Figure F1. A. Uninterpreted (top) and interpreted (bottom) STEEP09 seismic line, showing mappable horizons through the Bering shelf region. Targets for Site U1421 include Horizon H1 and Horizon H2, which marks the cessation of movement on the Pamplona Zone structures beneath the Bering Trough. Colored lines (H1–H5) are regional horizons interpreted throughout the study area. Black horizons (A–F) are interpreted locally to define glacial depositional sequences in the upper 2 s of the record. VE = vertical exaggeration assuming 1500 m/s sound velocity. BT1–BT4 = fault structures. B. Perspective view of the Bering Trough region, showing locations of the trough relative to active structures of the Pamplona Zone. Modified from Worthington et al. (2010). YAK-NA = Yakutat-North America.
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