Abstract
It has been suggested that a non‐linear, multi‐channel summation process increases the signal‐to‐noise ratio of small coherent signals. Using the data base of the International Seismic Month, it is shown conclusively that a logarithmic beamforming process increases the detection probability for seismic events for a specified false alarm rate by at least a factor of two. A detector based on this process is working on‐line at the Yellowknife seismic array.
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