Figure F1. Tectonic setting (inset) and regional seafloor geology (main diagram) of the eastern Manus Basin, site of Leg 193. Distributed extension between the Djaul and Weitin transform faults, accommodated by northeast-trending normal faults (thin lines) in the eastern Manus Basin rift zone, matches focused extension associated with backarc spreading zones (thick lines of inset) farther west. An east-west series of neovolcanic edifices links the seismically active ends of the Djaul and Weitin faults. The PACMANUS hydrothermal field lies at the crest of a linear edifice dominated by dacite. NB = New Britain (adapted from Binns et al., 1995).