MAPPING TECHNOLOGY NOTES

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Presentation transcript:

MAPPING TECHNOLOGY NOTES

WEIGHTED LINE Oldest method in which a weighted line is lowered into the ocean until it touches the ocean floor.

ECHO SOUNDER Older method in which scientists bounce a beam of sound waves off the ocean bottom to measure water depth.

SONAR MULTI-BEAM Ships send out many beams to collect data on a wide swath of the seafloor, rather than a single line.

SEISMIC PROFILING Uses powerful shock waves to map subsurface rock structures.

SEA-SURFACE ALTIMETRY Sends a radar beam from a satellite to measure the height of the sea surface, which closely reflects the shape of the sea floor. Higher elevations, like mountains, have more mass so their gravity attracts a water bulge up to 30 m high. Troughs & trenches can form depressions up to 60 m deep.

SEA-SURFACE ALTIMETRY