Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.168.1029w&link_type=abstract
Geophysical Journal International, Volume 168, Issue 23, pp. 1029-1033.
Astronomy and Astrophysics
Astronomy
34
Cross-Correlation, Interferometry, Scattering, Seismic Coda, Seismic Noise, Temporal Variation
Scientific paper
The technique of passive image interferometry applies interferometric methods to correlation functions of seismic noise to monitor small temporal variations of the Earth interior. We computed the autocorrelation function of seismic noise recorded at a single seismometer located in the vicinity of the source region of the Mw = 6.6 Mid-Niigata earthquake. Analysing the temporal evolution of the autocorrelation function, which is interpreted as the source-receiver collocated elastic wave Green's function, we detect a sudden decrease of relative seismic velocity in the Earth crust of -0.6 per cent that coincides with the occurrence of the earthquake. This drop of seismic velocity is likely to be caused by the change of stress in the source region of the earthquake.
Sens-Schönfelder Christoph
Wegler Ulrich
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