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GEOMETRICS .

CONTENTS:

PREFACE

INTRODUCTION

MAGNETOMETERS

Instrument use

Proton magnetometer

Total field measurement

Limitations of a proton magnetometer

EARTH FIELD MAGNETISM

Introduction

Time variations

Magnetic minerals and iron

Induced magnetization

Remanent and permanent magnetization

FIELD PROCEDURES AND DATA REDUCTION

Magnetic cleanliness and sensor positions

Operational considerations

Valid reading vs. noise

Sensor orientation

Instruments readings

Correction for time variations

High magnetic gradients

Contour maps

Construction of a contour map

INTERPRETATION

Introduction

Asymetry

Depth dependence

Other anomaly shape factors

Geological models

Elementary dipoles and monopoles

Simplified method for total field signature

Earth's field component behavior

Dipoles vs. monopoles

Vs. array of poles

Configuration of field lines

Dipole and monopole fall-off factor

Dipole factor-of-two

Application of method

Contour presentation of dipole and prism anomalies

Anomaly amplitude

Amplitude estimates for common sources

Dipole and monopole signatures in vertical and horizontal fields

Maximum amplitude given magnetization and generalized form

Anomaly depth characteristics

Anomaly width

Anomaly depth estimation

Identification of anomaly

Fall-off rate

Assumption of maximum amplitude and depth estimates

Half width rules

Slope techniques

Other depth estimating methods

Interpretation summary

MAGNETIC SUSCEPTIBILITY, MAGNETIZATION AND MAGNETIC MOMENT MEASUREMENTS

Introduction

Applications

Procedures

Random sample rotation for magnitude only

Systematic rotation for magnitude and direction

Dipole in erth's field

Non-spherical object rotation

MAGNETIC SEARCH

Introduction

Determination of object magnetism

Detectibility

Magnetic anomaly signatures

Depth/Amplitude behavior

SEARCH PROCEDURES

Determination of magnetic moment vs. search grid vs. resolution

Traverses

Detailed mapping for pinpointing Location

SPECIAL SEARCH TOPICS

Iron and steel

Permanent vs. induced anomaly sources

Pipelines (horizontal)

Magnetic markers

ARCHAEOLOGICAL EXPLORATION

Introduction

Magnetic anomalies of archaeological origin

Remanent magnetization

Archaeomagnetism

Magnetization and susceptibility of soils

Remanent magnetization of soils

Magnetic anomaly complexity

Archaeological survey planning and feasibility

Archaeological anomaly amplitude and signatures

GRADIOMETERS NAD GRADIENT TECHNIQUES

Introduction

Applications of thegradiometer

Conditions for gradient measurement

Gradiometer sensitivity

Gradiometer readings in the field

Gradiometer as a filter

Calculation of vertical gradient

General expression involving gradients and coordinates

Gradient vector diagrams and vector information from total field

MAGNETIC MEASUREMENTS OF ELECTRIC CURRENT DISTRIBUTIONS

Introduction

Applications

Configuration of magnetic field of electric current sources

REFERENCES

 
 
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