Showing papers in "Computers & Geosciences in 1984"

TL;DR: A FORTRAN-IV coding of the fuzzy c -means (FCM) clustering program is transmitted, which generates fuzzy partitions and prototypes for any set of numerical data.

TL;DR: In this article, the theoretical link between spline interpolation and kriging has been established and a theoretical comparison of splines interpolation with kriged with fixed covariance and degree of polynomial trend is made.

TL;DR: In this paper, a FORTRAN program is designed to recalculate electron microprobe analyses of amphiboles into amphibole structural formulae, based on stoichiometric constraints of amphibole crystal chemistry.

TL;DR: The program is used to compare three ranking algorithms provided by Agterberg and Nel as well as to determine whether the algorithms work as well for datasets combining lads and fads vs datasets for lads- only or fads-only.

TL;DR: In this paper, a series of 6 FORTRAN programs for the classification of synoptic weather maps from gridded atmospheric pressure surface data is presented, and an example illustrating the applicaton of the procedure is discussed.

TL;DR: The subroutine STRECH stretches a time series without disturbing the data structure perceptibly, as shown by analytical results from both auto- and cross-time series analysis of simulated and factual data.

TL;DR: In this article, a FORTRAN IV computer program for seismic hazard analysis is presented and illustrated by an example, which evaluates the parameters of Gumbel's first and third type asymptotic distributions of extreme values and in the latter situation it is based on the nonlinear least squares method developed by Marquardt.

TL;DR: Although the program is concerned specifically with description of lithofacies within clastic sedimentary sequences, the use of external files to describe the coded variable descriptors and their textual translations, makes this a versatile program, which can be adapted readily for other purposes.

TL;DR: FUSE is a program written in FORTRAN 77 for the agglomerative fusion or cluster analysis of 500 or more individuals on minicomputers using the use of direct-access I/O and a sorted queue to enable reasonable execution times.

TL;DR: In this paper, the problem of constructing a discrete time scale from a graph-theoretic point of view is approached from a biochronological perspective, where a set of species pairs can be identified in a large geographical area.

TL;DR: A FORTRAN IV computer program is documented which implements the nonlinear alternating direction implicit (ADI) method of Gustafsson (1971) for a limited area finite-difference integration of a shallow-water equations model on a β-plane and, due to the enforcement of conservation of integral-invariants via the augmented Lagrangian method, no finite-time “blowing” was experienced.

TL;DR: In this article, a database on Middle Jurassic-Early Cretaceous radiolarians consisting of first and final occurrences of 110 species in 226 samples from 43 localities was used to compute Unitary Associations and Probabilistic Ranking and Scaling (RASC) in order to test deterministic versus probabilistic quantitative biostratigraphic methods.

TL;DR: A low-power microprocessor-based seismic signal detection system has been developed for monitoring and recording earthquakes detected from multichannel seismic network data and is suitable for large or small aperture networks because 20 sec of data for each channel are stored in memory.

TL;DR: In this paper, a formalized use of the relation "later" is suggested for stratigraphic correlation by means of ordinal scales, where the latter maximizes the relative range of a taxon in time whereas the former estimates the average range.

TL;DR: A computer program is described for the acquisition of geographical coordinates from maps in widely used cylindric and conic conformal projections: Direct Mercator, Lambert conformal, UTM, and Polar Stereographic that uses the geometrical affine transformation of homogeneous coordinates and the direct and inverse analytical mapping functions of conformal projection.

TL;DR: KALTZ is a program which simulates experimental procedures using such a furnace to study the system kalsilite-silica and file and graph printouts provide for the convenient construction of the phase diagram for this system.

TL;DR: An interactive FORTRAN IV program is presented which calculates unique area-of-influence polygons around points distributed in any pattern in a defined field to approximate regular field boundaries to any desired degree of accuracy.

TL;DR: A FORTRAN IV program is presented, in which adjusted values of the gravity bases are calculated with their standard deviations and standard errors followed by a histogram display of residuals.

TL;DR: In this paper, the three primary biostratigraphic attributes of fossils comprise, geographical range, facies distribution, and vertical range, which can be quantified in several manners.

TL;DR: A FORTRAN IV computer program is documented implementing a compact fourth-order accurate finite difference scheme in a spatially factored form, for solving the nonlinear shallow-water equations on a limited domain.

TL;DR: The computing algorithm is executable on a minicomputer like PDP 11/40 and as such is useful to many geoscientists who do not have access to mainframe computer, for computing model data to fit and interpret field observations from electromagnetic depth sounding experiments.