Seismological constraints on the crustal structure beneath the Zagros Mountain belt (Iran)

摘要: SUMMARY The Zagros Mountain belt of western Iran results from the collision Arabian and Central continental blocks. stage is unclear crustal structure rather poorly known. In this study we investigate velocity crust upper mantle beneath Ghir region located in using data collected by a temporary local seismological network including broad-band instrument. structures sedimentary cover crystalline are estimated inversion P S traveltimes earthquakes recorded on dense network. consists an ∼11 km thick layer (V p ∼ 4.70 s −1 ) above ∼8 5.85 ). lower depth Moho found receiver function analysis teleseismic earthquakes. unusually slow 6.5 ∼27 thick. bound for total thickness 46 ± 2 km. A comparison with available information Platform shows that, at present, has thinner crust. current comparable to pre-collision Platform, suggesting that now very early collision.