For decades, seismic data stacking has been used to improve the signal-to-noise ratio (SNR) of coherent arrivals in seismic recordings. Seismic arrays are especially well-suited for this task and have been used to detect and identify typically weak seismic arrivals (e.g.,Birtill and Whiteway 1965; Green et al. 1965). Seismic arrays are deployments of no fewer than three seismometers with uniform instrumentation that allow the recorded time series to be stacked as an ensemble. Typical array apertures range from 2 km to 200 km (Rost and Garnero 2004) and consist of 10 to 100 stations....

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