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Geological Society, London, Special Publications; 2006; v. 262; p. 119-129;
DOI: 10.1144/GSL.SP.2006.262.01.07
© 2006 Geological Society of London

Geophysical and geological interpretation of discrepancies in site residuals in northern Morocco: a simple qualitative approach

L. Ait Brahim1, I. Mouayn1, A. Abdelouafi1, M. Benhalima1 & B. Tadili2

1 Université Mohammed V, Faculté des Sciences, Avenue Ibn Battouta, Laboratoire des Risque Géologiques, BP 1014 Rabat-Agdal, Morocco aitbrahi{at}fsr.ac.ma
2 Université Mohammed V, Institut Scientifique, Départment de Physique de Globe, Rabat, Morocco

Surface geology, gravimetric, and heat flow data are used to explain discrepancies between MD site residuals, using the average magnitude site residuals (AMSRj) which are opposite of the station corrections (cStaj) calculated for the 25 selected short-period seismic stations of the Moroccan seismological network. MD site residuals range from –0.29 to +0.32, and appear to be the result of the complex interaction of the predominant near-station geophysical and geological parameters. With this simple qualitative approach, we found that high negative residuals are obtained for older well-consolidated Precambrian crystalline rocks with low surface heat flow, and high positive residuals are attributed to recent unconsolidated sediments with high heat flow. The explanation for the intermediate residual values remains more complex and requires more accuracy and better quality data, and may not be fully justified in this study.