Upper crust response to geodynamic processes beneath Isparta Angle, SW Turkey: Revealed by CMT solutions of earthquakes

ÖVER S., ÖZDEN S., KAMACI Z., YILMAZ H., ÜNLÜGENÇ Ü. C., PINAR A.

TECTONOPHYSICS, cilt.687, ss.94-104, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 687
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.tecto.2016.09.001
  • Dergi Adı: TECTONOPHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.94-104
  • Anahtar Kelimeler: Inversion, Stress state, Earthquake, Extension, Isparta Angle, Upwelling asthenosphere, SW Anatolia, CENOZOIC STRESS-FIELD, EXTENSIONAL TECTONICS, MEDITERRANEAN REGION, LITHOSPHERE BENEATH, ACTIVE DEFORMATION, WESTERN ANATOLIA, DINAR EARTHQUAKE, EASTERN ANATOLIA, GPS CONSTRAINTS, ANTALYA BASIN
  • Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet

Özet

The Isparta Angle is an important area of SW Anatolia where extensions in all directions (N-S, NE-SW, NW-SE and E-W) meet These extensions were determined by normal faulting structures as well as by shallow earthquakes. All extensions, except the E-W one, were attributed to the deviatoric stresses in relation to slab forces and/or extrusion of Anatolia. The moment tensor inversion of 40 shallow earthquakes which occurred in the inner part of the Isparta Angle give focal mechanisms mostly indicating normal faulting. Inversion of all focal mechanisms of the earthquakes obtained from the moment tensor inversion yields normal faulting characterized by an approximately E-W (N268 degrees E) sigma(3) axis. The calculated stress ratio R is 0.6944 indicating a triaxial stress state. Commonly accepted geodynamic models for the eastern Mediterranean region do not include plate boundary forces acting in the east or west direction. Our hypothesis is that the cause of the E-W extension is the combined forces of Gravitational Potential Energy and the hot asthenosphere upwelling through a tear fault in the subducted African plate between the Hellenic and Cyprus arcs beneath the Isparta Angle. (C) 2016 Elsevier B.V. All rights reserved.