Scales of heterogeneity near the core‐mantle‐boundary
作者:
Eugene M. Lavely,
Donald W. Forsyth,
Phyllis Friedemann,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 13
页码: 1505-1508
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i013p01505
数据来源: WILEY
摘要:
We have mapped shear velocity variations near the base of the mantle with ScS‐S differential travel times. Beneath the North Atlantic, there is a systematic variation in velocity over a distance of 1500 km or more, with a pronounced low velocity anomaly centered roughly beneath Madeira island. Beneath the northern Indian Ocean, there is no similar long‐wavelength anomaly. The average ScS‐S residual beneath the Indian Ocean is 3.6 ± 0 .7 s more negative than the Atlantic residual, indicating faster average velocities near the base of the
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