Application
of boundary analysis and modeling methods on Bouguer gravity data of the Gediz
Graben and surrounding area in Western Anatolia and its tectonic implications
Şenol
Özyalın1, Oya Pamukçu1*, Tolga Gönenç1,
Ayça Yurdakul1 and Hasan Sözbilir2
1
Dokuz Eylül
University, Engineering Faculty, Department of Geophysics, Buca Tınaztepe
Campus, Buca/Izmir,
Turkey
2 Dokuz Eylül University, Engineering Faculty, Department of Geology,
Buca Tınaztepe Campus, Buca/Izmir,
Turkey
(*oya.pamukcu@deu.edu.tr
)
(
Received
24 May
2012; accepted 10 October
2012)
Abstract:
Western
Anatolia
has been deformed by disintegrating under the
effect of N-S oriented tensile forces since the Miocene. As a result of this
deformation, many depressions have developed in NE-SW and E-W directions. These
are Gediz and Büyük Menderes Grabens in E-W direction and Gördes, Selendi and
Demirci basins towards north orienting in NE-SW direction. The relation of these
basins, developing in the different directions, has been widely discussed. In
order to determine the extensions, continuities and depth variations of these
intersecting structures, boundary analysis and basement topography methods were
applied to the Bouguer gravity data. By using obtained parameters, graben
structures were modeled according to the Talwani method. As a result of basement
topography and modeling studies, average thickness of the basin fill units
varies from about 2 km to about 3 km in the Gediz Graben, and 3-4 km in the
middle parts. According to the boundary analysis method, the Gördes, Demirci
and Selendi basins at the north continue within the Gediz Graben towards the
south. These findings also prove the existence of NE-SW oriented grabens
developed in Early Miocene, within the E-W oriented Gediz Graben.