| Popis: |
To determine the location and extent of buried geological structures, evaluation of gravity potential field data using edge detection methods is widely used, such as total horizontal derivative, tilt angle, the vertical derivative's tilt angle and analytical signal methods. In the interpretation process of anomalies obtained from these methods, users do need additional physical parameters. So, in the first step of this study, results of the edge detection methods have been examined via synthetic models to put forward the availabilities of each method. Synthetic data studies show that the increase in noise level plays a direct role in determining the structure boundaries. The results obtained from the tilt angle application for high noise ratios give more inadequate results than other applications. Especially for high noise ratios, the most accurate structure boundaries are obtained with the total horizontal derivative (THD) applications. The data collected from Dikili, candarli, Foca regions at 840 stations showed the presence of five remarkable Bouguer gravity anomaly localizations in the part of Bakircay and Gediz graben. After that, according to the obtained findings, the methods have been applied to the field data and discussed. The location of the alluvial reservoir between Foca and Menemen was able to detect residual complete Bouguer anomaly map, candarli volcanic intrusion is clearly seen on THD and analytical signal (AS) maps, Foca volcanics and Dumanlidag volcanic center were detected on tilt angle (TA) map. All these outputs of the area were interpreted in the scope of geological literature. Finally, these results were examined by combining them with the obtained 3-dimensional bedrock topography. 3-D bedrock inversion results clearly showed that the volcanic intrusion at the candarli region is a reason for the recent topographical shape of the area, which also helps us to define the surface of the Bakircay Graben's related to hanging wall and its slope changes. |
