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Waveform cross correlation is an efficient tool for detection andcharacterization of seismic signals. The efficiency critically depends on theavailability of master events. For the purposes of the ComprehensiveNuclear-Test-Ban Treaty, cross correlation can globally reduce the thresholdmonitoring by 0.3 to 0.4 magnitude units. In seismically active regions, theoptimal choice of master events is straightforward. There are two approaches topopulate the global grid in aseismic areas: the replication of real masters andsynthetic seismograms calculated for seismic arrays of the InternationalMonitoring System. Synthetic templates depend on the accuracy of shape andamplitude predictions controlled by focal depth and mechanism, source function,velocity structure and attenuation along the master/station path. As in Part I,we test three focal mechanisms (explosion, thrust fault, and actual Harvard CMTsolution for one of the April 11, 2012 Sumatera aftershocks) and two velocitystructures (ak135 and CRUST 2.0). Sixteen synthetic master events weredistributed over a 1ox1o grid. We built five cross correlation standard eventlists (XSEL) and compared detections and events with those built using the realand grand master events as well as with the Reviewed Event Bulletin of theInternational Data Centre. The XSELs built using the source of explosion andak135 and the reverse fault with isotropic radiation pattern demonstrate theperformance similar to that of the real and grand masters. Therefore, it ispossible to cover all aseismic areas with synthetic masters without significantloss in seismic monitoring capabilities based on cross correlation.

Waveform cross correlation for seismic monitoring of underground nuclear explosions. Part II: Synthetic master events