Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...51..133g&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 51, Issue 1-3, p. 133-152.
Physics
11
Scientific paper
The 3-D velocity structure beneath France is investigated by using a method based upon teleseismic waveform analysis and a block inversion technique. In this method, the P-wave travel time is computed exactly in cach block for a spherical Earth model and the P-wave arrival times are obtained by cross-correlating the waveforms observed in 26 stations of the LDG network. One image is obtained directly from the observed signals, the other two are obtained from low-pass filtered waveforms with 0.5 and 0.25 Hz cut-off frequencies. The results show that the 3-D velocity image depends weakly but significantly on the cut-off frequency of the low-pass filter. In addition to possible changes in the signal-to-noise ratio, this may indicate a dependence of the tomographic images on the seismic wavelength. The best fit to the data is obtained from the 0.5 Hz image. The main features of this image are a clear indication of a lithospheric root beneath Switzerland, a general large scale W-E variation of velocity within the lithosphere and a diffuse low-velocity area beneath the French Massif Central and the western part of the Alps in the 100-250 km layer.
Cara Mihai
Granet Mathieu
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