Seismic Ambient Noise: Group/Phase velocity dispersions and maps (Part II)

The CC contains velocity dispersion information (group/phase velocity) about the medium traversed by surface waves (the ambient seismic noise is mainly constituted by surface waves, see the previous article)  between each station pair. Once the dispersion information is extracted, it is possible to apply seismic tomography to obtain corresponding group and phase velocity maps. For the… Continue reading Seismic Ambient Noise: Group/Phase velocity dispersions and maps (Part II)

Seismic Ambient Noise: Cross-correlations (Part I)

Cross correlations and Ambient Seismic Noise (ASN) The recorded ambient seismic noise is generated mainly by natural sources such as meteorological and oceanic disturbances. For example, sea waves are capable of producing a certain pressure that can then vertically propagate to the sea floor and generate ground motion. The vertical force will also generate Rayleigh… Continue reading Seismic Ambient Noise: Cross-correlations (Part I)