Abstract
IT has been established that P and S times to stations in shield areas are significantly earlier than times to other continental regions at similar epicentral distances1–4. The observed differences, called “station anomalies”, are largely produced by variations in the properties of the low velocity layer within the upper mantle5,6, thus providing one of the few means available for estimating such variations. Except for some studies based on the dense seismic network in California7–9, however, detailed investigations of upper mantle structure by this method have been precluded by the relatively sparse distribution of permanent stations.
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CLEARY, J., SIMPSON, D. & MUIRHEAD, K. Physical Sciences: Variations in Australian Upper Mantle Structure, from Observations of the Cannikin Explosion. Nature 236, 111–112 (1972). https://doi.org/10.1038/236111a0
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DOI: https://doi.org/10.1038/236111a0
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