Rapid least‐squares inversion of apparent resistivity pseudosections by a quasi‐Newton method1

Geophysical Prospecting - Tập 44 Số 1 - Trang 131-152 - 1996
M.H. Loke1, R. D. Barker2
1School of Physics, Universiti Sains Malaysia, 11800 Penang, Malaysia. Forrnerly at
2School of Earth Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, Kingdom.

Tóm tắt

AbstractA fast inversion technique for the interpretation of data from resistivity tomography surveys has been developed for operation on a microcomputer. This technique is based on the smoothness‐constrained least‐squares method and it produces a two‐dimensional subsurface model from the apparent resistivity pseudosection. In the first iteration, a homogeneous earth model is used as the starting model for which the apparent resistivity partial derivative values can be calculated analytically. For subsequent iterations, a quasi‐Newton method is used to estimate the partial derivatives which reduces the computer time and memory space required by about eight and twelve times, respectively, compared to the conventional least‐squares method. Tests with a variety of computer models and data from field surveys show that this technique is insensitive to random noise and converges rapidly. This technique takes about one minute to invert a single data set on an 80486DX microcomputer.

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Geophysical Prospecting

Tập 44 Số 1

131-152

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