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This paper presents a comparative study of two different forward methods such as the space domain method and the frequency domain method. The performance of each method was evaluated on two synthetic models. Finally, the more effective method was applied to calculate Bouguer gravity anomaly in the East Vietnam Sea and adjacent areas using the latest available dataset from the TOPEX mission. | VNU Journal of Science Mathematics Physics Vol. 36 No. 3 2020 106-114 Original Article A Comparative Study on Two Different Methods for Calculating Gravity Effect of an Uneven Layer Application to Computation of Bouguer Gravity Anomaly in the East Vietnam Sea and Adjacent Areas Luan Thanh Pham Faculty of Physics VNU University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 26 April 2020 Revised 06 May 2020 Accepted 20 June 2020 Abstract Calculation of gravity anomaly caused by an uneven layer is essential for quantitative interpretation. By comparing calculated anomalies with observed anomalies we may infer some parameters of subsurface structures. There are many different methods for computing gravity effect of an uneven layer. This paper presents a comparative study of two different forward methods such as the space domain method and the frequency domain method. The performance of each method was evaluated on two synthetic models. Finally the more effective method was applied to calculate Bouguer gravity anomaly in the East Vietnam Sea and adjacent areas using the latest available dataset from the TOPEX mission. Keywords Forward method space domain frequency domain Bouguer gravity anomaly Vietnam. 1. Introduction The purpose of gravity methods in natural resources exploration is to determine the geometric parameters of the density structures including depth slope lateral boundaries etc 1-7 . Knowledge of the parameters of the gravity sources can be important for optimizing drilling operations as well as estimating mineral deposits 8-10 . The gravity anomalies can be calculated from known or assumed information and then compared with measured gravity anomalies to determine some source parameters. A range of different methods have been developed to calculate gravity anomalies caused by density structures. The methods can generally be divided into two main groups namely the space ________ Corresponding author. Email address luanpt@hus.edu.vn https .
