related to fracture with associated volcanism. 
Oceanographic Office surveys which illustrate that anomalies of 
varying amplitude are to be found over other features of the New 
England-Bermuda chain include a shipboard marine survey of the 
seamounts from Kelvin southeast to approximately 34°25'N, 56°40'w 
(Walczak, 1964). In addition, aeromagnetic surveys have been 
conducted of an area Seger of Bermuda (Davis and Heckelman, 1964) 
and of Plantagenet Bank (Young and Kontis, 1964). 
A. Zone One Anomalies 
Since the shape of the seamount contours (fig. 3) resemble 
their respective magnetic contours (fig. 4) it is likely that these 
seamounts represent the general configuration of the volcanic source 
material. To investigate this further, a two-dimensional model 
computation (Heirtzler et al, 1962) was applied to Kelvin Seamount. 
The use of a two-dimensional technique implies that the 
length of the anomaly being considered is much greater than its 
width. Since the length-to-width ratio of the Kelvin anomaly is 
only about 3:1, some error is introduced. According to Press and 
Ewing (1952) however, the error is small. 
Figure 9 shows the best fit obtained from matching observed 
profiles (F,, Z,, and Hp) across the peak of Kelvin seamount with 
R? 
profiles derived from a theoretical source body. The trapezoidal 
model is essentially a cross section of the observed topography, 
