Shallow and Deep Structure of a Supradetachment Basin Based on Geological,Conventional Deep Seismic Reflection Sections and Gravity Data in the Buyuk Menderes Graben,Western Anatolia |
| |
| Authors: | G Çifçi O Pamukçu C Çoruh S Çopur H Sözbilir |
| |
| Institution: | 1.Institute of Marine Sciences and Technology,Dokuz Eylül University,Inciralt?, Izmir,Turkey;2.Engineering Faculty, Department of Geophysics,Dokuz Eylül University,Izmir,Turkey;3.Department of Geological Sciences,Virginia Polytechnic Institute and State University,Blacksburg,USA;4.Turkish Petroleum Co., Exploration Group,Ankara,Turkey;5.Engineering Faculty, Department of Geology,Dokuz Eylül University,Izmir,Turkey |
| |
| Abstract: | The Buyuk Menderes Graben is a depression in the Menderes core complex of western Turkey. The region is one of the most rapidly
deforming regions of continental crust in the world and has exceptionally high seismic activity. In this study, shallow and
deep seismic studies were conducted at the Buyuk Menderes graben. These studies included surface geological mapping and two
seismic reflection sections. Detailed modelling was performed with the seismic study. In addition to these, a moving windows
power spectrum was applied to the Bouguer gravity profile data of the study area. Since no deep well is available in this
area, the geological interpretation of the seismic stratigraphy is based on the correlation with the surface geology, this
was combined with the major reflections and the seismic facies observed along the profiles, and, thus, four main seismic units
can be distinguished in the basin fill. Structural features of the basin is driven by a complex extensional faults system,
consisting of a low-angle, S-dipping Buyuk Menderes detachment and by its synthetic and antithetic splays, bordering the opposite
flanks of the basin. As a result of conventional deep seismic reflection sections and gravity data, three layers were defined
in the study area. The first layer occurs at a thickness of 6 km, and the second layer is between 13 and 18 km. The third
layer is at ~33 km and may also emphasize Moho depth. The Buyuk Menderes graben has three clear reflectors which are base
sediments, brittle-ductile transition, Moho and faults that show a half-graben floored by a detachment. The Moho depth is
comparable with previous estimates. According to the results obtained, Bouguer gravity and seismic results are very much consistent
with each other. It was observed that at the depths determined from seismic and gravity data, the distribution percentage
of earthquake focal depths also rises. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
