4-OcFA10-PhysiogrWEB

4-OcFA10-PhysiogrWEB - Physiography = Bathymetry the study of the shape and contours of the ocean basins Methods-Depth soundings-Echo soundings

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Physiography = Bathymetry : the study of the shape and contours of the ocean basins Methods -Depth soundings -Echo soundings Sends a sound (ping) signal to the seafloor Records the time of return, Longer return time = deeper water Potential problems Speed of sound varies with T, P and salt Need to know surface location exactly Difficulties with steep terrain Records a narrow track (line) -Multibeam Echosounding Uses many beams and multiple ‘frequencies” (120) Fans out over the seafloor Return specific to each beam Produces swath maps -Seismic Profiling Can see into layers below the seafloor -Satellite Altimetry Satellites can not “see” through the ocean water Sea surface reflects the shape of the seafloor due to gravitational attraction Highs over ridges, lows over trenches Map the surface of the ocean very accurately (m scale) Use repeat measurements to eliminate effects of waves, tide
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Hypsographic Curve: Distribution of Elevations and Depths on Earth 70% of earth’s surface below sea level Highest point: Mt Everest (9 km) Lowest point: Mariana Trench (11 km) Overall average = 2440 mbsl Ave. depth of ocean = 3794 mbsl Ave. elevation of land = 840 m
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Continental Margins: Active Margin vs. Passive Margin Active Margin:
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This note was uploaded on 12/04/2011 for the course OCE 1001 taught by Professor Smith during the Fall '08 term at University of Florida.

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4-OcFA10-PhysiogrWEB - Physiography = Bathymetry the study of the shape and contours of the ocean basins Methods-Depth soundings-Echo soundings

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