Figure F9. Trench-parallel fore-arc seismic sections from Kodaira et al. (2010). A. P-wave velocity image. Shaded area = poorly resolved area identified by the checkerboard test. B. Reflectivity image superimposed on a layered structure constructed from velocity and reflectivity images. Unit A must consist of sediment, volcaniclastics, and volcanic rocks (Kodaira et al., 2007); Unit B is likely to consist of felsic-to-intermediate plutonic rocks; Unit C is mafic plutonic rocks and amphibolites; Unit D may be pyroxenite; and Unit E is mantle peridotite. The wide-angle ocean-bottom seismometer profile is the near-north–south profile in Figure F1. C. P-wave velocity model. Proposed Sites BON-1A and BON-2A are located ~150 km along the section and ~30 km to the east.
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