Characterizing the Galicia Bank-Southern Iberia Abyssal Plain rifted margin segment boundary using multichannel seismic and ocean bottom seismometer data

[1] We present multichannel seismic reflection and ocean bottom seismometer reflection/refraction data from ISE-9, a margin-parallel, north–south oriented profile ∼200 km west of the Portuguese coast. ISE-9 images the boundary between two distinct segments of the Iberia nonvolcanic rifted margin: Galicia Bank (GB) and the Southern Iberia Abyssal Plain (SIAP). The bathymetric contrast between GB (2 km depth) and SIAP (4–5 km depth) spans only 25 km. The crustal thickness transition, however, spans 137 km, from 13–18 km thick beneath GB to