Examining several edge detection techniques in gravity method together with 3D bedrock topography: A case study from the northern part of the Izmir/Turkey


Ulugtekin M., GÖNENÇ T., ÖZDAĞ Ö. C.

JOURNAL OF EARTH SYSTEM SCIENCE, vol.131, no.3, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 131 Issue: 3
  • Publication Date: 2022
  • Doi Number: 10.1007/s12040-022-01891-4
  • Journal Name: JOURNAL OF EARTH SYSTEM SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Environment Index, Geobase
  • Keywords: Bouguer gravity, edge detection, Foca, Aliaga, Menemen Basin, Bakircay graben, 3D bedrock topography, WESTERN TURKEY, ANALYTIC SIGNAL, MENDERES MASSIF, MAGNETIC DATA, ANATOLIA, EVOLUTION, BASIN, TILT, BOUNDARIES, TECTONICS
  • Dokuz Eylül University Affiliated: Yes

Abstract

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.