Investigation of geodynamical structures of the aegean region
Başlık çevirisi mevcut değil.
- Tez No: 35916
- Danışmanlar: DOÇ. DR. MUSTAFA ERGÜN
- Tez Türü: Doktora
- Konular: Jeofizik Mühendisliği, Geophysics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1994
- Dil: İngilizce
- Üniversite: Dokuz Eylül Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Jeofizik Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 201
Özet
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Özet (Çeviri)
SUMMARY Western Turkey and the surrounding region form one of the most rapidly deforming continental regions. It displays several very interesting geophysical and geological features, such as seismic and volcanic activity including high heat flow, intense faulting and folding, rapid spatial variations of the gravity and magnetic field, etc. The kinematics of the deformation are controlled by three factors: The westward motion of Turkey relative to Europe; the continental collision between NW Greece-Albania and the Apulia-Adriatic platform in the west, and the presence of the Hellenic subduction zone to the south. Many models have been suggested to account for this region, and whilst there is now broad agreement as to the nature of many detailed features. Early models, which treated the region in terms of plate tectonics as a boundary between several plates, have been superseded by models that treat it, on the largest scale, as a deforming continuum. Continental extension in a N-S direction is occurring across Western Turkey and Aegean Sea. Folating and Pinned models were proposed by McKenzie and Jackson illustrate possible relationships between fault movement and block rotations in a zone of disturted deformation in continental areas. In addition the these studies, in order to explain structural problems of Western Turkey, Bouguer gravity and Magsat data were interprated. Vertical component magsat data were modelled using global crust model. Generally, the Western Turkey are identified negative Bouguer gravity anomalies. Aegean sea is characterized by positive anomalies. As a result of gravity modelling, the Aegean sea and Western Turkey are proved to be floored by continental crust and there is a mantle rise in the Aegean Sea and Western Turkey. It can be said that the volcanic arc in the Aegean Sea also continues in the Western Turkey. First GPS results were obtained from observations conducted by MIT (USA) between 1988 and 1992 in Turkey. MIT included, in GPS analysis, 5 sites observed by ETH-Z in the Marmara network in 1990 and 1992, and four sites observed by Durham in 1989. In 1992, some sites of this network were observed by both IFAG and MIT. The data between 1988-1992 have been processed using Gamit Software by MIT. According to these result, relative site motions obtained from GPS measurements between 1988-1992 indicate four major domains each having distinct kinematics: The Pontus block, the Anatolian and the Arabian plates, and the Caucasus. The most prominent feature in the velocity field is the Anatolian plate, which is separated from neigboring by major strike-slip and subduction zones. The northern boundary of the Anatolian plate is clearly defined by NAF in the Marmara Sea and the northern Aegean trough are likely to represent the boundaries further to the west. Hellenic arc marks the southern boundary of the Anatolian plate. In the east, the Anatolian plate is separated from the Anatolian plate by the East Anatolian Fault (EAF). GPS result does not illustrate a distinct boundary between the previously recognized Turkish or Anatolian and the Aegean block. Analysis of GPS data show a 25±9 mm/yr right lateral motion across the NAF a 50±20 mm/yr southwest of Aegean relative to Eurasia. Though relatively large uncertainties make it hard to resolve the N-S extension in Western Turkey, initial results suggest a 10 mm/yr motion. Actual geodetic observations is not enough to explain continental deformation in Western Turkey. Better estimates may be reached after next GPS measurements and inclusions of IFAG results.
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