Abstract
OBSERVATIONS from two large seismic arrays suggest that lateral heterogeneity is present throughout the Earth's mantle. The differences between seismic event locations determined by the arrays and event locations determined by a global network of seismic stations indicate that seismic rays are deflected by velocity anomalies in the mantle.
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POWELL, C. Evidence for mantle heterogeneity from two large seismic arrays. Nature 254, 40–42 (1975). https://doi.org/10.1038/254040a0
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DOI: https://doi.org/10.1038/254040a0
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