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title of the reference :
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Crustal anomalies under the Tunisian seismograph array using teleseismic P waves.
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Publication Date:
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1985
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Author :
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Hfaiedh Mohamed, Dorel J., Dubois J.
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Catalogue type :
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Livre
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Catalogue reference :
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T.118 (NLD) Tectonophysics T.118 Crustal anomalies under the Tunisian seismograph array using teleseismic P waves. Etude des anomalies de la croûte dans la région du sismographe de Tunisie à l'aide des ondes télésismiques P. The object of this study is to understand the anomalies in the crustal structure under the seismograph array of Tunisia using teleseismic P waves at epicentral distances 30° < < 100°. By comparing the correction terms at pairs of neighbouring station, we have studied the variation of the travel-time anomalies as a function of azimuth and epicentral distance. More than 200 teleseisms recorded at four stations of the telemetered array from 1976 to 1979 are used. We have interpreted the traval-time anomalies between pairs of stations in terms of crustal structure. We propose a model with crustal thinning to the north and northeast of the Zaghouan station. This thinning reaches its maximum under the Menzel-Bouzelfa station in Cap-Bon. The model suggests that the Moho is dipping to about 18° to 20°, in good agreement with gravimetric data. bibliogr. levé sismique ; réseau sismique ; structure vitesse ; onde P ; Mohorovicic ; croûte terrestre ; correction ; temps parcours ; méthodologie analyse ; sismique réfraction ; modèle ; Manteau sup ; Tunisie ; Tunisie Nord Orientale ; Zaghouan ; Menzel Bouzelfa ; Cap Bon Dorel J. Dubois J. Hfaiedh Mohamed géophysique
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Indexation decimale :
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géophysique
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Keywords :
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levé sismique ; réseau sismique ; structure vitesse ; onde P ; Mohorovicic ; croûte terrestre ; correction ; temps parcours ; méthodologie analyse ; sismique réfraction ; modèle ; Manteau sup ; Tunisie ; Tunisie Nord Orientale ; Zaghouan ; Menzel Bouzelfa ; Cap Bon
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Summary :
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The object of this study is to understand the anomalies in the crustal structure under the seismograph array of Tunisia using teleseismic P waves at epicentral distances 30° < < 100°. By comparing the correction terms at pairs of neighbouring station, we have studied the variation of the travel-time anomalies as a function of azimuth and epicentral distance. More than 200 teleseisms recorded at four stations of the telemetered array from 1976 to 1979 are used. We have interpreted the traval-time anomalies between pairs of stations in terms of crustal structure. We propose a model with crustal thinning to the north and northeast of the Zaghouan station. This thinning reaches its maximum under the Menzel-Bouzelfa station in Cap-Bon. The model suggests that the Moho is dipping to about 18° to 20°, in good agreement with gravimetric data.
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TU1429
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