Abstract
This paper presents the modeling of 2D CSAMT responses generated by horizontal electric dipole using the separation of primary and secondary field technique. The primary field is calculated using 1D analytical solution for homogeneous earth and it is used to calculate the secondary electric field in the inhomogeneous Helmholtz Equation. Calculation of Helmholtz Equation is carried out using the finite element method. Validation of this modeling is conducted by comparison of numerical results with 1D analytical response for the case of homogeneous and layered earth. The comparison of CSAMT responses are also provided for 2D cases of vertical contact and anomalous conductive body with the 2D magnetotelluric (MT) responses. The results of this study are expected to provide better interpretation of the 2D CSAMT data.
Highlights
The Controlled Source Audio Magnetotelluric (CSAMT) method was introduced by Goldstein and Strangway [1] who performed the method in the field with massive sulphide anomaly
This paper presents the modeling of 2D CSAMT responses generated by horizontal electric dipole using the separation of primary and secondary field technique
Calculation of Helmholtz Equation is carried out using the finite element method
Summary
The CSAMT method was introduced by Goldstein and Strangway [1] who performed the method in the field with massive sulphide anomaly. Bartel and Jacobson [7] used the method to determine the depth and nature of volcanic thermal anomalies using the electric properties, and suggested the correction of CSAMT data in order to fulfill the plane wave assumption. The response function of CSAMT modeling is based on assumption that the source of electromagnetic field (EM) used is in the form of the plane wave. The assumption can be fulfilled only when the measurement of CSAMT data is conducted on the radiation zone, which is around five times the “skin depth” of EM wave under consideration [2,3,8]. The assumption often can not be fulfilled due to various constraints, such as the limitations of resources and the complexity of the local topography This conditions makes the measurement cannot be conducted on the radiation zone. The finite element approach used in this paper is the Ritz method, a variational method in which the boundary value problem is formulated in terms of variational expression [21]
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