Regional variations in<i>P</i>travel times

Abstract

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.