Variations in crustal structure on the East Pacific Rise crest: A travel time inversion approach |
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| Authors: | BLN Kennett AWH Bunch JA Orcutt RW Raitt |
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| Institution: | Department of Geodesy and Geophysics, University of Cambridge, Cambridge CB3 0EZGreat Britain;Scripps Institution of Oceanography, La Jolla, Calif. 92093USA |
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| Abstract: | Systematic travel time inversion techniques have been applied to first arrival travel times from a number of seismic refraction profiles on the crest and flanks of the East Pacific Rise to generate bounds on the possible velocity-depth distributions. The greatest variability in structure occurs within 5 Myr of the rise crest. The generally similar character of the bounds on the velocity distributions for ages greater than 5 Myr indicates that the most rapid aging occurs within 5 Myr of the crest, though the mantle velocity increases systematically with age. The nature of the bounds on the velocity distribution for the range of velocities associated with layer 3 requires that the velocity distribution within layer 3 increase with depth. |
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