The various data processing techniques, to illuminate the parameters of the geological structure which are applied in gravity and magnetic potential field methods. Also edge detection procedures are in data processing techniques. In this study, 2D, 3D, inversion and asta technique is one of the new edge detection procedures were applied to clarify correlation between the Simav half graben's deep position and geometry of the tectonic lineaments. The Asta is obtained using the tilt angle. Bulletin of the Mineral Research and Explorationhttp://bulletin.mta.gov.tr

When processing gravity data, the fi lters are used in space and frequency environments. The fi lters allow more selectable parameter estimations than raw data about the structure being examined. Filtering in a broad sense means monitoring the data under the constraints we want. While the fi lters allow some information to become more noticeable, they allow some information to be lost or become less noticeable from data. In this case, the losses in the data make the interpretation diffi cult and can cause errors. Derivative and phase fi lters provide quantitative information about the variation of data in different directions. The display of the change results in a positive or negative manner proportional to derivative sensitivity and phase sharpness, and this may be observed in this data. In the structural boundary analysis, since the sudden changes in the derivative cause oscillations, the boundaries become questionable. Limiting the data neighborhoods with a window by controlling the deviation without using derivative and the fi lters that allow boundary analysis non-derivative by fl oating this limitation are used to illuminate the boundary relationships.

The various data processing techniques, to illuminate the parameters of the geological structure which are applied in gravity and magnetic potential field methods. Also edge detection procedures are in data processing techniques. In this study, 2D, 3D, inversion and asta technique is one of the new edge detection procedures were applied to clarify correlation between the Simav half graben's deep position and geometry of the tectonic lineaments. The Asta is obtained using the tilt angle.

The gravity data gathered in and around the Simav Graben in Western Anatolia were reprocessed and reinterpreted by using the standard deviation fi lter and the Euler deconvolution. The joint evaluation of results from the interpretation of gravity data and seismological studies indicates the presence of new intrusive structures in the vicinity of Simav. The intrusion is located in the eastern margin of the graben and has a thickness of 12-15 km at 2.5-3 km depth below the surface. Numerous earthquakes recorded in the eastern part of the graben are associated with this intrusion. Besides, the multidimensional modelling study of the gravity data allowed us to display the Simav Graben, the fold of the Simav Fault, the intrusion named as Naşa, and the epicenters of earthquake within the same tectonic frame. All tectonic structures were marked on the three dimensional relief model.

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