Journal of the International Association for Mathematical Geology
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Estimation of semivariogram parameters and evaluation of the effects of data sparsity
Journal of the International Association for Mathematical Geology - Tập 27 - Trang 327-358 - 1995
Semivariogram parameters are estimated by a weighted least-squares method and a jackknife kriging method. The weighted least-squares method is investigated by differing the lag increment and maximum lag used in the fit. The jackknife kriging method minimizes the variance of the jackknifing error as a function of semivariogram parameters. The effects of data sparsity and the presence of a trend ar...... hiện toàn bộ
Cyclic characteristics of sediments in the Moon Island Beach Subgroup, Newcastle Coal Measures, New South Wales
Journal of the International Association for Mathematical Geology - Tập 5 - Trang 91-110 - 1973
Cyclic characteristics of a sequence of Permian coal-measure sediments have been studied using Markov chain analysis on borehole data. Fining-upwards and oscillating sequences can be distinguished, and depositional regimes are proposed to explain the observed sequences. However, there is no clearly defined relationship of sequence type to tectonosedimentary environment. The relationship of the nu...... hiện toàn bộ
Fitting straight lines when both variables are subject to error.
Journal of the International Association for Mathematical Geology - Tập 11 - Trang 1-25 - 1979
Usual methods for fitting a straight line, Y =α + βX,to data fail if the “independent” variable Xis subject to error. The problem is further complicated if there is no strong reason for selecting one of the two variables as independent; neither of the two lines may be correct. This review article discusses the maximum likelihood estimators of α and β under functional and structural models. These ...... hiện toàn bộ
Another view of the use of factor analysis in geology
Journal of the International Association for Mathematical Geology - Tập 11 - Trang 717-720 - 1979
An Initial Guess for the Levenberg–Marquardt Algorithm for Conditioning a Stochastic Channel to Pressure Data
Journal of the International Association for Mathematical Geology - Tập 35 - Trang 67-88 - 2003
A standard procedure for conditioning a stochastic channel to well-test pressure data requires the minimization of an objective function. The Levenberg–Marquardt algorithm is a natural choice for minimization, but may suffer from slow convergence or converge to a local minimum which gives an unacceptable match of observed pressure data if a poor initial guess is used. In this work, we present a pr...... hiện toàn bộ
Association announcement
Journal of the International Association for Mathematical Geology - Tập 27 - Trang 555-558 - 1995
Models of residual kerogen kinetic evolution: A reply to Nielsen and Burnham
Journal of the International Association for Mathematical Geology - Tập 25 - Trang 91-97 - 1993
A stochastic model for strike-slip faulting
Journal of the International Association for Mathematical Geology - Tập 12 - Trang 399-412 - 1980
The frequency of length of strike-slip faults in continental crust follows a lognormal probability distribution, and a nonlinear positive correlation exists between length and offset. These results appear to be scale-independent. An explanation of the observations is presented in terms of a stochastic model which treats the occurrence of faulting as a Kolmogorov-type process obeying the law of pro...... hiện toàn bộ
Multifractal modeling and spatial statistics
Journal of the International Association for Mathematical Geology - Tập 28 - Trang 1-16 - 1996
In general, the multifractal model provides more information about measurements on spatial objects than a fractal model. It also results in mathematical equations for the covariance function and semivariogram in spatial statistics which are determined primarily by the second-order mass exponent. However, these equations can be approximated by power-law relations which are comparable directly to e...... hiện toàn bộ
Book review
Journal of the International Association for Mathematical Geology - Tập 18 - Trang 583-585 - 1986
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