. The Earth beneath the sea : History . 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
. The Earth beneath the sea : History . 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 example.
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
