Abstract
Lilwall and Douglas1 recently described two methods for the determination of epicentres of seismic events, using data from the four UK designed seismic arrays. In their first method they use tables of phase velocity against distance, and for their second method they claim to use “azimuth only”. Although I admire the elegance of many-variable non-linear least-squares fits, I wish to draw attention to the fact that, contrary to the claims of the authors, their second method still uses dT/dΔ as a function of distance, even though corrections for the preliminary dT/dΔ are now calculated, along with the epicentre and origin-time corrections. Predictably, the increased number of unknowns in the second method makes the solutions less stable.
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Lilwall, R. C., and Douglas, A., Nature, 220, 362 (1968).
Weichert, D. H., Manchee, E. B., and Whitham, K., Geophys. J. R. Astro. Soc., 13, 277 (1967).
Blamey, C., and Gibbs, P. G., Geophys. J. R. Astro. Soc., 16, 1 (1968).
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WEICHERT, D. Epicentre Determination by Seismic Arrays. Nature 222, 155 (1969). https://doi.org/10.1038/222155a0
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DOI: https://doi.org/10.1038/222155a0
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