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GRAVİTE VERİLERİNİN TEKİL DEĞER AYRIŞTIRMA YÖNTEMİYLE TERS ÇÖZÜMÜ VE GEDİZ VE BÜYÜK MENDERES GRABENLERİNİN TORTUL KALINLIKLARININ SAPTANMASI

INVERSION OF GRAVITY DATA USING SINGULAR VALUE DECOMPOSITION TECHNIQUE AND DETERMINATION OF THE SEDIMENT THICKNESSES OF THE GEDIZ AND BUYUK MENDERES GRABENS

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Abstract (2. Language): 
Inversion of gravity anomalies consists of some mathematical and statistical operations on the data to generate the most suitable geophysical model approximating the subsurface geological structure. The initial values of the model parameters are assumed approximately in the inversion procedure. The initial values of model parameters are improved iteratively based on the differences between the observed anomalies and theoretical anomalies caused by the model structure.Rrecently, the processes of the chancing parameter values, making a decision for the data fitting, closeness between the determined and true parameter values and determination of the relationship level between parameter values are realized by the computer algorithms. In this study, the two Bouguer gravity profiles crossing the Gediz and Büyük Menderes grabens are evaluated by the damped least squares method using singular value decomposition (SVD) technique. As a result of the applications, thickness of the sedimentary fill in both grabens are estimated about 1.5 km for Büyük Menderes graben and about 2.0 km for Gediz graben.
Abstract (Original Language): 
Gravite anomalilerinin ters çözümü yeraltındaki jeolojik yapıya en uygun jeofizik modeli üretmek amacıyla verilere uygulanan matematiksel bir işlemden oluşmaktadır. Bir ters çözüm işleminde yapı parametrelerinin başlangıç değerleri yaklaşık olarak kabul edilir. Gözlenen anomali ile model yapının neden olduğu kuramsal anomali arasındaki farklara dayanılarak başlangıç parametre değerleri yinelemeli olarak düzeltilerek yapıyı en iyi simgeleyen parametre değerleri saptanır. Günümüzde, ters çözüm uygulamalarında parametre değerlerinin değiştirilmesi, çakışmanın oluştuğuna karar verilmesi, saptanan parametrelerin gerçek değerlere yakınlığı ve parametre değerleri arasındaki ilişkilerin düzeyinin belirlenmesi işlemler bilgisayar algoritmaları ile gerçekleştirilmektedir. Bu çalışmada, Gediz ve Büyük Menderes grabenlerini kesen iki Bouguer gravite profili iki boyutlu çokgen bir model yardımıyla sönümlü en küçük kareler yöntemine tekil değer ayrıştırma tekniği uygulanarak değerlendirilmiştir. Uygulamalar sonucunda grabenleri dolduran tortulların kalınlığının Büyük Menderes grabeni için 1.5 km civarında, Gediz grabeni için ise 2.0 km civarında olduğu saptanmıştır.
FULL TEXT (PDF): 
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