
Emergence of body waves from cross‐correlation of short period seismic noise
Author(s) -
Poli P.,
Pedersen H. A.,
Campillo M.
Publication year - 2012
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2011.05271.x
Subject(s) - seismogram , seismology , seismic noise , geology , microseism , rayleigh wave , surface wave , noise (video) , seismic wave , ambient noise level , geophysics , polarization (electrochemistry) , geodesy , physics , optics , geomorphology , sound (geography) , chemistry , artificial intelligence , computer science , image (mathematics)
SUMMARY Ambient noise correlation is now widely used in seismology to obtain the surface waves part of Green's function. More difficult is the extraction of body waves from noise correlations. Using 42 temporary broad‐band three components stations located on the northern part of the fennoscandian region, we identify high‐frequency (0.5–2 Hz) body waves emerging from noise correlations for inter‐station distances up to 550 km. The comparison of the noise correlations with earthquake data confirms that the observed waves can be interpreted as P and S waves reflected from the Moho. Because the crustal model of the area is well known, we also compared the noise correlations with synthetic seismograms, and found an excellent agreement between the travel times of all the observed phases. Polarization analysis provides a further argument to confirm the observation of body waves.