B. Meyer et al., THE 1995 GREVENA (NORTHERN GREECE) EARTHQUAKE - FAULT MODEL CONSTRAINED WITH TECTONIC OBSERVATIONS AND SAR INTERFEROMETRY, Geophysical research letters, 23(19), 1996, pp. 2677-2680
After the 1995 Grevena M(S) = 6.6 event in northern Greece, we mapped
the earthquake fault break in detail. The surface break is small (8-12
km long, 4 cm slip) compared to the moment release of the event. Howe
ver, the morphologic and tectonic study of the active faults, in the f
ield and using the SPOT satellite imagery, suggests that the earthquak
e ruptured part of a much larger fault system including interconnectin
g segments. We used SAR interferometry of the satellite ERS-1 imagery
to characterize the coseismic displacement field. This shows a kidney-
shaped zone of subsidence reaching 30 cm flanked by an uplift zone rea
ching 5 cm. We reproduce this field using dislocations in an elastic h
alf-space and our observations of the fault system. This requires 1 m
slip from 4 to 15 km depth on a main normal fault segment dipping NNW.
Our preliminary model includes significant NE-dipping scissors faulti
ng at the eastern end of the rupture, clearly seen in the interferogra
ms.