. The Earth beneath the sea : History . F IS 20 P = 5" = ^' = ;' Vertical Exoggeralion = 10^ 100 â 50 -100 20 25 400 DEDUCED STRUCTURE SECTION (b) (with assumed sedimentary layer) Fig. 26. Mendocino Escarpment. (After Talwani et al., 1959.) D. Mendocino Escarpment A mass distribution which accounts for the observed gravity anomaly over the Mendocino Escarpment has been given by Talwani et al. (1959). Fig. 26 shows the crustal structure deduced assuming a sedimentary layer as shown and assuming that the residual anomaly is all due to the fluctuations of the M- di


. The Earth beneath the sea : History . F IS 20 P = 5" = ^' = ;' Vertical Exoggeralion = 10^ 100 â 50 -100 20 25 400 DEDUCED STRUCTURE SECTION (b) (with assumed sedimentary layer) Fig. 26. Mendocino Escarpment. (After Talwani et al., 1959.) D. Mendocino Escarpment A mass distribution which accounts for the observed gravity anomaly over the Mendocino Escarpment has been given by Talwani et al. (1959). Fig. 26 shows the crustal structure deduced assuming a sedimentary layer as shown and assuming that the residual anomaly is all due to the fluctuations of the M- discontinuity. As this section is improbable on geological and seismic grounds, a solution of the type shown above for the Mid-Atlantic Ridge, a low density mass within the crust, would seem more likely. E. Ocean Trenches The discovery by Veiling Meinesz of the belt of large negative-gravity anomalies associated with the oceanic trenches is one of the greatest discoveries of contemporary geology and geophysics. Since their discovery, many geo-


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