Geophysical and geological interpretation of discrepancies in site residuals in northern Morocco: a simple qualitative approach
L. Ait Brahim, I. Mouayn, A. Abdelouafi, M. Benhalima, B. Tadil, 2006. "Geophysical and geological interpretation of discrepancies in site residuals in northern Morocco: a simple qualitative approach", Tectonics of the Western Mediterranean and North Africa, G. Moratti, A. Chalouan
Download citation file:
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.
Figures & Tables
This book provides an insight into the overall tectonic evolution of the Western Mediterranean region and North Africa. The tectonic setting of the region reflects a long-lived and complex evolution, mainly related to the Alpine Orogeny. This inheritance is expressed by an intricate pattern of arc-shaped mountain chains, the Alps, the Betic–Rif Cordilleras and the Apennine–Maghrebian belt, whose southern branches mark the present limit between the African and Eurasian plates. The volume covers the Maghrebian chains in North Africa, from Tunisia to Morocco and the Western and Central Mediterranean, from Spain to Italy from the pre-orogeric phases (Palaeozoic–Mesozoic) to the post-collisional neotectonic and Quaternary development. It includes both original research papers and syntheses dealing with the aspects of structural, sedimentary, metamorphic and marine geology.