Simultaneous retrieval of body and surface waves in the Dehdasht area, Iran, from the seismic ambient field and the observation of spurious artefacts

SUMMARY Recent developments in sensor technology have allowed for the low-cost deployment of dense seismic arrays which continuously record the seismic ambient noise field. Generally, the extraction of body waves from the seismic ambient noise field is more challenging than for surface waves, due to...

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Bibliographic Details
Published in:Geophysical journal international 2021-11, Vol.227 (2), p.1193-1203
Main Authors: Riahi, Ali, Shomali, Zaher-Hossein, Obermann, Anne, Kamayestani, Ahmad
Format: Article
Language:English
Subjects:
Body waves
Numerical modelling
Seismic interferometry
Seismic noise
Surface waves and free oscillations
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Summary:SUMMARY Recent developments in sensor technology have allowed for the low-cost deployment of dense seismic arrays which continuously record the seismic ambient noise field. Generally, the extraction of body waves from the seismic ambient noise field is more challenging than for surface waves, due to the dominant amplitude of the latter. In this study, we work with data from a dense seismic array deployment in the Dehdasht area, southwestern Iran. We show that by using the polarization properties of seismic waves, we can simultaneously retrieve both high frequency body waves and surface waves from the cross-correlated noise field. As a by-product of this study, we also observe high energy spurious artefacts, particularly those associated with the direct P-phases. Numerical simulations show that these artefacts are a consequence of an uneven distribution of noise sources, and are difficult to suppress during the simultaneous retrieval of body and surface waves.
ISSN:0956-540X
1365-246X
1365-246X
DOI:10.1093/gji/ggab267