Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.179..367r&link_type=abstract
Geophysical Journal International, Volume 179, Issue 1, pp. 367-373.
Astronomy and Astrophysics
Astronomy
6
Time Series Analysis, Interferometry, Surface Waves And Free Oscillations, Seismic Tomography, Wave Propagation
Scientific paper
This study deals with surface waves extracted from microseismic noise in the (0.1-0.2 Hz) frequency band with passive seismic-correlation techniques. For directive noise, we explore the concept of passive seismic-noise tomography performed on three-component sensors from a dense seismic network. From the nine-component correlation tensor, a rotation algorithm is introduced that forces each station pair to re-align in the noise direction, a necessary condition to extract unbiased traveltime from passive seismic processing. After rotation is performed, the new correlation tensor exhibits a surface wave tensor from which Rayleigh and Love waves can be separately extracted for tomography inversion. Methodological aspects are presented and illustrated with group-speed maps for Rayleigh and Love waves and ellipticity measurements made on the San Andreas Fault in the Parkfield area, California, USA.
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