Remarkable new images of the internal structure of oceanic crust have been recorded from a two-ship multichannel seismic survey in the western North Atlantic. Results include strong, planar dipping reflectors in the lower crust, evidence of whole-crustal failure generating reflectors from the top of the basement to the Moho, and banded layering in the lower crust and in some places in the upper mantle. Anomalous crust in the Blake Spur Fracture Zone is documented from both normal incidence and wide-angle seismic profiles The internal structure of the crust records the magmatic and tectonic history of the crust as it was generated at, and then moved away from, the spreading center.

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