Numerical modeling of present-day stress field and deformation pattern in Anatolia

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The present-day stress field in the Earth's crust is important and provides insights into mechanisms that drive plate motions. In this study, an elastic plane stress finite element modeling incorporating realistic rock parameters have been used to calculate the stress field, displacement field and deformation of the plate interactions in Anatolia. Modeled stress data for the African-Arabian-Anatolian plate interactions with fixed Eurasian platform correlate well with observed stress indicator from the world stress map (WSM) and focal mechanism of earthquakes; while displacement field agree qualitatively well with GPS vectors and sense of motion indicated by focal mechanisms for large crustal earthquakes (M＞6) and plate motion models. Modeling result shows the direction of maximum horizontal compressive stress (σ_<Hmax>) toward the direction of absolute motion of these plates. Large perturbations in σ_<Hmax> orientations are shown to occur in and around tectonic boundaries between those plates. It is observed that, although the African plate acts mostly as indenter, which transmits the collisional motion from the Arabian plate to the Anatolian plate, in the current situation the far-field stress probably from the Hellenic subduction is needed to satisfy the present-day stress field in Anatolia.

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