Interpretation of gravity anomalies to delineate some structural features of Biga and Gelibolu peninsulas, and their surroundings (north-west Turkey)

Abstract

On the basis of gravity data, derived anomaly traces were presented for the interpretation of some shallow structural features of Biga and Gelibolu peninsulas. Since building general understanding of subtle details about subsurface geology is of great importance considering that the study area is tectonically important, some advanced data processing techniques were implemented to gravity anomalies in a detailed manner. The procedures were performed using a MATLABbased software package (Gravity and Magnetic Interpretation -GMINTERP). First, a finite element method was utilised to produce the residual data-set which is expected to reflect short wavelength anomalies arising from shallower geological structures, and thereafter some derivative-based algorithms were executed to analyse the residual data. The general anomaly patterns obtained from the applications clearly corresponded to the well-known surface geology map of the study area. Derivative-based anomaly maps put forward some findings about the existence of an old caldera structure in the western part of the Biga Peninsula. Additionally, abrupt lateral changes in anomaly amplitudes indicated the presence of some major structural discontinuities. Thus, findings yielded to make significant geological interpretations that might be important for further investigations. This study also showed that GMINTERP software package proved useful in assisting geological interpretation using geophysical potential field data-sets.

MATLAB-based algorithm to estimate depths of isolated thin dike-like sources using higher-order horizontal derivatives of magnetic anomalies

“…Hence, depending on the objectives of analyses and studies, many processing techniques have been reported for interpreting potential field anomalies. If potential field data quality permits, numerous analysing procedures can be conducted that facilitate in building a general understanding of the details of causative bodies (Ekinci and Yiğitbaş 2012 , 2015 ; Balkaya et al 2012 ; Ekinci et al 2013 , 2014 ).…”

3D Modeling and Tectonic Interpretation of the Erzincan Basin (Turkey) using Potential Field Data

“…The subtle details in the potential field anomaly maps can be made more visible through some derivative based filters (Ekinci and Yigitbas, 2012and 2015, Ekinci et al 2013. Many boundary detection filters have been proposed to determine the boundaries of potential field sources.…”

Mapping magnetic lineaments and subsurface basement beneath parts of Lower Benue Trough (LBT), Nigeria: Insights from integrating gravity, magnetic and geologic data

“…where F is the magnetic field, f and f −1 are the Fourier and inverse Fourier transforms, respectively and |k| is the radial wave number. Here n is the order of the vertical derivative (Blakely 1995;Ekinci et al 2013;Ekinci and Yigitbaş 2015). Figure 6 shows the first vertical derivative (FVD) map of the RTP-TMI of the study area.…”