Figure 1.
Actively spreading ridge segments (red) and transform faults/fracture zones (black); projections of subducted Chile Ridge structures (dashed black lines). Purple triangles are arc volcanoes; note gap in volcanic arc between Hudson and Lautaro. Relative convergence velocities from Spitzak and DeMets (1996a, 1996b) and Wang et al. (2007). Heavy dashed gray lines mark study area shown in inset, lower left: Chile Ridge Subduction Project station sites (squares). Slab window boundaries predicted from marine paleomagnetic data, subduction rates, and slab dip marked by heavy blue lines (Murdie and Russo, 1999). Inset, lower right: study region. FZ—fault zone; LOFZ—Liquiñe-Ofqui fault zone.