Abstract
Seismic interferometry (SI) refers to the principle of generating new seismic responses using crosscorrelations of existing wavefield recordings. In this study, we report on the use of a specific interferometric approach, called seismic interferometry by multidimensional deconvolution (SI by MDD), for the purpose of retrieving surface-wave responses. In theory, SI by MDD suffers less from irregularities in the distribution of (passive) sources than conventional SI. Here, we confirm this advantage for the application to surface waves originating from regional earthquakes close to Central Chile. For that purpose, we use the Malargüe seismic array in Argentina. This T-shaped array consists of two perpendicular lines of stations, which makes it rather suitable for the application of SI by MDD. Comparing the responses retrieved through SI by MDD to the responses retrieved using conventional SI, we find that the application of SI by MDD results in surface-wave responses that are both more accurate and more stable than surface-wave responses that are retrieved using conventional SI. That is, our results demonstrate that SI by MDD suffers less from non-uniformly distributed earthquakes and differences in the power spectra of earthquake responses. In addition, we show that SI by MDD mitigates the effect of site amplification on the retrieved surface waves.
Highlights
Seismic interferometry (SI) is a powerful tool for generating responses between receivers
MDDwith witha athreshold threshold; (b)(b) are associated with different ranks); To draw firmer conclusions, we investigate the stability of the phase and amplitude with respect to their mean for all virtual sources
We investigated the retrieval of surface waves in the presence of site amplification
Summary
Seismic interferometry (SI) is a powerful tool for generating responses between receivers. SI has been applied to recordings of diffuse fields, such as coda waves [3] and ambient noise [4,5,6], and data from transient fields, such as earthquake records [7] and active-source data [8,9,10]. This technique can be used to retrieve, among others, body- and surface-wave responses, both of which have played an important role in seismology, as they can provide key information about the Earth’s interior. Whereas most interferometric studies in seismology rely solely on crosscorrelations, we will, in this study, use a more advanced interferometric technique called SI by multidimensional deconvolution (MDD)
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