Tarihsel Trakya bölgesinde kabuk kalınlığının uydu gravite verileri ile araştırılması

Öz

Bu çalışmada Tarihsel Trakya bölgesi olarak bilinen ve günümüzde Türkiye, Yunanistan ve Bulgaristan sınırları içerisine uzanan coğrafi bölgede yer alan büyük ölçekli jeolojik yapılar gravite yöntemiyle araştırılmıştır. Çalışmanın ilk evresinde, EGM08 uydu gravite verisine uygulanan kenar belirleme teknikleri Trakya kırık kesiminin (Thrace fault zone) Bulgaristan’da Meriç Vadisi havzasına kadar uzandığını ortaya koymuştur. Çalışmanın ikinci evresinde ise önce Fourier dönüşümü kullanan değerlendirme tekniklerinden yararlanarak Bouguer anomalisine neden olan kaynakların derinlikleri kestirilmiştir. Ardından kabuk kalınlığının hesaplanmasına yardımcı olması bakımından Demenitskaya, Woollard ve Woollard-Strange deneysel (ampirik) bağıntıları verilere uygulanmış ve ortalama kabuk kalınlıkları hesaplanmıştır. Sonuçların denetlenmesi için kabuk-manto sınır derinliği hesabında güç spektrumu ve Parker-Oldenburg yöntemleri kullanılmıştır. Deneysel sonuçlarda kabuk kalınlığının 19 km’den 43 km’ye, Parker-Oldenburg yönteminde 20 km’den 40 km’ye ve güç spektrumunda 16 km’den 45 km’ye değişim göstermektedir. Anılan sonuçlara ek olarak kabuk topografyasındaki değişimler petrol ve doğal gaz aramalarında hedef olarak da incelenen büyük ölçekli havzalara ev sahipliği yapabilecek alanlara işaret etmektedir.

Anahtar Kelimeler

• Derinlik
• Gravite
• Moho
• Kenar belirleme
• Tarihi Trakya

The investigation of crustal thickness in the historical Thrace Region using satellite gravity data

Öz

In this study, large-scale geological structures located in the geographical region known as the Historical Thrace region, which today extends within the borders of Turkey, Greece, and Bulgaria, were investigated using the gravity method. In the first phase of the study, edge detection techniques applied to EGM08 satellite gravity data revealed that the Thrace fault zone extends to the Maritsa Valley Basin in Bulgaria. In the second phase of the study, first, the depths of the sources causing the Bouguer anomaly were estimated using evaluation techniques that employ the Fourier transform. Then, to assist in the calculation of crustal thickness, Demenitskaya, Woollard, and Woollard-Strange empirical relationships were applied to the data, and average crustal thicknesses were calculated. To verify the results, power spectrum and Parker-Oldenburg methods were used to calculate the crust-mantle boundary depth. The experimental results indicate that crustal thickness varies from 19 km to 43 km, from 20 km to 40 km in the Parker-Oldenburg method, and from 16 km to 45 km in the power spectrum analysis. In addition to aforementioned findings, variations in crustal topography indicate areas that could host large-scale basins, which are considered targets in oil and gas exploration.

Anahtar Kelimeler

• Depth
• Gravity
• Moho
• Edge detection
• Historical Thrace

Kaynakça

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