Variations in P-wave Travel Times Based on a Digital Seismogram Dataset

The paper presents the parameters of digital seismograms of artificial seismic events observed in from 1967 to 1990. The data were provided to the authors from the archive of the Sadovsky Institute of Geosphere Dynamics (IDG RAS). Seismograms were obtained after reformatting digital records. The archived data were analyzed to obtain a posteriori information on P-wave travel times, determined from the moment of the first arrival on the record of the vertical component (Z) of the short-period channel. The practice has shown that combining these data is sufficient to compile a map of signal arrival times from seismic sources. We present the regional travel-time curve for three test sites and linear trends of P-wave travel times by calendar date, as well as an isochron map for one of the sites.