Passive Acoustic and Seismic Tomography with Ocean Ambient Noise in Orion

We demonstrate that an estimate of the point-to-point seismic propagation Green Functions can be extracted from microseisms. These estimated Green’s function, obtained from 30 days of continuous seismic data from 151 seismic stations in Southern California, are used to extract the group velocity of surface waves between all station pairs in the network. The seismic data were then used in a simple, but densely sampled tomographic procedure to estimate the surface wave velocity structure within the frequency range of 0.10.2 Hz for a region in Southern California. The result compares favorably with previous estimates obtained using more conventional and elaborate inversion procedures. This demonstrates that coherent noise field between station pairs can be used for seismic imaging purposes.