Lower Mantle Lateral Heterogeneity Beneath the Caribbean Sea-Reference-Cited by-同舟云学术

Lower Mantle Lateral Heterogeneity Beneath the Caribbean Sea

Published:1999-09-10 Issue:5434 Volume:285 Page:1711-1715
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Tibuleac Ileana Madalina¹,Herrin Eugene¹

Affiliation:

1. Department of Geological Sciences, Southern Methodist University, Dallas, TX 75275–0395, USA. E-mail: (for I.M.T.) (for E.H.)

Abstract

Seismic wave reflections from Earth's core recorded at seismic arrays in North America from events in the Caribbean Islands, Venezuela, and the Mid-Atlantic Ridge have observed slownesses more than 64 percent greater than predicted by the IASPEI91 standard Earth model. P waves turning in the lowermost mantle beneath the same region also have anomalous slowness. The slowness anomalies are not accompanied by significant travel time residuals and appear to be caused by lateral inhomogeneities in the velocity structure of the lower mantle.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference28 articles.

1. We use the notation “deg.” for epicentral distance units and the degree sign (°) for degrees of azimuth or angle of incidence. One deg. is equivalent to ∼111.2 km.

2. A seismic array is a set of sensors (seismometers) distributed over an area of Earth's surface at spacing narrow enough so that the signal may be correlated across the array (3). The data used in our analysis and further information about the arrays are available at

3. K. Aki and P. G. Richards Quantitative Seismology Theory and Methods (Freeman San Francisco 1980).

4. B. L. N. Kennett Ed. IASPEI 1991 Seismological Tables (Research School of Earth Sciences Australian National University Canberra Australia 1991). IASPEI is the International Association of Seismology and Physics of the Earth's Interior.

5. Powell C., Nature 254, 40 (1973).

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