by G. PETRESCU, E. PETERSCHMITT2, C. RADU1, G. PURCARU1 and ST. LASCU3
1 Centre for Geophysical Research, Department of Seismology, Bucharest
2 Institut de Physique du Globe, Strasbourg
3 University of Bucharest, Faculty of Physics
This paper studies the nature of faulting and stress pattern in the Oriental
Mediterranean seismic region. The deep earthquakes are characterized by
the same focal mechanism as those from the Vrancea region (type Vv– thrust
faulting). In the three seismic zones – Tyrrhenian Sea, Vrancea and
Oriental Mediterranean Sea – which belong to the Mediterranean Alpine
belt the thrust and normal faulting motions prevail in the upper mantle.
Ritsema's conclusion according to which the number of earthquakes of the
transcurrent type decreases with the depth is confirmed.