HR: 0800h
AN: GP31A-0077    [Abstracts]
TI: Potential-Field Transformations and Modeling Using Splines
AU: * Wang, B
EM: wang1bingzhu@yahoo.com
AF: Institute of Geophysics, China Seismological Bureau, No. 5, Minzudaxue South Rd., Beijing, 100081 China
AB: Potential-field transformations facilitate geologic interpretations by transforming measured data into new forms. Potential-field modeling is able to construct useful source models that match observed anomalies. The widely used FFT algorithms for transformations and modeling have limitations, however. We advance new unified formulas for interpolation, differentiation and integration using splines and propose new space-domain approaches to 2D and 3D potential-field transformations (e.g., derivative and gradient tensor calculations, pseudomagnetic calculation, pseudogravity transformation, reduction to the pole, potential calculations, upward and downward continuation) and modeling of complex arbitrary-shaped heterogeneous sources. Gravity and magnetic results, synthetic and real, show that the algorithms are correct, noise-tolerative and practical. In the spline algorithms, the spacing can be either regular or irregular. Through comparisons with FFT algorithms, it is found that spline algorithms have higher accuracy and smaller edge effects, and thus provide better insights into understanding the nature of the sources.
DE: 0520 Data analysis: algorithms and implementation
DE: 0903 Computational methods: potential fields (1214)
DE: 0920 Gravity methods (1219)
DE: 0925 Magnetic and electrical methods (5109)
DE: 1517 Magnetic anomalies: modeling and interpretation
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005