Oceanic crustal structure—Mid-Atlantic Ridge at 45° N |
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| Authors: | C M R Fowler C E Keen |
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| Institution: | Institut für Geophysik, ETH-Honggerberg, CH-8093 Zurich, Switzerland;Atlantic Geoscience Centre, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada |
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| Abstract: | Summary. We present a velocity—depth model for the crust beneath the Mid-Atlantic Ridge at 45° N which is derived from a comparison of waveforms corresponding to observed and synthetic seismograms. The model which best fits the observations includes a high-velocity layer at the base of the crust (layer 3B) and a velocity gradient in the upper mantle. These results are in agreement with other recent seismic studies on the Mid-Atlantic Ridge and indicate that the velocity structure is more complex than that obtained from travel-time analysis. There is no evidence for a low-velocity zone at the base of the crust. |
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