B a thyme trie contour charts were constructed on the same projection 

 using a contour interval of 100 fathoms (figures 5 and 7). 



No corrections were made to any of the magnetic data for 

 temporal variations of the earth's magnetic field. 



Because geomagnetic and bathymetric data were collected simul- 

 taneously in the two survey areas, bathymetric and magnetic charts 

 may be used for direct comparison of the data. No sound velocity or 

 other corrections have been made to the bathymetric data. 



IV. SURVEY RESULTS 



Survey areas "A" and "B" (figure 1) have a total combined area 

 of 32,500 square nautical miles. The larger area, "A", lying east 

 of the Kamchatka Peninsula, contains 25,900 square nautical miles. The 

 smaller area, "B", adjoining the southwest corner of "A", contains 

 6,600 square nautical miles. 



The area "A" total magnetic intensity contour chart (figure 4) 

 shows broad magnetic anomalies associated with the bathymetric 

 features (figure 5) east of an imaginary diagonal line drawn from 

 latitute 53°N. ; longitude 160°10'E. to latitude 56°N. ; longitude 

 163°30'E. West of this line the anomalies become very steep with 

 relatively high amplitudes. These anomalies occur on or near the 

 edge of the continental shelf where the slope drops sharply down to 

 1500-2000 fathoms. The steep anomalies end abruptly south of Cape 

 Kroznotzky then reappear to the north of the cape. 



