Ambient Noise Tomography Around the Central North Anatolian Fault Turkey

Date

2008-12-15

Author

Warren, Linda M.
Beck, Susan L.
Biryol, C. Berk
Zandt, George
Özacar, Atilla Arda
Yang, Yingjie

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In eastern Turkey, the ongoing convergence of the Arabian and African plates with Eurasia has resulted in the westward extrusion of the Anatolian plate. The North Anatolian Fault (NAF), which forms the northern margin of the Anatolian plate, appears to be a nascent continental transform plate boundary. To study the evolution of such a plate boundary, both at the surface and at depth, we deployed a network of 39 broadband seismometers around the central portion of the NAF from July 2006 through April 2008. We use continuous data from this network and regional stations to image crust and uppermost mantle structure with ambient noise tomography. We compute daily cross-correlations of noise records between all station pairs and stack them over the entire duration of the experiment, as well as in seasonal subsets, to obtain interstation Green's functions. After selecting station pairs with high signal-to-noise ratios and measuring interstation phase velocities, we compute phase velocity maps at periods ranging from 8--35 s. At periods sensitive to crustal structure (T < 20 s), the phase velocity maps highlight fault structures. The region immediately around the NAF has high velocities and the region to the south, between the NAF and the Ezinepazari Fault Zone, has low velocities. In contrast, at longer periods, which have maximum sensitivity in the uppermost mantle, the phase velocity maps show a different pattern: the maps are dominated by a northwest-to-southeast decrease in phase velocities. At all periods, the phase velocity maps are similar for winter and summer subsets of the data, indicating that seasonal variations in noise sources do not bias our results.

URI

http://abstractsearch.agu.org/meetings/2008/FM/sections/T/sessions/T21A/abstracts/T21A-1914.html
https://hdl.handle.net/11511/94692

Conference Name

American Geophysical Union (AGU) 2008 Fall Meeting

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Department of Geological Engineering, Conference / Seminar

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Citation Formats

L. M. Warren, S. L. Beck, C. B. Biryol, G. Zandt, A. A. Özacar, and Y. Yang, “Ambient Noise Tomography Around the Central North Anatolian Fault Turkey,” San-Francisco, Kostarika, 2008, vol. 89, Accessed: 00, 2021. [Online]. Available: http://abstractsearch.agu.org/meetings/2008/FM/sections/T/sessions/T21A/abstracts/T21A-1914.html.