. The Earth beneath the sea : History . DIRECT WATER ARRIVAL BOTTOM SURFACE MULTIPLE REFLECTIONS SUB-BOTTOM aaa -^' .'»..«iWbA 'â <-^ r REFLECTION BOTTOM SURFACE , MULTIPLES r OF THE SUB-BOTTOM REFLECTION Fig. 20. Mult ii)le-bottoin and siih-hottom in Vineyard Sound, Massachusetts. apparent sub-bottom echoes (Fig. 21b). The latter record was taken in Vine- yard Sound, Massachusetts, by the writer and others. At the time we did not j prove that the crescent echo sequences came from sub-bottom reflectors, but j we saw large numbers similar to those shown here, none of which ros
. The Earth beneath the sea : History . DIRECT WATER ARRIVAL BOTTOM SURFACE MULTIPLE REFLECTIONS SUB-BOTTOM aaa -^' .'»..«iWbA 'â <-^ r REFLECTION BOTTOM SURFACE , MULTIPLES r OF THE SUB-BOTTOM REFLECTION Fig. 20. Mult ii)le-bottoin and siih-hottom in Vineyard Sound, Massachusetts. apparent sub-bottom echoes (Fig. 21b). The latter record was taken in Vine- yard Sound, Massachusetts, by the writer and others. At the time we did not j prove that the crescent echo sequences came from sub-bottom reflectors, but j we saw large numbers similar to those shown here, none of which rose above the bottom echo. This fact suggests that the reflectors are sub-bottom, possibly \ glacial boulders, which are w(;ll known on land nearby. Sloping echo sequences recpiire individual inter])retation before a structure- profile section can be interpreted geologically. The echo-sounding literature covers extensively the inter])retation of single echo sequences (for a review, see Elmendorf and Heezen, 1957). Thus, sloping echo sequences known from other control to have been recorded exactly normal to the strike of a slope can
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
