{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

4-OcFA10-PhysiogrWEB - Physiography = Bathymetry the study...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 2
Continental Margins: Active Margin vs. Passive Margin Active Margin:
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern