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Science 21 April 1995:
Vol. 268. no. 5209, pp. 391 - 395
DOI: 10.1126/science.268.5209.391
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Articles

Seismic Images of Active Magma Systems Beneath the East Pacific Rise Between 17°05' and 17°35'S

John C. Mutter 1, Suzanne M. Carbotte 1, Wusi Su 1, Liqing Xu 1, Peter Buhl 1, Robert S. Detrick 2, Graham M. Kent 2, John A. Orcutt 3, and Alistair J. Harding 3

1 Lamont-Doherty Earth Observatory of Columbia University, Box 1000, Palisades, NY 10964, USA.
2 Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
3 Scripps Institution of Oceanography, La Jolla, CA 92093, USA.

Seismic reflection data from the East Pacific Rise between 17°05' and 17°35'S image a magma lens that varies regularly in depth and width as ridge morphology changes, confirming the notion that axial morphology can be used to infer ridge magmatic state. However, at 17°26'S, where the ridge is locally shallow and broad, the magma lens is markedly shallower and wider than predicted from regional trends. In this area, submersible dives reveal recent volcanic eruptions. These observations indicate that it is where the width and depth of the magma chamber differ from regional trends, indicating an enhanced magmatic budget, that is diagnostic of current magmatism.

Submitted on October 14, 1994
Accepted on January 17, 1995


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Off-Axis Crustal Thickness Across and Along the East Pacific Rise Within the MELT Area.
J. P. Canales, R. S. Detrick, S. Bazin, A. J. Harding, and J. A. Orcutt (1998)
Science 280, 1218-1221
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Shipboard Geophysical Indications of Asymmetry and Melt Production Beneath the East Pacific Rise Near the MELT Experiment.
D. S. Scheirer, D. W. Forsyth, M. Cormier, and K. C. Macdonald (1998)
Science 280, 1221-1224
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A seismic inversion study of the axial magma chamber reflector beneath the East Pacific Rise near 10{degrees}N.
J. S. Collier and S. C. Singh (1998)
Geological Society, London, Special Publications 148, 17-28
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The Effect of Magmatic Activity on Hydrothermal Venting Along the Superfast-Spreading East Pacific Rise.
T. Urabe, T. Urabe, E. T. Baker, J. Ishibashi, R. A. Feely, K. Marumo, G. J. Massoth, A. Maruyama, K. Shitashima, K. Okamura, et al. (1995)
Science 269, 1092-1095
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