Upper Crustal Structure of Denizli Graben (Western Turkey) From Bouguer Gravity Data and Seismic Reflection Sections


ERBEK KIRAN E., ATEŞ A., DOLMAZ M. N.

SURVEYS IN GEOPHYSICS, vol.43, no.6, pp.1947-1966, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Review
  • Volume: 43 Issue: 6
  • Publication Date: 2022
  • Doi Number: 10.1007/s10712-022-09736-x
  • Journal Name: SURVEYS IN GEOPHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, Communication Abstracts, Compendex, Geobase, INSPEC, Civil Engineering Abstracts
  • Page Numbers: pp.1947-1966
  • Keywords: Bouguer gravity anomalies, Denizli graben, 3D modelling, Seismic section, RADIOGENIC HEAT-PRODUCTION, ALPINE-HIMALAYAN BELT, AEROMAGNETIC DATA, MENDERES MASSIF, EXTENSIONAL TECTONICS, THERMAL STRUCTURE, ACTIVE TECTONICS, AEGEAN REGION, SW-ANATOLIA, BASIN
  • Süleyman Demirel University Affiliated: Yes

Abstract

The defining of upper crustal structures is an essential process for understanding the tectonic evolution and geodynamics of a region. In this context, the paper aims to determine basement depth and upper crustal structures through the Bouguer gravity anomalies and seismic reflection sections in Denizli Graben located in the western part of Turkey. The gravity data have been analyzed using the power spectrum technique. The results from this technique show that the average Moho depth, basement depth of the middle layer, and the depth of sediment basin in the region have been calculated as 33.6, 12.8, and 3.9 km, respectively. Furthermore, the Moho depth of the region has been estimated using gravity anomalies and is computed to be about 33 km in Denizli Graben. As such, it is shown that the depth values obtained from power spectrum analysis and Moho depth calculations are consistent with each other. Bouguer gravity anomalies have been also modeled three-dimensionally (3D). In the model map, the basement depth of the Denizli Graben has been calculated as approximately 9-10 km. Besides these, by interpreting the seismic section, the depth of the interface in the Denizli Graben has been obtained as approximately 2634 m for one-way travel time. This depth is quite shallow compared to the one (i.e., around 10 km) obtained from the gravity model. Thus, the interface seen in the seismic section is not considered to be the deepest part of the Denizli Graben. From the geothermal and oil exploration perspectives, the obtained basement and interface depths are quite beneficial, especially for the drilling planning.