Abstract

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° < Δ < 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 travel-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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