Multifrequency inversion of global ambient seismic sources

SUMMARY We develop and apply a method to constrain the space- frequency-dependent location of ambient noise sources. This is based on cross-correlation inversion using numerical wavefield simulations, which honour 3-D crustal mantle structure, ocean loading finite-frequency effects. In frequency range from 3 20 mHz, our results global source distribution Earth’s hum, averaged over Southern Hemisphere winter season 9 yr. During winter, dominant sources are largely confined Hemisphere, most prominent exception being Izu-Bonin-Mariana arc, active region between 12 mHz. Generally, strong hum seem be associated with either coastlines or bathymetric highs. contrast, deep basins devoid While relatively small number STS-1 broad-band stations that have been recording continuously 2004 2013, demonstrate practical feasibility accounts for complexities wave propagation. It may thereby improve full-waveform inversions understanding physics generation.