Plate 3 Vertical slices through the velocity structure of Iceland, ICECRTb. Slices are parallel and perpendicular to the main Eastern Neovolcanic Zone. Each slice is shown twice. (b) and (d) show absolute velocity variations which illustrate both the velocity anomalies and crustal thickness variations. Purple colors correspond to mantle velocities. Note the thick crust in central Iceland and the necking to the NW before the thicker crust of the Westernfjords. (c) and (f) are relative velocity anomalies along the same lines and clearly show the communication between the lower crustal low velocities and the horizontal upper crustal low-velocity anomaly which extends up and down much of the ridge.

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