. Collected reprints, Essa Institute for Oceanography. Oceanography 6244 BURNS AND GRIM. Fig. 3. Correlation of magnetic anomalies along profiles A-A', B-B', C-C, and D-D'. They are identical to those shown in Figure 2 but are arranged differently. Each profile is north of the one below it. Since A-A' crosses over C-C, as shown in Figure 1, it is split. There is a vertical offset of 200 gammas between profiles. The scales for the eastern part of A-A', C-C, the western part of A-A', and B-B' are obtained by subtracting 200, 400, 600, and 800 gammas, respectively, from the scale sh
. Collected reprints, Essa Institute for Oceanography. Oceanography 6244 BURNS AND GRIM. Fig. 3. Correlation of magnetic anomalies along profiles A-A', B-B', C-C, and D-D'. They are identical to those shown in Figure 2 but are arranged differently. Each profile is north of the one below it. Since A-A' crosses over C-C, as shown in Figure 1, it is split. There is a vertical offset of 200 gammas between profiles. The scales for the eastern part of A-A', C-C, the western part of A-A', and B-B' are obtained by subtracting 200, 400, 600, and 800 gammas, respectively, from the scale shown, which is for D-D'. general trend, there appear to be smaller scale variations that have sharp peaks and shallow troughs. One of the first questions to be asked is whether the implied regional gradient is real. The alternative to a regional gradient would be to assume a regional mean and to examine the observed values in terms of such effects as erosion-sedimentation, lateral variations of ther- mal conductivity, and secondary heat sources. The mean value of the heat flow measurements along the section ( /xcal cm"2 sec"1) is com- parable to that estimated for the eastern part of the continental rise ( jucal cm"2 sec"1), but the contrasts along the section are such that only an extremely arbitrary assignment of the effects mentioned above can force a regional mean into any approximation of the observed values. On the other hand, if the regional gradient exists, the observed values of heat flow may be examined in terms of departure from the re- gional field. The basic constraints on any ap- proximation of a regional gradient along section A -A' are (1) the observed values of heat flow along the section, (2) that the eastern end should be comparable to the regional mean observed over the eastern part of the con- tinental rise ( jucal cm"2 sec"1), and (3) that the western end should not be unrealisti- cally less than a representati
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