Figure F10. Wide-angle seismic profile across Izu arc with P-wave velocities for upper, middle, and lower crust (greens) and for mantle (blues) (Suyehiro et al., 1996). ODP and IODP sites are projected onto this line of section. Site U1437 is the first site drilled in the broad region of long-lived rear-arc seamount chains (shown on Fig. F4). ODP Site 791 is also in the rear arc, but it is a narrow, young, active Sumisu rift (see Fig. F4). Site U1436 and ODP Sites 792, 793, and 786 are in the modern fore arc. MORB = mid-ocean-ridge basalt.
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