. The Earth beneath the sea : History . R â 1--f" I 1 I *>Hf>tH<tMt/flJM>tf> iVM/.vf^JO^VIAVpVMii^y nnniE «/iU?,^,M/ify^ ^r>|N|*«*^ft(w^v>^^ "f''vi"t"r" ""'^ Ml i?'!*" 'H-^ r I I I I 11 I I pTO^^K^csf; ::=c i ⢠⢠â I â I - "«ââ^ 1 second IP Fig. 5. Seismic records showing critical angle reflections for Rn- Rm arrivals are from base of low-velocity sediments. Water depth = km. Thickness of low-velocity sediments ~ 4 km. portions of the G2 lines are observed as straight lines indicates that at some depth below the 2-3 in
. The Earth beneath the sea : History . R â 1--f" I 1 I *>Hf>tH<tMt/flJM>tf> iVM/.vf^JO^VIAVpVMii^y nnniE «/iU?,^,M/ify^ ^r>|N|*«*^ft(w^v>^^ "f''vi"t"r" ""'^ Ml i?'!*" 'H-^ r I I I I 11 I I pTO^^K^csf; ::=c i ⢠⢠â I â I - "«ââ^ 1 second IP Fig. 5. Seismic records showing critical angle reflections for Rn- Rm arrivals are from base of low-velocity sediments. Water depth = km. Thickness of low-velocity sediments ~ 4 km. portions of the G2 lines are observed as straight lines indicates that at some depth below the 2-3 interface, the velocity becomes constant or nearly so. The 2-3 interface is judged to be a discontinuity with the higher velocity below on the basis of the observation of a critical angle for reflections from it.
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
