Physics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...32..168w&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 32, Issue 2, p. 168-181.
Physics
2
Scientific paper
A method for analysing travel times measured at a large array or a network of seismographs from many earthquakes within a specific region has been developed. Approximate relative station corrections are calculated from the residuals on a least-squares line or least-squares quadratic form fitted through the times for each earthquake, and may be improved by iteration after a preliminary travel-time curve has been derived. Accurate relative baseline corrections for each earthquake are also calculated iteratively, and an optimum slowness-distance curve is determined from the combined corrected travel times from all earthquakes using a trade-off procedure. Calculations using synthetic travel-time data suggest that abrupt changes in slowness of ~ 0.4 s deg-1 due to the presence of triplications are generally resolvable, provided that the effects of lateral variations are small, even with random epicentre mislocations in the range +/- 0.5°. Slowness measurements at a network of temporary stations deployed across Australia do not show any discontinuities in slowness greater than 0.2 s deg-1 in the distance range 45-54°. Similar measurements at the Warramunga array from the same source regions, however, suggest the presence of complexity in the slowness curve at distances close to 50°. Relative arrival times at the temporary network generally have standard deviations less than 0.25 s, thus suggesting that details of structure finer than those derived from conventional travel-time studies can be resolved.
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