Fig. 3: Effect of large-N arrays in conventional beamforming (not CLEAN).
From: Remotely imaging seismic ground shaking via large-N infrasound beamforming
a Array geometries used in this and other figures: the PARK 22-element large-N array and a three-element subset. b The three-element array’s response has a broad main lobe and close sidelobes, compared to c the compact response of the large-N array. Dashed circles in (b, c) are wavenumbers corresponding to infrasound with frequency of 2 Hz (inner) and 10 Hz (outer). d The slowness spectrum of secondary earthquake infrasound calculated using the three-element array is blurry and less detailed than (e), the slowness spectrum of the same data calculated using the large-N array. Dashed circles in (d, e) indicate 3 s km-1 (the slowness of sound).
