Comparison of seismic noise signal processing methodologies for data recorded in the Paraná, Chaco-Paraná and Pantanal basins region
Keywords:
seismic noise, cross-correlation, stack, similarity, seismic structureAbstract
The extraction of the Green's function from the cross-correlation of seismic noise data between pairs of stations is achieved because seismic noise is recorded at both stations, without the need for an earthquake to occur. The stacking of cross-correlations over a long period of time improves the waveforms and contributes to reduce the difficulties generated by the irregular distribution of noise sources. In this study we compare two methodologies for the cross-correlation determination, the Geometrically Normalized Cross-Correlation and the Phase Cross-Correlation, and two different procedures of stacking, the Linear Stack and the Phase-Weighted Stack, applied to seismic noise data recorded in the region of the Paraná, Chaco-Paraná and Pantanal basins, in South America. The analysis of similarity based on the amount of days considered in the stack, allows us to define certain parameters of the preprocessing, such as the cut-off frequencies of the bandpass filter and the length of the records. Based on this analysis, we have concluded that the Phase Cross-Correlation methodology is the best option for these data, being one year of data enough to obtain the adequate stability in the results. Both procedures of stacking have produced similar results for these data.
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