. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 700 800 900 1000 (a) DEPTH IN FA THOMS (c^aoo FM/SEC) 10. mmi-^j^. â ^â ix^immM D- , , i_ « if -â¢- â DIRECT -WATER ARRIVAL BOTTOM RErLECTION - â 20 30 105 FEET Fig. 21. (a) Crescent-form echo sequences from a rough bottom on the continental rise, western North Atlantic Ocean, (b) Sub-bottom crescent-form echo sequences from Vineyard Sound, Massacliusetts. After multiple reflections and side echoes have been identified and slope corrections made, the jjrimary echo sequences are plotted on a structure profile. If velocity
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 700 800 900 1000 (a) DEPTH IN FA THOMS (c^aoo FM/SEC) 10. mmi-^j^. â ^â ix^immM D- , , i_ « if -â¢- â DIRECT -WATER ARRIVAL BOTTOM RErLECTION - â 20 30 105 FEET Fig. 21. (a) Crescent-form echo sequences from a rough bottom on the continental rise, western North Atlantic Ocean, (b) Sub-bottom crescent-form echo sequences from Vineyard Sound, Massacliusetts. After multiple reflections and side echoes have been identified and slope corrections made, the jjrimary echo sequences are plotted on a structure profile. If velocity information is available it may be worthwhile to convert travel times to distances at this point. However, the common practice has been to preserve the travel times through this step. With either choice, reflecting horizons may be traced and charted by studying the whole pattern of profiles. Model-making has proven helpful in several investigations. Fig. 11 from the reconnaissance survey of the northwestern approach to the Strait of Messina is an Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
