Abstract
Summary An investigation of the lithospheric structure of the Iranian plateau has been undertaken in order to find complementary information bearing on the tectonic evolution of the plateau. The phase velocity dispersion of the fundamental mode Rayleigh waves between the WWSSN stations Shiraz, Tabriz and Mashad, and between the sites of the Iranian Long Period Array and MAIO SRO have been obtained from well-dispersed wavetrains generated by eight great circle earthquakes. The aftershocks of the destructive Tabas earthquake in central Iran which were accurately located by a field survey recorded clear P and S phases at MAIO providing supplementary travel-time information for the interpretation of the phase velocity data. The uppermost mantle P-wave velocities beneath Iran obtained in a previous study (Asudeh) were also used in the analysis. An Alpine type crust was found for the Iranian plateau while uppermost mantle velocities ranging from low-velocity mantle in eastern Iran to a high-velocity shield-like structure in the west of the country.
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