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Earth, Planets and Space
Figure 12 | Earth, Planets and Space

Figure 12

From: A new leveling method without the direct use of crossover data and its application in marine magnetic surveys: weighted spatial averaging and temporal filtering

Figure 12

Histograms of crossover differences (CODs) from the Minami-Hiyoshi Seamount survey and comparison with Chichijima Observatory (CBI) data. (A) Histograms of 493 CODs from magnetic anomaly data of the 2001 Minami-Hiyoshi Seamount survey for the weight distance d 0 of 0.1 km. The CODs get closer to 0 nT, and their standard deviation (SD) decreases with a decrease in the filtering width 2t 0 from the bottom to the top. (B) Comparison of the total magnetic intensity 1-min values at CBI and leveling corrections. An approximate value of 41,000 nT is subtracted from the 1-min values, and the subtracted values (black) are compared with leveling corrections along the track lines of the HS010808 cruise. Shorter period components appear with a decrease in the filtering width 2t 0. The weight distance d 0 is 0.1 km for all the cases. (C) Histograms of 493 CODs from magnetic anomaly data of the 2001 Minami-Hiyoshi Seamount survey for the filtering width 2t 0 of 3 h. The CODs get closer to 0 nT, and their SD decreases with a decrease in the weight distance d 0 from the bottom to the top.

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