovers as much as 20 meters of sediment from below the seafloor, which is used to reconstruct the history of the Arctic Ocean and its sea ice.
The airgun sled is painted orange and suspended from the A-frame. The three airguns are suspended beneath the sled. The multichannel digital streamer (yellow cable going into the water from the sled) is towed from the the weighted sled to keep it under the ice. This photo shows the number of crew required to safely deploy the airgun sled.
The airgun sled is painted orange and suspended from the A-frame. The three airguns are suspended beneath the sled. The multichannel digital streamer (yellow cable going into the water from the sled) is towed from the the weighted sled to keep it under the ice. This photo shows the number of crew required to safely deploy the airgun sled.
Bathymetry of the northeast corner of the Caribbean plate
Bathymetry of the northeast corner of the Caribbean plate
Helicopter view Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. You can see the bubbler system working on Louis. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. You can see the bubbler system working on Louis. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (top) and U.S. Coast Guard Cutter Healy (bottom) on the Arctic Ocean. This was during a scientific expedition to map the extended continental shelf in the Arctic Ocean.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (top) and U.S. Coast Guard Cutter Healy (bottom) on the Arctic Ocean. This was during a scientific expedition to map the extended continental shelf in the Arctic Ocean.

Tsunami waves, view to the northwest

Vertical movement of the seafloor over the 2004 Sumatra-Andaman earthquake, view to the northwest, water removed
Vertical movement of the seafloor over the 2004 Sumatra-Andaman earthquake, view to the northwest, water removed
Sonar-generated image showing underwater topography and the potential for landslides near the head of Resurrection Bay, Alaska. The terrain looks three times as steep as it occurs naturally. The arrow points to underwater landslide debris from the collapse of a fan-delta following the great Alaskan earthquake of 1964.
Sonar-generated image showing underwater topography and the potential for landslides near the head of Resurrection Bay, Alaska. The terrain looks three times as steep as it occurs naturally. The arrow points to underwater landslide debris from the collapse of a fan-delta following the great Alaskan earthquake of 1964.
Coastal and Marine Hazards and Resources Program
12201 Sunrise Valley Dr
Reston, VA 20192
United States
Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA 95060
United States
St. Petersburg Coastal and Marine Science Center
600 4th Street South
St. Petersburg, FL 33701
United States
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole, MA 02543
United States
Natural Hazards Mission Area Headquarters
12201 Sunrise Valley Dr
Reston, VA 20192
United States
Water Resources Mission Area - Headquarters
USGS Headquarters
12201 Sunrise Valley Drive
Reston, VA 20192
United States
What is marine geology?
Will California eventually fall into the ocean?
What is the difference between a tsunami and a tidal wave?
What are tsunamis?
What is it about an earthquake that causes a tsunami?
Is there a system to warn populations of an imminent occurrence of a tsunami?
What is "vog"? How is it related to sulfur dioxide (SO2) emissions?
What is the "Ring of Fire"?
Geologic activity in the ocean can cause dangerous or catastrophic events that threaten lives and critical infrastructure both at sea and on land. The USGS studies these geological events beneath the sea floor, known as marine geohazards, to provide decision makers with the information needed to mitigate risks to human communities, infrastructure, and the environment.
What are marine geohazards?
Marine geohazards, or ‘dangers in the deep’ include earthquakes, volcanic eruptions, submarine landslides, and tsunamis, as well as dissociation of gas hydrates—which can cause seafloor collapse—and oil spills or toxic seeps that affect deep sea life or change the physical characteristics of ocean environments.
Science to Address Hazards
Earthquakes, Landslides, and Tsunamis

Underwater earthquakes and landslides can generate tsunamis that cause hazards for coastal communities. USGS scientists study the subduction zone and the recent history of marine hazards and evaluate the future potential and probable impacts of such events on a regional basis. Quantifying these various hazards (e.g., earthquakes, landslides, tsunamis, and volcanoes) using geological and geophysical data, interpretations, and models improves understanding of the underlying processes of marine geohazards to assess the threats they pose. The USGS develops reliable deterministic and probabilistic estimates of the hazards that are used by engineers and policymakers to help reduce risk.
One barrier to measuring seismic risk has been the scarcity of high-resolution maps of the ocean floor. To fill these gaps, USGS scientists conduct high-resolution mapping offshore, especially near urban regions such as Southern California and the Pacific Northwest that are particularly at risk from seismic hazards. Creating three-dimensional views of the seafloor has given scientists remarkable ways to examine how a fault works, or how fluids may follow underground paths and potentially trigger submarine landslides. These landslides threaten offshore structures such as seafloor pipelines, cables, and equipment for oil and gas exploration. They can also trigger tsunamis that endanger coastal communities worldwide.
To discover a fault’s structure, scientists go to sea to collect streams of data that they turn into comprehensive underwater maps. This type of imaging, along with knowing the age of the sediment along faults and measuring other factors such as magnetics and density, can help tell the story of when the fault last ruptured or how fast it is moving. USGS incorporates these data, which have historically been challenging to collect, into earthquake models to estimate their actual hazard risk. Using high-resolution mapping and seismic technology to gather detailed seafloor data can directly impact human life and cities by improving earthquake and tsunami forecasts.
Research results are used in evaluations of earthquake risk zoning, public disaster education and preparedness, and engineering and building codes. Additionally, reassessing the threat of earthquake, tsunami, and landslide hazards to ports and nuclear power plants can directly impact facility management, emergency-management planning, and plant re-licensing.
The Atlantic and Gulf margins are heavily urbanized, support extensive port and industrial/resource facilities, and host 10 nuclear power plants. The USGS completed quantitative assessments of submarine landslides for the U.S. Atlantic coast from Maine to Florida and throughout the Gulf Region to better comprehend the risk of potential submarine landslides and tsunamis to these areas and associated infrastructure.



Gas Hydrates and Seafloor Collapse

Naturally occurring gas hydrates are ice-like combinations of water and (usually methane) gas that form in sediment below the sea floor and in areas of continuous permafrost when pressure and temperature conditions are appropriate.
In deep water marine settings where warm fluids are pumped from great depths below the seafloor for extraction of conventional oil and gas, heating of sediments near a well could lead to breakdown of gas hydrates and release gas and water. Intact gas hydrates generally strengthen marine sediments, and dissociation of gas hydrates could lead to subsidence or collapse of the seafloor near the well. Features associated with natural failure of the seafloor (landslides) have also been linked to gas hydrates in some cases. USGS scientists support submarine geohazards research through field-based surveys that refine understanding of the hydrates-slope failure association and through geotechnical studies that evaluate the response of sediments to dissociation or dissolution of gas hydrates.
Publications
Earthquake recurrence estimates for northern Caribbean faults from combinatorial optimization
Insights on gas hydrate formation and growth within an interbedded sand reservoir from well logging at the Qiongdongnan Basin, South China Sea
A scaling relationship for the width of secondary deformation around strike-slip faults
Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia
Late-Quaternary surface displacements on accretionary wedge splay faults in the Cascadia Subduction Zone: Implications for megathrust rupture
Science
Cascadia Subduction Zone Marine Geohazards
California Seafloor Mapping Program
Seafloor Faults off Southern California
Hazards: EXPRESS
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Connect
Coastal and Marine Hazards and Resources Program
12201 Sunrise Valley Dr
Reston, VA 20192
United States
Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA 95060
United States
St. Petersburg Coastal and Marine Science Center
600 4th Street South
St. Petersburg, FL 33701
United States
Woods Hole Coastal and Marine Science Center
384 Woods Hole Rd.
Woods Hole, MA 02543
United States
Natural Hazards Mission Area Headquarters
12201 Sunrise Valley Dr
Reston, VA 20192
United States
Water Resources Mission Area - Headquarters
USGS Headquarters
12201 Sunrise Valley Drive
Reston, VA 20192
United States
Multimedia
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Jumbo piston corer

Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.
Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.

Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.
News
We Make Treasure Maps: USGS Charts the Seafloor to Help Locate Critical Minerals, Precious Metals, and Other Vital Resources
Valuable Data Collected on M7.0 Earthquake Offshore Cape Mendocino, California
Seafloor Seismographs Rapidly Deployed Following Major Earthquake Offshore Northern California
Earthquake recurrence estimates for northern Caribbean faults from combinatorial optimization
Insights on gas hydrate formation and growth within an interbedded sand reservoir from well logging at the Qiongdongnan Basin, South China Sea
A scaling relationship for the width of secondary deformation around strike-slip faults
Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia
Late-Quaternary surface displacements on accretionary wedge splay faults in the Cascadia Subduction Zone: Implications for megathrust rupture
Methane seeps on the U.S. Atlantic margin: An updated inventory and interpretative framework
Modeled flooding by tsunamis and a storm versus observed extent of coral erratics on Anegada, British Virgin Islands— Further evidence for a great Caribbean earthquake six centuries ago
Crustal structure across the central Dead Sea Transform and surrounding areas: Insights into tectonic processes in continental transforms
Fast rupture of the 2009 Mw 6.9 Canal de Ballenas earthquake in the Gulf of California dynamically triggers seismicity in California
Long-term ocean observing for international capacity development around tsunami early warning
Marine paleoseismic evidence for seismic and aseismic slip along the Hayward-Rodgers Creek fault system in northern San Pablo Bay
California deepwater investigations and groundtruthing (Cal DIG) I: Fault and shallow geohazard analysis offshore Morro Bay
Cascadia Subduction Zone Marine Geohazards
California Seafloor Mapping Program
Seafloor Faults off Southern California
Hazards: EXPRESS
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Tsunami Hazards, Modeling, and the Sedimentary Record
Tsunami and Earthquake Research
Large Oil Spills
U.S. Geological Survey Gas Hydrates Project
Caribbean Tsunami and Earthquake Hazards Studies
Tracking Oil Spills: Before, During, and Decades Later
Piston and gravity core data collected during USGS cruise 2019-642-FA offshore of south-central California in support of the Bureau of Ocean Energy Management (BOEM) California Deepwater Investigations and Groundtruthing (Cal DIG I) alternative energy pro
Donated ROV vibracore and sampling data collected during Monterey Bay Aquarium Research Institute cruises in 2019 offshore of south-central California
Composite multibeam bathymetry surface and data sources of the southern Cascadia Margin offshore Oregon and northern California
Multichannel seismic-reflection and navigation data collected using SIG ELC1200 and Applied Acoustics Delta Sparkers and Geometrics GeoEel digital streamers during USGS field activity 2020-014-FA.
High-resolution multi-channel and Chirp seismic-reflection data from USGS cruise 2018-641-FA collected in south-central California in support of the Bureau of Ocean Energy Management Cal DIG I offshore alternative energy project
Reprocessed multichannel seismic-reflection (MCS) data from USGS field activity T-1-96-SC collected in San Diego Bay, California in 1996
High-resolution geophysical and geological data collected in Little Egg Inlet and offshore the southern end of Long Beach Island, NJ, during USGS Field Activities 2018-001-FA and 2018-049-FA
Multichannel minisparker, multichannel boomer, and chirp seismic-reflection data of USGS field activity 2017-612-FA collected in Puget Sound and Lake Washington in February of 2017
Chirp sub-bottom data of USGS field activity K0211PS collected in Puget Sound, Washington in April of 2011
Split-beam Echo Sounder and Navigation Data Collected Using a Simrad EK80 Wide Band Tranceiver and ES38-10 Transducer During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA.
Multichannel Seismic-Reflection and Navigation Data Collected Using Sercel GI Guns and Geometrics GeoEel Digital Streamers During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Science crew from the USGS Pacific Coastal and Marine Science Center work on deployment of seismic streamer on deck of R/V Robert Gordon Sproul. Green cable is the hydrophone streamer and a "bird" is being attached to control depth in the water.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
Looking across the back deck/stern of the R/V Robert Gordon Sproul. The wire going through the block in the A-frame leads to the CHIRP sonar fish towed in the water. Oil platforms are shown in the distance.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
On December 26th, 2004, a massive 9.1 magnitude earthquake struck off the west coast of northern Sumatra, Indonesia. The third largest earthquake ever recorded lifted the sea floor several meters, causing tsunami waves to ripple out in all directions and race across the ocean. Banda Aceh bore the brunt of the waves just 15 to 20 minutes after the earthquake.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Dr. Nora Nieminski is a research geologist and Mendenhall Fellow at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California. She is pictured here, on board Marine Vessel Bold Horizon, with a piston core sample collected from the southern Cascadia subduction zone offshore of northern California/southern Oregon.
Jumbo piston corer

Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.
Multichannel seismic-reflection profile across the Queen Charlotte-Fairweather fault, acquired aboard the R/V Norseman in August 2016. Dashed red line in enlarged section at lower right is the Queen Charlotte-Fairweather fault. m, meter; km, kilometer; ms, millisecond.

Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Dan Ebuna (University of California, Santa Cruz; left) and Jackson Currie (USGS) work on the R/V Norseman amid thick fog on Resurrection Bay. They are preparing to test equipment that will image sediment layers beneath the seafloor.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.
Mary McGann (left, USGS) and Rachel Lauer (University of Calgary) sample pore fluids from sediment cores collected aboard the Canadian Coast Guard Ship John P.

Multichannel seismic-reflection profile showing deformed and offset sediment layers below the outer continental shelf west of Sitka. The Sitka Sound fault is one of more than a dozen previously unmapped faults discovered in the July 2017 seismic-reflection data.
Multichannel seismic-reflection profile showing deformed and offset sediment layers below the outer continental shelf west of Sitka. The Sitka Sound fault is one of more than a dozen previously unmapped faults discovered in the July 2017 seismic-reflection data.
University of Washington's research vessel R/V Barnes is loaded with the USGS multichannel seismic system components GeoEel, Chirp, and boom plates.
University of Washington's research vessel R/V Barnes is loaded with the USGS multichannel seismic system components GeoEel, Chirp, and boom plates.
Seafloor offshore of Point Estero (PE) showing east (EH) and west (WH) strands of the Hosgri fault zone. Arrow points to a seafloor slope (a 12,000 year old shoreline) that has been offset by the east Hosgri strand, indicating a slip rate of about 2.6 millimeters per year.
Seafloor offshore of Point Estero (PE) showing east (EH) and west (WH) strands of the Hosgri fault zone. Arrow points to a seafloor slope (a 12,000 year old shoreline) that has been offset by the east Hosgri strand, indicating a slip rate of about 2.6 millimeters per year.
This piston corer recovers as much as 20 meters of sediment from below the seafloor, which is used to reconstruct the history of the Arctic Ocean and its sea ice.
This piston corer recovers as much as 20 meters of sediment from below the seafloor, which is used to reconstruct the history of the Arctic Ocean and its sea ice.
The airgun sled is painted orange and suspended from the A-frame. The three airguns are suspended beneath the sled. The multichannel digital streamer (yellow cable going into the water from the sled) is towed from the the weighted sled to keep it under the ice. This photo shows the number of crew required to safely deploy the airgun sled.
The airgun sled is painted orange and suspended from the A-frame. The three airguns are suspended beneath the sled. The multichannel digital streamer (yellow cable going into the water from the sled) is towed from the the weighted sled to keep it under the ice. This photo shows the number of crew required to safely deploy the airgun sled.
Bathymetry of the northeast corner of the Caribbean plate
Bathymetry of the northeast corner of the Caribbean plate
Helicopter view Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. You can see the bubbler system working on Louis. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. You can see the bubbler system working on Louis. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (left) and U.S. Coast Guard Cutter Healy (right) on the Arctic Ocean. The ships are coming together because the crews are planning to meet and learn the operations of the other ship. This was during a scientific expedition to map the Arctic seafloor.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (top) and U.S. Coast Guard Cutter Healy (bottom) on the Arctic Ocean. This was during a scientific expedition to map the extended continental shelf in the Arctic Ocean.
Helicopter view of Canadian Coast Guard Ship Louis S. St. Laurent (top) and U.S. Coast Guard Cutter Healy (bottom) on the Arctic Ocean. This was during a scientific expedition to map the extended continental shelf in the Arctic Ocean.

Tsunami waves, view to the northwest

Vertical movement of the seafloor over the 2004 Sumatra-Andaman earthquake, view to the northwest, water removed
Vertical movement of the seafloor over the 2004 Sumatra-Andaman earthquake, view to the northwest, water removed
Sonar-generated image showing underwater topography and the potential for landslides near the head of Resurrection Bay, Alaska. The terrain looks three times as steep as it occurs naturally. The arrow points to underwater landslide debris from the collapse of a fan-delta following the great Alaskan earthquake of 1964.
Sonar-generated image showing underwater topography and the potential for landslides near the head of Resurrection Bay, Alaska. The terrain looks three times as steep as it occurs naturally. The arrow points to underwater landslide debris from the collapse of a fan-delta following the great Alaskan earthquake of 1964.
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Water Resources Mission Area - Headquarters
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