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Abstract Azimuthally dependent station corrections for 321 seismological stations were estimated using data from 400 large earthquakes (1961-1964) and 30 large explosions. In the estimation procedure only data for epicentral distances in the range 20° to 105° were used, and the data were truncated to remove gross errors. In addition, estimates of variance of station error distributions were computed.
Herrin et al. (1968) studied this question.