Call number:
ZSP-201-77/20
In:
CRREL Report, 77-20
Type of Medium:
Series available for loan
Pages:
ix, 48 S. : graph. Darst.
Series Statement:
CRREL Report 77-20
URL:
https://apps.dtic.mil/docs/citations/ADA044684
Note:
CONTENTS
Abstract
Preface
Summary
Symbols
Introduction
Background
Objectives
Experimental procedures
Principles of electromagnetic resistivity surveying
Resistivity of earth materials
Radiowave propagation within the earth-ionosphere waveguide
Radiowave interaction with the earth
Instrumentation
Airborne
Ground
Methods
Experimental procedures
Test site
Survey traverses
Results
Study no. 1 — standard survey
Study no. 2 — topographic and resistive effects upon £ xq and £ z j
Study no. 3 — general effects of altitude upon geologic resolution
Study no. 4 — ground level study of phase and amplitude effects
The standard survey reevaluated
Conclusions and final remarks .
Literature cited
Appendix: Glossary of geologic terms used
ILLUSTRATIONS
Figure
Electromagnetic field vectors of a radiowave propagating over the earth’s su rface
Resistivity ranges of most earth materials
Two radiowave propagation modes in the earth-ionosphere waveguide
Coverage for well-known LF stations
Simply layered flat earth model used for deriving the definitions of apparent
resistivity and also used in modern data interpretation techniques
Skin depth of radiowaves as a function of frequency for various values of resistivity
Branch Library:
AWI Library
