Factors Controlling the Evolution of Anatolia Clues from Teleseismic Finite Frequency Tomography

Date

2010-12-13

Author

Biryol, C. Berk
Beck, Susan L.
Zandt, George
Özacar, Atilla Arda

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The complex and sinusoidal pattern of subduction zones of the Mediterranenan region plays an important role in controlling the current tectonic framework of the Alpine-Himalayan orogenic belt. The Anatolian region is part of this belt and it displays the complex characteristics of the interplay between continent collision in the east and subduction-rollback related backarc extension in the west. The ongoing northward subduction of the African Plate beneath the Anatolian Plate contributes significantly to the emergence of the current tectonic setting of this region. Despite its crucial effect on the tectonics of Anatolia, there are only a few studies that focus on the deeper extent of this zone. In this study we provide higher resolution tomographic images of the subducting African lithosphere beneath Anatolia. Our approach is based on analysis of teleseismic body-wave travel-time data using a finite-frequency seismic tomography algorithm. The data for our analysis comes from multiple permanent and temporary networks deployed in the region. A major part of our dataset is formed by the multiple frequency-band picks of P-wave arrival times recorded at more than 100 broadband and short-period seismic stations of the National Earthquake Monitoring Center and 39 broadband seismic stations of the North Anatolian Passive Seismic Experiment network. The results of our analysis indicates the presence of large and smaller scale gaps in the subducting African Lithosphere, that are interpreted as slab tears. The most significant tear is located beneath western Anatolia with a maximum width of ~250 km. This tear is marked by lack of intermediate to deep seismicity and is associated with slow seismic speed perturbations that we interpret as ascending hot, buoyant asthenosphere. The configuration of the edges of this gap at depths between 50 to 200 km provides clues about how the impediments on the subducting seafloor could have an influence on rates of roll-back on both sides, and initiation of this tear. The proposed obstruction of subduction on the south side of Cyprus island by the Eratosthenes Seamount might be a present day example of such a situation.

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http://abstractsearch.agu.org/meetings/2010/FM/sections/T/sessions/T23C/abstracts/T23C-2283.html
https://hdl.handle.net/11511/94668

Conference Name

American Geophysical Union (AGU) 2010 Fall Meeting

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Department of Geological Engineering, Conference / Seminar

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Citation Formats

C. B. Biryol, S. L. Beck, G. Zandt, and A. A. Özacar, “Factors Controlling the Evolution of Anatolia Clues from Teleseismic Finite Frequency Tomography,” presented at the American Geophysical Union (AGU) 2010 Fall Meeting, San-Francisco, Kostarika, 2010, Accessed: 00, 2021. [Online]. Available: http://abstractsearch.agu.org/meetings/2010/FM/sections/T/sessions/T23C/abstracts/T23C-2283.html.