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underwater reconnaissance: geophysical methods of underwater survey include (1) a proton magnetometer towed behind a survey vessel, so as to detect iron and steel objects which distort the earth's magnetic field; (2) sidescan sonar that transmits sound waves in a fan-shaped beam to produce a graphic image of surface features on the sea-bed; (3) a sub-bottom profiler that emits sound pulses which bounce back from features and objects buried beneath the sea floor.
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geophysical methods of underwater survey include (1) a proton magnetometer towed behind a survey vessel, so as to detect iron and steel objects which distort the earth's magnetic field; (2) sidescan sonar that transmits sound waves in a fan-shaped beam to produce a graphic image of surface features on the sea-bed; (3) a sub-bottom profiler that emits sound pulses which bounce back from features and objects buried beneath the sea floor.
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<html>Sponsor: <a href="http://www.kqzyfj.com/click-1205615-10860217" target="_blank" onmouseover="window.status='http://www.shop.com';return true;" onmouseout="window.status=' ';return true;">Motives Cosmetics - Homepage</a><img src="http://www.lduhtrp.net/image-1205615-10860217" width="1" height="1" border="0"/></html>
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[[Category: Anthropology]]
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[[Category: Archaeology]]
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Latest revision as of 12:18, 10 September 2019

geophysical methods of underwater survey include (1) a proton magnetometer towed behind a survey vessel, so as to detect iron and steel objects which distort the earth's magnetic field; (2) sidescan sonar that transmits sound waves in a fan-shaped beam to produce a graphic image of surface features on the sea-bed; (3) a sub-bottom profiler that emits sound pulses which bounce back from features and objects buried beneath the sea floor.

Sponsor: Motives Cosmetics - Homepage