TITLE:
Equivalent-Source from 3D Inversion Modeling for Magnetic Data Transformation
AUTHORS:
Hendra Grandis
KEYWORDS:
Potential-Fields; Equivalent-Layer; Non-Uniqueness; Ambiguity; RTP; RTE; Upward Continuation
JOURNAL NAME:
International Journal of Geosciences,
Vol.4 No.7,
September
9,
2013
ABSTRACT: The well-known non-uniqueness in modeling of
potential-field data results in an infinite number of
models that fit the data almost equally. This non-uniqueness concept is exploited to devise a method to transform
the magnetic data based on their equivalent-source. The unconstrained 3D magnetic
inversion modeling is used to
obtain the anomalous sources, i.e. 3D magnetization distribution in the subsurface. Although the
3D model fitting the data is not geologically feasible, it can serve as
an equivalent-source. The transformations, which are commonly applied to magnetic data
(reduction to the pole, reduction to the equator, upward and downward continuation), are the
response of the equivalent-source with appropriate kernel functions. The application of the method to both synthetic and field data
showed that the transformation of magnetic data using the 3D equivalent-source gave satisfactory results. The method is relatively more stable than the filtering technique, with respect to the noise
present in the data.