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

By
L. Ait Brahim
L. Ait Brahim
UniversitéMohammed V, Faculté des Sciences, Avenue Ibn Battouta, Laboratoire des Risque Géologiques, BP 1014 Rabat-Agdal, Morocco (e-mail: aitbrahi@fsr.ac.ma)
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I. Mouayn
I. Mouayn
UniversitéMohammed V, Faculté des Sciences, Avenue Ibn Battouta, Laboratoire des Risque Géologiques, BP 1014 Rabat-Agdal, Morocco (e-mail: aitbrahi@fsr.ac.ma)
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A. Abdelouafi
A. Abdelouafi
UniversitéMohammed V, Faculté des Sciences, Avenue Ibn Battouta, Laboratoire des Risque Géologiques, BP 1014 Rabat-Agdal, Morocco (e-mail: aitbrahi@fsr.ac.ma)
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M. Benhalima
M. Benhalima
UniversitéMohammed V, Faculté des Sciences, Avenue Ibn Battouta, Laboratoire des Risque Géologiques, BP 1014 Rabat-Agdal, Morocco (e-mail: aitbrahi@fsr.ac.ma)
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B. Tadil
B. Tadil
UniversitéMohammed V,Institut Scientifique, Département de Physique de Globe, Rabat,Morocco
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Published:
January 01, 2006

Abstract

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.

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Contents

Geological Society, London, Special Publications

Tectonics of the Western Mediterranean and North Africa

G. Moratti
G. Moratti
CNR-Institute of Geosciences and Earth Resources, Italy
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A. Chalouan
A. Chalouan
University of Mohammed V Agdal, Rabat, Morocco
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Geological Society of London
Volume
262
ISBN electronic:
9781862395107
Publication date:
January 01, 2006

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