Abstract
DZIEWONSKI and Gilbert1 have claimed that they can detect changes at a seismic source, starting 80 s before the origin time inferred from (impulsive) body wave arrival times. I believe, however, that their conclusion is almost certainly an artefact of their data analysis technique.
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References
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Dziewonski, A. M., and Gilbert, F., Geophys. J. R. astr. Soc., 35, 401–437 (1973).
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GELLER, R. Evidence of precursive compression for two deep earthquakes. Nature 252, 28–29 (1974). https://doi.org/10.1038/252028a0
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DOI: https://doi.org/10.1038/252028a0
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