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The 16 August 1997 Novaya Zemlya Seismic Event as Viewed from GSN Stations KEV and KBS


Location

Figure 3 - S-minus-P time as a function of seismic event for stations KEV and KBS. Times were obtained from ISC Bulletins, except for the 16 August event, which were read from KEV and KBS records. KEV was upgraded from a short-period, vertical-component station to a broadband, three-component station.

Figure 4 - Comparison of NZTS explosion waveforms (in red) and the 16 August event waveforms. All records are instrument-corrected and are displayed as velocity in m/s. Note that the difference in S-minus-P time between NZTS explosions and the 16 August event is about 8 sec.

Figure 5 - Detailed view of seismic records from KEV of the 16 August event (blue) and the 1990 NZTS nuclear explosion (red). I picked Sn arrivals on tangential records where the waveform amplitude starts to emerge from the P coda.

     


Figure 6 - S-minus-P time as a function of seismic event. All time were read directly from KEV records to make this figure. The S-minus-P time for NZTS explosions is 100+/- 1 s while the S-minus-P time for the 16 August event is 108 s. Thus, the 16 August event could not have occurred near NZTS, regardless of velocity model assumptions.

Figure 7 - Seismic events from on or near Novaya Zemlya. I used the S-minus-P time from the 1990 NZTS explosion (black arc) to convert S-minus-P times from the 16 August event as picked at KEV and KBS, see Figure 2) into distance. The blue arcs associated with KEV and KBS nearly intersect the PIDC location (blue diamond), which was obtained independently of stations KEV and KBS.

  


Introduction | Background | Location | Discrimination | Summary