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Ambient seismic noise levels: A survey of the permanent and temporary seismographic networks in morocco

AuthorsEl Fellah, Y.; Khairy Abd El-Aal, A.E.A.; El Moudnib, L.; Harnafi, M.; El Ouai, D.; Himmi, M. M.; Chourak, M.; Villaseñor, Antonio ; Gallart Muset, Josep ; Thomas, C.
Keywordspower spectral density
Peterson models
seismic arrays
Ambient seismic noise
Issue Date2014
PublisherUniversité Mohammed V, Rabat
CitationBulletin de l'Institut Scientifique, Section Sciences de la Terre 36: 39-54 (2014)
AbstractWe present, in this paper, the results of an analysis of the variations in ambient seismic noise levels from data collected for the first time in Morocco. For this purpose, 23 broadband seismic stations were deployed in different structural domains covering Rif Mountains, Middle and High Atlas and parts of the Anti-Atlas. We calculated power spectral densities (PSD) of background noise for each ground motion component recorded at different sites, and then compared the results with the high-noise and low-noise models of Peterson (1993). Time intervals (of day and night) were indiscriminately considered for computation of noise level regardless of the selected earthquakes. Furthermore, we have extended the discussion about noise to different frequency bands of interest. We found several variabilities in the PSD levels at all stations. The significant variability was observed at long periods in most stations. The results of this study could be used to evaluate future emplacements of new seismic stations and therefore can help to develop new seismic noise models in North Africa.
Identifiersissn: 1114-6834
e-issn: 2458-7184
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