Abstract
Three-dimensional images of crustal seismic structure beneath the East Pacific Rise show pronounced axial heterogeneity over distances of a few kilometres. A linear high-velocity anomaly, approximately 1–2 km in width and restricted to the uppermost 1 km of the crust, is centred on the rise axis. An axial low-velocity anomaly at depths of 1–3 km varies in amplitude along the axis, consistent with a zone of higher crustal temperatures midway between two discontinuities in the morphology of the rise axis. This apparent thermal segmentation along axis is consistent with injection of mantle-derived melt midway along a locally linear, 12-km-long segment of the rise.
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References
Francheteau, J. & Ballard, R. D. Earth planet Sci. Lett. 64, 93–116 (1983).
Schouten, H. & White, R. S. Geology 5, 175–179 (1980).
Schouten, H. & Klitgord, K. D. Earth planet Sci. Lett. 59, 255–266 (1982).
Macdonald, K., Sempere, J-C. & Fox, P. J. J. geophys. Res. 89, 6049–6069 (1984).
Purdy, G. M. & Detrick, R. S. J. geophys. Res. 91, 3739–3762 (1986).
Detrick, R. S. et al. Nature 326, 35–41 (1987).
Thompson, B., Bryan, B., Ballard, R., Hanuro, K. & Melson, W. Nature 310, 429–433 (1985).
Langmuir, C. H., Bender, J. F. & Batiza, R. Nature 322, 422–429 (1986).
Whitehead, J. A., Dick, H. J. B. & Schouten, H. Nature 312, 146–148 (1984).
Schouten, H., Klitgord, K. D. & Whitehead, J. A. Nature 317, 225–229 (1985).
Crane, K. Earth planet. Sci. Lett. 72, 405–414 (1985).
Macdonald, K. C. et al. Nature 335, 217–225 (1988).
Batiza, R. & Margolis, S. H. Nature 320, 439–441 (1986).
Klitgord, K. D. & Mammerickx, J. J. geophys. Res. 87, 6725–6750 (1982).
Mocdonald, K. C. & Fox, P. J. Earth planet. Sci. Lett. 88, 119–131 (1988).
Herron, T. J., Ludwig, T. J., Stoffa, P. L., Kan, T. K. & Buhl, P. J. geophys. Res. 83, 798–804 (1978).
Orcutt, J. A., Dennett, B., Dorman, L. & Prothero, W. Nature 256, 475–476 (1975).
Rosendahl, B. R. et al. J. geophys. Res. 81, 5244–5304 (1976).
Lewis, B. T. R. & Garmany, J. D. J. geophys. Res. 87, 8417–8425 (1982).
McClain, J. S., Orcutt, J. A. & Burnett, M. J. geophys. Res. 90, 8627–8639 (1985).
Harding, A. J. et al. J. geophys. Res. 94, 12163–12196 (1989).
Burnett, M. S., Caress, D. W. & Orcutt, J. A. Nature 339, 206–208 (1989).
Caress, D. W., Burnett, M. S. & Orcutt, J. A. J. geophys. Res. (in the press).
Vera, E. E. et al. J. geophys. Res. (in the press).
Mutter, J. C. et al. Nature 336, 156–158 (1988).
Kent, G. M., Harding, A. J. & Orcutt, J. A. Nature 344, 650–653 (1990).
Creager, K. C. & Dorman, L. M. J. geophys. Res. 87, 8379–8388 (1982).
Nishimura, C. E. & Forsyth, D. W. Mar. geophys. Res. 9, 333–352 (1988).
Stewart, W. K. Proc. 7th Int. Conf. Offshore Mechanics Arctic Eng. Vol. 6 (eds Chung, J. S. & Angelides, D. C.) 61–71 (Am. Soc. mech. Eng., New York, 1988).
Rothman, D. H. Geophysics 51, 332–346 (1986).
Alien, R. Bull, seism. Soc. Am. 72, S225–S242 (1982).
Thurber, C. H. J. geophys. Res. 88, 8226–8236 (1983).
Um, J. & Thurber, C. Bull. seism. Soc. Am. 77, 972–986 (1987).
Herron, T. J. Geophys. Res. Lett. 9, 17–20 (1982).
Purdy, G. M. J. geophys. Res. 87, 8403–8416 (1982).
Bratt, S. R. & Purdy, G. M. J. geophys. Res. 89, 6111–6125 (1984).
Murase, T. & McBirney, A. R. Geol. Soc. Am. Bull. 84, 3563–3592 (1973).
Salisbury, M. H. & Christensen, N. I. J. geophys. Res. 83, 805–817 (1978).
Fox, P. J. & Stroup, J. B. in The Sea Vol. 7 (ed. Emiliani, C.) 119–218 (Wiley, New York, 1981).
Hyndman, R. D. & Drury, M. J. J. geophys. Res. 81, 4042–4052 (1976).
Schreiber, E. & Fox, P. J. J. geophys. Res. 81, 4071–4076 (1976).
Houtz, R. & Ewing, J. J. geophys. Res. 81, 2490–2498 (1976).
Purdy, G. M. J. geophys. Res. 92, 9351–9362 (1987).
Macdonald, K. C. A. Rev. Earth planet. Sci. 10, 155–190 (1982).
Cann, J. R. Geophys. J. R. astr. Soc. 39, 169–187 (1974).
Kidd, R. G. W. Geophys. J. R. astr. Soc. 50, 149–183 (1977).
ARGO-RISE Group. Can. Mineral. 26, 467–486 (1988).
Hale, L. D., Morton, C. J. & Sleep, N. H. J. geophys. Res. 87, 7707–7718 (1982).
Toomey, D. R. thesis, Mass. Inst. Tech./Woods Hole Ocean. Inst. (1987).
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Toomey, D., Purdy, G., Solomon, S. et al. The three-dimensional seismic velocity structure of the East Pacific Rise near latitude 9° 30′ N. Nature 347, 639–645 (1990). https://doi.org/10.1038/347639a0
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DOI: https://doi.org/10.1038/347639a0
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