The area of seismic imaging is shown by the dashed box. The crustal legs of the Pn paths are situated well away from the axis of the rise, thus avoiding the complicated and attenuating structure of the crustal magmatic system. Results Figure 2. Horizontal slice at 7 km depth of a tomographic image of Pn delay times. The region shown corresponds to the area with a good population of crossing rays.
Heavy lines indicate location of the rise axis.
Therefore, most of the velocity anomaly is likely due to melt. Our results are not compatible with models in which the OSC occurs above a region of reduced melt supply, the melt supply beneath the OSC is discontinuous and overlapping, or melt is supplied to the overlapping limbs from distal sources along each ridge segment.