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Abstract:
We analyze S-receiver functions to investigate
variations of lithospheric thickness below the entire region
of Turkey and surrounding areas. The teleseismic data used
here have been compiled combining all permanent seismic
stations which are open to public access.We obtained almost
12 000 S-receiver function traces characterizing the seismic
discontinuities between the Moho and the discontinuity at
410 km depth. Common-conversion-point stacks yield wellconstrained
images of the Moho and of the lithosphere–
asthenosphere boundary (LAB). Results from previous studies
suggesting shallow LAB depths between 80 and 100 km
are confirmed in the entire region outside the subduction
zones. We did not observe changes in LAB depths across
the North and East Anatolian faults. To the east of Cyprus,
we see indications of the Arabian LAB. The African plate
is observed down to about 150 km depth subducting to the
north and east between the Aegean and Cyprus with a tear at
Cyprus. We also observed the discontinuity at 410 km depth
and a negative discontinuity above the 410, which might indicate
a zone of partial melt above this discontinuity.
