hide
Free keywords:
-
Abstract:
The island of Crete is the principal landmass in the Aegean arc system. Collision of the Euroasian plate
in the north and the African plate in the south gives rise to the subduction related deformation along the
Hellenic arc. As a result of the complex deformation, the area is characterized by high seismic activity.
Paleoseismic investigations performed along the Kera fault scarp, which is part of a N-S oriented fault
system along the Spatha peninsula (NW-Crete), show clear evidence of repeated normal faulting events.
Five distinct episodes of faulting are observed. The first two are probably of Middle-Miocene or younger age
representing older tectonic episodes, whereas the last three indicate co-seismic displacements most likely
during the Pleistocene and Holocene. This is in good agreement with the previous estimates of Holocene
average slip rate and the recurrence time estimate of large earthquakes in the order of ca. 1mm/yr and
3000yrs, respectively. The Kera fault represents a NE-SW oriented bend in a N-S fault system and therefore
has a minor left-lateral strike-slip component. During the 1980’s at least three earthquakes could be
associated with the Kera fault. More recently, in 1999, there were three small (with magnitudes between
3.0-4.5) offshore events that are probably associated with the same fault system in the offshore extension
(to the north) of the N-S oriented faults along the Spatha peninsula. The existence of these earthquakes as
well as the recent paleoseismic results clearly demonstrates the need of revising the seismic hazard
assessment of the area. The length of the N-S oriented fault system, where the Kera fault represents the
middle segment, reaches to a total of 30 km., and is capable of generating an earthquake of magnitude in
the range 6.0-6.7. Such a (shallow) earthquake occurring at a short distance to the densely populated northwestern
coast of Crete is likely to have tragic consequences.
