• The magnitude of completeness (Mc) of a seismic network is determined by a number of factors including station density, self-noise and passband of the sensor used, ambient noise environment and sensor installation method and depth. Sensor installation techniques related to depth are of particular importance due to their impact on network deployment costs. We present example simulations of array performance illustrating Mc for local and regional arrays using different installation depths. Models of typical noise in different depth ranges were derived by averaging background seismic PSDs from various Nanometrics projects throughout North America; they are representative of areas with limited overburden thickness (< 15 m) as commonly found in post-glacial environments around the world. Noise performance improves with depth, and this effect is frequency dependent, so the benefit of depth depends on the band of interest of seismic events as a function of distance and magnitude.