Figure 4

Interpreted section compiled from time-migrated and PSDM profiles and detailed bathymetry map (Bayonnaise Knoll caldera). (a) Interpreted section compiled from time-migrated and prestack depth-migrated (PSDM) profiles in the Bayonnaise Knoll caldera with the model of hydrothermal fluid migration. The green horizontal bar shows the high-magnetization zone over 4 A/m, as projected from mapping results by Honsho et al. (2010). (b) Detailed bathymetry map around the Bayonnaise Knoll caldera. The red line shows our multi-channel seismic reflection (MCS) survey line. Dotted lines represent the fault inferred from the present study results and bathymetric lineation features. Yellow arrows indicate the knoll chain in the center of the Bayonnaise Knoll caldera that was described in Honsho et al. (2010). CDP, common depth point.