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Directivity effects are a characteristic of seismic source finiteness and are a consequence of the rupture spread in preferential directions. These effects are manifested through seismic spectral deviations as a function of the observation location. The directivity by Doppler effect method permits estimation of the directions and rupture velocities, beginning from the duration of common pulses, which...
A study of focal mechanisms of earthquakes and stress indicators are presented for Portugal and its adjacent Atlantic margins. Recently Riberio et al. (1996) published a work on this subject. In this study, we introduce new focal mechanisms of nine earthquakes. We use these results together with 12 other focal mechanisms and the main tectonic features in the region to define more accurately the type...
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