Mechanisms of Isostasıc compensation in central Anatolian


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Oruç B. , Pamukçu O., Sönmez T., Ulutaş E. , Selim H. H.

ICENS INTERNATIONAL CONFERENCE ON ENGINEERING AND NATURAL SCIENCES, Sarajevo, Bosnia And Herzegovina, 24 - 28 May 2016

  • Publication Type: Conference Paper / Summary Text
  • City: Sarajevo
  • Country: Bosnia And Herzegovina

Abstract

The existence of the earthquake potential of central Anatolian region has been investigated by analyzing the mechanisms of isostatic compensation. Central Anatolia region is located in a large area. It is surrounded by North Anatolian fault zone, East Anatolian fault zone, the Cyprus and Hellenic arcs. Neotectonic regime of the region is consistent with westward escape of Anatolia. The average depths of Lithosphere-Asthenosphere Boundary (LAB) and Moho are respectively constrained at 74 km and 38km from radially logarithmic amplitude spectra of EGM08 Bouguer anomalies. The geometries of LAB and Moho are estimated using the Parker-Oldenburg gravity inversion. The inversion indicates that LAB and Moho increase from west to the east and they are less undulated in the central part of the region. Isostasic Moho based on Local (Airy) and regional isostasy (Vening-Meinesz) model has also been estimated from the isostatic response of vertical loading. Accordingly, there are crustal roots beneath HIGHER surface elevations that cause mass defficiency in the eastern part of the central Anatolia. We observed that regional isostasic Moho conforms slightly with gravimetric Moho. The isostasic compensation rate is defined as the percentage of the difference between isostasic Moho and gravimetric Moho. The decrease in seismic activity in the eastern part of the region where compensation rates are about 100% and the increase in seismic activity in the regions where under compensation rates are less 90%. Our results are well correlated with seismic activities in the region. This study is being supported by TUBITAK, under the project number 115Y217.