Subduction Zone

The USGS Law of the Sea project helps to determine the outer limits of the extended continental shelf (ECS) of the United States. The ECS is that portion of the continental shelf beyond 200 nautical miles. It is an important maritime zone that holds many resources and vital habitats for marine life. Its size may exceed one million square kilometers, encompassing areas in the Arctic, Atlantic...

The U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center in Woods Hole, Massachusetts, is one of three centers serving the mission of the USGS Coastal/Marine Hazards and Resources Program (CMHRP). Since its authorization by Congress in 1962, the CMHRP has served as the primary Federal program for marine geology and physical science research.

For our project, the R/V Marcus G. Langseth is towing a 12-kilometer-long hydrophone streamer that records sound reflected from deep below the seafloor , which is helping scientists image the structure of the Cascadia Subduction Zone and megathrust fault. The streamer records data as a function of the time it takes for sound to travel from the ship’s source down to “reflectors”

In the Field; Land, Sea, and Air Woods Hole Coastal and Marine Science Center scientists and staff study coastal and ocean resources and processes from the land, sea, and air, to shorelines and estuaries to the continental shelf, deep sea, lake floor, river bottoms and shallow subsurfaces environments. We have implemented new safety and fieldwork processes to maintain social distancing to ensure...

The Sea Floor Mapping Group (SFMG) is a core capability at the Woods Hole Coastal & Marine Science Center (WHCMSC) that provides support for coastal, lacustrine and marine geologic research. The staff has a wide-range of expertise and is responsible for geophysical and sampling data acquisition, processing, interpretation and publication, logistics, design, and research and development. SFMG has...

Puerto Rico and the Virgin Islands are located at an active plate boundary between the North American plate and the northeast corner of the Caribbean plate. Plate movements have caused large magnitude earthquakes and devastating tsunamis. The USGS has an ongoing program to identify and map the faults in this region using various geophysical and geological methods in order to estimate the location...