Interpretation of the Geomorphological Development of the Volcanic Field in the South and Southwest of Isparta with Lineament and Circularity Analysis

Yıl 2019, Sayı: 2, 23 - 36, 15.04.2019

Ergin Canpolat Hüseyin Turoğlu

Öz

The research area is one of the young volcanic fields in Anatolia which is located in Isparta city and vicinity. The high field, which borders the Isparta plain from South, Southwest and partly the West, is the result of Plio-Quaternary volcanism. The andesite and trachyandesitic lavas, which were exposed by explosive volcanism in different phases, did not move further away from the exit centers and it formed a high mass by accumulating layer by layer. During the volcanic activity, along with the lava, there were also outlets of pyroclastic material in almost every period of volcanism. The thickness of the pyroclastic layers decreases as they move away from the center of the volcanism. The pyroclastics spread over a wide area which is seen in the sequences of sediment accumulating at distances as long as 45-50 km from the center of volcanism. Andesitic and pyroclastic cones, calderas and dykes are common landforms of very young volcanic topography in the region. In this study; according to the results of lineament and circularity analysis, it was aimed to determine, diagnose and map the geomorphological features of the volcanic field outlined above. For this purpose, through using Geographic Information Systems (GIS) and Remote Sensing (UA) Technologies; Relative Topography Position Index, Curvature Analysis, Lineament Analysis, Circularity analysis were performed. For these analyses, data were generated from LandSat TM, SRTM, ASTER-DEM satellite images and 1/25 000 topography maps. The results of the morphometric analysis have enabled the identification, recognition and mapping of the land forms of the volcanic topography, which are characterized by linear ridges, concave and convex slopes in the studied field. The results were tested and verified in the field.

Anahtar Kelimeler

Morphometric anlysis, Gölcük Caldera, Volcanism, Isparta

Isparta Güneyi ve Güneybatısındaki Volkanik Sahanın Jeomorfolojik Gelişiminin Çizgisellik ve Dairesellik Analizleri ile Yorumlanması

Öz

Araştırma alanı, Isparta
kenti ve çevresinde bulunan Anadolu'daki genç volkanik alanlardan biridir. Isparta
ovasını Güney-Güneybatı ve kısmen Batıdan sınırlayan yüksek saha,
Pliyo-Kuvaterner volkanizmasının sonucudur. Farklı evrelerde gerçekleşen
patlama karakterli volkanizma ile yüzeylenen andezit, trakiandezit lavlar çıkış
merkezlerinden fazla uzaklaşmayarak üst üste birikmiş ve yüksek kütleleri
oluşturmuştur. Volkanik faaliyet sırasında lav ile birlikte hemen her dönemde
piroklastik malzeme çıkışları da olmuştur. Piroklastik tabakalarının
kalınlıkları, volkanizma merkezinden uzaklaştıkça azalır. Geniş alana yayılan
piroklastiklere; volkanizma merkezinden 45-50 km gibi uzak mesafelerdeki
sedimanter depolarda, 5-6 cm kalınlığında istifler halinde rastlanmaktadır. Andezitik
ve piroklastik koniler, kaldera ve dayklar; bölgedeki çok genç volkan
topografyasına ait yaygın yer şekilleridir. Bu çalışmada; çizgisellik ve
dairesellik analiz sonuçlarına göre ana hatları yukarıda özetlenen volkanik
sahanın jeomorfolojik özelliklerine ait tespit, tanı ve haritalarının yapılması
hedeflenmiştir.

Bu amaç için Coğrafi
Bilgi Sistemleri (CBS) ve Uzaktan Algılama (UA) Teknolojileri kullanılarak; Göreceli
Topoğrafik Konum İndisi, Eğrilik Analizi, Çizgisellik, Dairesellik analizleri
yapılmıştır. Bu analizler için LandSat TM, SRTM, ASTER-DEM uydu
görüntülerinden, 1/25 000 ölçekli topografya haritalarından veri üretilmiştir.

Morfometrik analizlere
ait sonuçlar; çalışma sahasındaki çizgisel sırtlar, içbükey ve dışbükey yamaçlar
ile belirginleşen volkan topografyasına ait yer şekillerinin tespitine,
tanınmasına ve haritalanmasına imkân vermiştir. Sonuçlar arazide test edilerek,
doğrulanmıştır.

Anahtar Kelimeler

Gölcük Kalderası, Volkanizma, Morfometrik Analiz, Isparta

Kaynakça

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