Crustal and Isostasic Model for North-West of Iran Plateau Using Gravity Data

A new 3-D crustal model for North-West of Iran Plateau is presented base on the improved gravity database. The area consists of flat and mountainous regions. The Bouguer anomaly variations are of the order of more than three hundreds of miligals. In order to calculate the isostasic gravity residual a crustal model is assessed using the terrain model of the region. The higher frequency of the gravity signal and the terrain model are filtered using 2d discreet wavelet analysis. The thickness of the zero level roots is estimated by comparing with the new crust model. The synthetic gravity for the A-H model is calculated by Forsberg formula. Subtracting the synthetic gravity from the measured gravity, the isostasy residual anomaly for the region is calculated. Large positive anomalies are observed in Alborz mountains.