Mantle Seismic Structure Beneath the MELT Region of the East Pacific Rise from P and S Wave Tomography-Reference-Cited by-同舟云学术

Mantle Seismic Structure Beneath the MELT Region of the East Pacific Rise from P and S Wave Tomography

Published:1998-05-22 Issue:5367 Volume:280 Page:1224-1227
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Toomey Douglas R.¹²³⁴,Wilcock William S. D.¹²³⁴,Solomon Sean C.¹²³⁴,Hammond William C.¹²³⁴,Orcutt John A.¹²³⁴

Affiliation:

1. D. R. Toomey and W. C. Hammond, Department of Geological Sciences, University of Oregon, Eugene, OR 97403, USA.

2. W. S. D. Wilcock, School of Oceanography, University of Washington, Seattle, WA 98195, USA.

3. S. C. Solomon, Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA.

4. J. A. Orcutt, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093, USA.

Abstract

Relative travel time delays of teleseismic P and S waves, recorded during the Mantle Electromagnetic and Tomography (MELT) Experiment, have been inverted tomographically for upper-mantle structure beneath the southern East Pacific Rise. A broad zone of low seismic velocities extends beneath the rise to depths of about 200 kilometers and is centered to the west of the spreading center. The magnitudes of the P and S wave anomalies require the presence of retained mantle melt; the melt fraction near the rise exceeds the fraction 300 kilometers off axis by as little as 1%. Seismic anisotropy, induced by mantle flow, is evident in the P wave delays at near-vertical incidence and is consistent with a half-width of mantle upwelling of about 100 km.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference20 articles.

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4. Because of relatively high noise levels at the experiment site [Webb S. C., Rev. Geophys. 36, 105 (1998)], P waves could be identified only at frequencies less than 0.5 Hz on vertical-component seismometers and less than 0.14 Hz on pressure gauges. Pressure records were not used, because the time resolution is not adequate and water-column reverberations ofP waves distort the waveforms. On the vertical component, the first reverberation arrives after the first full cycle of directP and is only about one-third the amplitude, so it contributes little error to the delay time.

5. Shear-Wave Splitting and Implications for Mantle Flow Beneath the MELT Region of the East Pacific Rise

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