. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 684 B. G. BASSINGER. 170° 168° 166° 164° 162° 160° 158° 156° Fig. 1. Index map showing geologic trends and regional magnetic field. a line spacing of acceptable values of 10 km or less. Magnetic data obtained on the project were not corrected for temporal variations. A com- parison of adjacent tracklines revealed that neither daily nor secular variations of the mag- netic field effected the observed values enough to justify a correction. Nevertheles
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 684 B. G. BASSINGER. 170° 168° 166° 164° 162° 160° 158° 156° Fig. 1. Index map showing geologic trends and regional magnetic field. a line spacing of acceptable values of 10 km or less. Magnetic data obtained on the project were not corrected for temporal variations. A com- parison of adjacent tracklines revealed that neither daily nor secular variations of the mag- netic field effected the observed values enough to justify a correction. Nevertheless, all dis- crepancies between observed magnetic values were smoothed in the contouring process. Anomaly map. A regional gradient of the total magnetic field intensity was determined from Hydrographic Office Chart 1703 (1955). The chart was corrected to 1962 and adjusted to the observed magnetic values for conformity. No adjustment was required at 68°N, but, at 71 °N, these data indicate that the residual field is 400 gammas lower than the field shown by the world chart. This discrepancy probably reflects a lack of control in the compilation of the 1955 world chart. Two iso-gamma lines that represent the mag- nitude and direction of the earth's magnetic field are shown in Figure 1. A linear interpola- tion between the lines defines the plane used to determine residual values. Shaded areas of the residual map (Figure 2) represent zones where observed values exceeded the regional field,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, En
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