Hz) Local scale (N.100 Hz) Hillers, G., Campillo, M., Lin, Y.-Y., Ma, K.-F., Roux, P., 2012. Anatomy of the high-frequency ambient seismic wave field at the TCDP borehole. J. Geophy. Res. 117 Olivier, G., F. Brenguier, M. Campillo, R. Lynch, and P. Roux, 2015, Body-wave reconstruction from ambient seismic noise correlations in an underground mine: Geophysics, 80 , KS11–KS25.
1-year noise correlation with earthquake data Poli et al. 2012a Z-Z noise correlations Z comp. actual earthquake Surface wave tomography body waves (deep reflections) Finland: ‘homogeneous’ Archean crust=> simple seismograms
of P and S multiple reflections CRR (data) GFRR (theory) Polarisation: noise correlation vs synthetics Good reconstruction of phase and relative amplitudes of the components of the reflected waves. (amplitude discussed by Prieto) A favorable context: distance vs. mean free path, amplitude in actual earthquake records Deep phases Poli et al., 2012a
50 100 150 200 0.1 0 0.1 time[s] Model 0.1 A C B Upper M antle Station 2 Station 1 Low er M antle 72° 64° 68° Earth’s mantle transition zone discontinuities from ambient seismic noise ( phase transition (P,T)) From Poli, Campillo, Pedersen and LAPNET WG, Science 2012
50 100 150 200 0.1 0 0.1 time[s] Model 0.1 A C B Upper M antle Station 2 Station 1 Low er M antle 72° 64° 68° Earth’s mantle transition zone discontinuities from ambient seismic noise ( phase transition (P,T)) In agreement with receiver functions (Alinaghi et al. 2003) From Poli, Campillo, Pedersen and LAPNET WG, Science 2012
S) waves at the global scale with noise sources at the surface: -Very weak scattering -A problem of a different nature, although indeed the uneven distribution surface noise sources is still there. This representation is not formally valid on the free surface: the integral vanishes. GF reconstruction would require a more complex procedure (Ruigrok et al., 2008) (Here also, the correlation of multiply scattered waves should lead to the Green function.)
and numerical simulation CC (ambient noise) CC(EQ days) PREM synth Synth EQ CC Very clear pulses in the correlations, likely holding information about the deep Earth, but should not be interpreted directly as components of the Green function Attempt to use a representation with a free surface condition boundary