Indian Journal of Science and Technology

Abstract

Thickness determination of the crust using gravity data is one of the fundamental researchers in the earth sciences and Geodesy. Moho depth represents a major change in seismic velocities, the chemical compositions and lithology and its depth is used in determining of overall structure of the crust and zone tectonic. The purpose of this study is to determine the crust thickness of the Kopeht Dagh region that for this aim was used the terrestrial gravity data of Iran’s National Cartographic Center (NCC) and Bureau Gravimetrique International (BGI). First was calculated free air anomaly, simple bouguer correction and topographic correction and through them was calculated complete bouguer anomaly to determine crustthickness by using gravity data. Complete bouguer anomaly information entered in inversion process in the frequency space with Parker – Oldenburg method and thus was calculated Moho depth for desired region. We observe about 200 mlGal positive free air anomaly in high areas and about -42 m gal negative free air anomaly in low-lying areas in Iran. According to the results of this research for tectonic zone of Kopeht Dagh was calculated the maximum and minimum of complete bouguer anomaly -83.3 and -216.3 mlGal respectively and finally was determined maximum and minimum of crust thickness 55.9 and 36.6 km in Kopeht Dagh.
Keywords: Anomaly, Bouguer, Crust Thickness, Gravity, Kopeht Dagh