Doctoral thesis

Crustal structure from cepstral analysis of teleseisms and its application to a transeuropean profile

Number of pages161
Imprimatur date1987-06-03

In this work we studied the feasibility of cepstral analysis of Crustal Transfer Ratios (CTR's) of teleseisms, and applied it to data from the NARS (Network of Automatically Recording Seismographs) array to obtain a transeuropean crustal profile.

We first studied the effect of the spectral method on cepstral analysis: Fast Fourier Transform (FFT) and Maximum Entropy Method (MEM) routines have been applied to both synthetic and real data. Good results are obtained either using FFT exclusively or a combination of FFT and MEM. In the first case (FFTCA: FFT Cepstral analysis) FFT is used to compute the spectra of vertical and horizontal seismic components and to evaluate the cepstrum.

In the second case (FMCA: FFT plus MEM Cepstral analysis), the cepstrum is worked out by means of MEM. It seems that the best strategy is to apply both FFTCA and FMCA and cross check their results. Moreover, for real data good results are obtained only if a phase-cepstrum is introduced. In particular, we first evaluate the phase of CTR's obtained by different teleseisms, then we take their average and apply cepstral analysis to it.

This procedure has been used to investigate the crustal structure beneath the Graefenberg seismic observatory (FRG). The results obtained are in very good agreement with the model that Aichele (1976) worked out on the basis of seismic refraction studies.

The method has then been used to analyse data from the NARS array (from Denmark to Spain), to study the crustal structure in the different tectonic provinces covered by the array. The values found for the crustal thicknesses are in reasonable agreement with current geophysical information.

Citation (ISO format)
BONINO-LEVATO, Lucia. Crustal structure from cepstral analysis of teleseisms and its application to a transeuropean profile. 1987. doi: 10.13097/archive-ouverte/unige:176321
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