EDB

User's manual for the finite element program TURAM is described. With the program we can calculate theoretical anomaly curves for real geological two- dimensional structures in the field of a line source (Turam cable). The program is user oriented and it generates the finite element grid auto- matically. It is based on a program for two-dimensional calculation of elec- tromagnetic fields in power engineering applications, and is written in Fortran IV for the computer Univac 1108 of the Norwegian Institute of Technology.

User's manual for the finite element program PLANE WAVE is described. With the program we can calculate theoretical anomaly curves for real geological two- dimensional structures in the field of a plane wave. The program contains three plane wave cases: TE and TM mode magnetotellurics and VLF. The program is user oriented and it generates the finite element grid auto- matically. It is based on a program for two-dimensional calculation of elec- tromagnetic fields in power engineering applications, and is written in Fortran IV for the computer Univac 1100/62 of the Norwegian Institute of Technology.

Kort beskrivelse av databasen PROARK. Den er enkel i bruk og gir god oversikt. Basen bygger på IMAGE og QUERY og tenkes bruk til registrering av nøkkeldata for prosjekter, rapporter og analyseoppdrag ved NGU Kjemisk avdeling. Med små forandringer kan systemet brukes for hele NGU.

A program for layered model(one-dinmensional) interpretation of audiomagneto- telluric (AMT) measuremants is described. The program is based on least - squares fit and on hyperparabolic optimization. The essential feature of the optimization method is that up to four parameters can be optimized simul- taneously. The program uses nine fixed frequencies from 3700 to 8 Hz, but it can easily be changed for any other frequencies. The program is written in Fortran IV for the computer Hewlett-Packard 3000 of the Geological Survey of Norway.

A finite element program for two-dimensional modeling of Turam is described. The program is user oriented and has automatic grid generation. The output includes printout and plots of normalized flux dendities along a surface profile or in a bore hole. It is possible to choose between a plot of the total magnetic field or of the normalized magnetic field, i.e. of the ano- malous field. The program has been used to simulate three-dimensional models. This has been achieved by specification of the total current through the conductor in relation to the total current through the half space. By reducing the amount of current in the conductor, a reduction of the length of the conductor is simulated. Examples which demonstrate the effect on the anomaly curves are given. By reducing the gathered current (also called conductive current), the electromagnetically induced edge current will dominate the anomaly curves. A case history is also given.

Et edb-program, GRID30, omregner data fra spredte punkt til data i rutenett (grid). Datamaterialet er dødelighetsrater fra 442 enkeltkommuner i Norge. Programmet lager to kart, ett rådatakart og ett løpende gjennomsnitt. Interpoleringsradiusen er varierende og avhenger av folketallet (minimum 20 000)innenfor sirkelen. Dødelighetsdata for enkeltkommunene blir veid med hensyn på folketall og avstand fra midtpunktet i gridcellene. Celler med færre enn 100 innbyggere blir ikke skravert. Et GEOPAK-program utfører den grafiske bearbeidingen av de utregnede data og ferdig kart i svart/hvitt tegnes på Appliconplotter. Kartene viser utbredelse av fem former for kreft og hjerte-karsykdommer, medfødte misdannelser, perinatal dødelighet, pernisiøs anemi og multippel sklerose.

Det er gitt en oversikt over hvilke datasett som er benyttet i prosjektet. Det er skissert planer for framtidige arbeidsområder, som omfatter bearbeiding av data for geofysikk, berggrunnsgeologi, kvartærgeologi, bekke- sedimentgeo-kjemi, landskogstakseringsdata og humusgeokjemi.

Rapporten vurderer samarbeid med IKU om bruk av datamaskiner, organisering av seksjonen og tilgrensede aktiviteter, krav til lokaler for seksjonen og alternative lokaler for seksjonen.

A program for the Hewlett Packard-41 CV pocket calculator for calculating audiomagnetotelluric (AMT) apparent resictitivity curves for layered model is described. The program calculates the apparent resistivity at 10 predesti- nated frequencies ranging from 10 000 to 8 Hz.

User's manual for the finite element program TURAM is described. With the program we can calculate theoretical anomaly curves over real geological two- dimensional structures in the field of a line source of current for either the conventional Turam or the so-called Elfast version. The program is user oriented an uses automatic grid generation. It is based on a program for two dimensional calculation of electromagnetic fields in power engineering applications, and is written in Fortran IV for the computer Univac 1100/62 of the Norwegian Institute of Technology. This report replaces the earlier user's manual for the TURAM program (Report No. 1765/1).