Bathymetry: Mapping the Sea Floor

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Presentation transcript:

Bathymetry: Mapping the Sea Floor So why do we map the sea floor? What do we want to know (2 general things)? 1

2

Multi-beam SONAR Swath Click on this image to run the animation. http://www.nauticalcharts.noaa.gov/staff/docs/Multibeam_720@24fps-300Kbps.mov The swath of the beam is equal to 3 times the depth being mapped. E.g., if you are multi-beam mapping at 1,000 feet deep, the swath of soundings would be 3,000 feet wide. http://www.nauticalcharts.noaa.gov/staff/docs/Multibeam_720@24fps-300Kbps.mov 4

Deploying Side-Scan SONAR 5

Multi-Beam SONAR 6

Seamounts off New England Seamounts off New England

Seamounts off New England False color map

Bathymetric contour map of Davidson Seamount, showing dive tracks. 9

Hudson Canyon 10

Hudson Valley, NY 11

Alderdice Bank Gulf of Mexico 12

Galapagos Rift Spreading Center 13

Mid-Ocean Ridge System EARTH’S LONGEST MOUNTAIN RANGE (35,000 MILES) 2/3 of Earth’s surface formed at mid-ocean ridges 14

Side-Scan SONAR Ring of Fire ’03 Expedition 15

MATCH THE 3-D BATHYMETRIC MAP with Its raw data A: Hudson Canyon B: Blake Ridge C: Loihi Seamount

Hudson Canyon

Blake Ridge

Loihi Volcano Bathymetric map of Hawaii’s youngest volcano off the southeastern coast of the Big Island of Hawaii 19

Loihi Seamount 20