Seismic waveform correlation offers the prospect of greatly reducing event detection thresholds when compared with more conventional processing methods. Correlation is applicable for seismic events that in some sense repeat, that is they have very similar waveforms (e.g., Gibbons and Ringdal, 2006). A number of recent studies have shown that correlated seismic signals may form a significant fraction of seismicity at regional distances (e.g., Schaff and Richards, 2011; Dodge and Walter, 2015; Slinkard et al., 2015). For the particular case of multiple nuclear explosions at the same test site, regional distance correlation also allows very...

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