Figure F9. A. Locations of the six multichannel seismic profiles near proposed Site IBM-3C. The intersection of d–d′ with e–e′ is thought to be the best site for drilling. B. Ar-Ar and K-Ar ages (Ma) of dredged samples near proposed Site IBM-3C (Ishizuka et al., 2003b). Rear-arc seamounts northeast–west of the drilling area are older than the seamounts on the southwest–east side, and thus the drilling point is chosen as the intersecting point closest to the older volcanoes, having lower heat flow and cooler temperatures.
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