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090			_aB-16393
245	1	0	_aRapid least-squares inversion of apparent resistivity pseudosections by a quasi-Newton method
490	0		_vGeophysical Prospecting, 44(1), p.131-152, 1996
520	3		_aA 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.
650	1	4	_aCOMPUTER SIMULATION
650	1	4	_aELECTRIC CONDUCTIVITY OF SOLIDS
650	1	4	_aINVERSE KINEMATICS
650	1	4	_aITERATIVE METHODS
650	1	4	_aLEAST SQUARES APPROXIMATIONS
650	1	4	_aMATHEMATICAL MODELS
650	1	4	_aMICROCOMPUTERS
650	1	4	_aPARTIAL DIFFERENTIAL EQUATIONS
650	1	4	_aRESPONSE TIME (COMPUTER SYSTEMS)
650	1	4	_aSPURIOUS SIGNAL NOISE
650	1	4	_aSURFACE PROPERTIES
700	1	2	_aLoke, M.H.
700	1	2	_aBarker, R.D.
856	4	0	_uhttps://drive.google.com/file/d/1Kq5OWDoLK0l9DNCrnl0Gq3jR5hTKtL4w/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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