Ocean Floor Features. http://ga.water.usgs.gov/edu/waterdistribution.html. Source: Nace, U.S. Geological Survey, 1967 . East Coast of the U.S. How are the ocean floor features found?. SONAR. So und Na vigation R ange
Source: Nace, U.S. Geological Survey, 1967
the ocean floor features found?
The echo sounder calculates water depth by measuring time between emission of a sound signal directed toward the ocean floor and the return echo.
The shelf break marks a distinct change in the slope of the sea floor from the flat continental shelf to the steep sea floor of the continental slope.
HUDSON CANYON - First discovered in 1864
Canyon leading into Monterey Bay
The abyssal plain is the flat, almost level area of the deep ocean basin.
Coast of central California
Same area, different perspective
A volcanic mountain found on an ocean basin. It is not a result of subduction or formed at the mid-ocean ridge. Possibly an island that has since eroded.
K. Stocks. 2003. Map of Sampled Seamounts. SeamountsOnline: an online information system for seamount biology. World Wide Web electronic publication. http://seamounts.sdsc.edu.
Underwater mountain chain that rises from the ocean basins. Created by rising magma.
Africa / Europe
Example of the Mid-Atlantic Ridge
A system of cracks in Earth’s crust through which molten material rises. Rift zones are found in the middle of the mid-ocean ridges. Strange animal life and unique geologic structures have been found here.
Volcanic ridge on zero-age crust, note small and larger volcanic cones. See cratered volcano at the top? The narrow, linear, bright features in the rest of the image are fault scarps. Uniform gray areas are sediment accumulating.
A deep trough on the ocean floor where oceanic crust is forced below continental or other oceanic crust.