Fig. 5

Analysis x (bow) and z (downward) components of observed magnetic anomaly along the 6K#1331 track (reanalyzed after Fujii et al. 2016a). From top to bottom: observed (red line) and synthetic (blue line) magnetic anomaly intensity, magnetization, phase, vehicle altitude, and seafloor/vehicle geometry. Black and gray circles are those with high coherency of > 0.5 and from 0.3 to 0.5 on both the x and z components, respectively. The locations of the Yokoniwa hydrothermal field and collected basaltic rock samples are shown in the bottom figure. Magnetic and physical properties for lava samples of 1331R01, 1331R02, 1331R03, 1331R04, 1331R06, and 1331R07 are shown in Table 1