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Seismic travel-time anomalies from events in the western Soviet Union

VELA SEISMOLOGICAL CENTER, 312 MONTGOMERY STREET, ALEXANDRIA, VIRGINIA 22314

Abstract

An iterative technique and the joint epicenter determination technique are utilized to compute improved locations for 33 presumed underground explosions in the western Soviet Union and station corrections to the Herrin et al. (1968) travel-time curves for 98 stations. Comparison of the results of the two techniques indicates that the iterative procedure produces improved location accuracy relative to the joint epicenter determination technique. Analysis of the station corrections determined by this study indicate that epicenters located on a worldwide basis with these corrections are as reliable, or slightly better than those determined using corrections from previous studies. For events in the western Soviet Union, the station corrections are superior to previous estimates. Comparison of the travel-time corrections with magnitude residuals previously determined by North (1977) fails to indicate a strong worldwide correlation of early arrivals with increased amplitudes and late arrivals with decreased amplitudes.

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