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Gok, R., Sandvol, E., Turkelli, N., Seber, D., and Barazangi, M.

Sn attenuation in the Anatolian and Iranian plateau and surrounding regions

Geophysical Research Letters, 30(24), 2003.


The propagation characteristics of the regional Sn shear waves have been mapped to provide insight into the lithospheric structure of the Anatolian and Iranian plateau and the surrounding regions. Thousands of regional earthquakes within the distance range of 2–15 degrees were recorded by broadband and short period stations located in Turkey and nearby regions, especially new data recorded by 29 broadband stations in the Eastern Turkey Seismic Experiment network. The propagation efficiencies of Sn were determined visually using their amplitude and frequency content. Attenuation maps were
then tomographically constructed using the observed propagation efficiencies. Our results confirm that Sn propagates efficiently in the uppermost mantle beneath the Mediterranean Sea, the Black Sea, and the Caspian Sea and along the Zagros fold and thrust belt. Sn is not observed in eastern Turkey, northwestern Iran, or central Anatolia. In contrast to previous available studies, this study considerably improved the mapped location of the boundaries between the zones of efficient and attenuated Sn. Our results are best explained by an absence of lithospheric mantle, or the presence of thin and hot lithospheric mantle beneath most of the Anatolian and Iranian plateau.

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Copyright Statement

An edited version of this paper was published by AGU. © 2003 American Geophysical Union.

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Key Figures and Captions

Figure 4. (a) Map showing Sn efficiency tomography results. Green lines are major tectonic boundaries and coast lines, black lines are national boundaries. (b) Resolution test using a synthetic checkerboard for extinction path length of 350 km (Q = 100).

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