Schmucker, 1970 (Scripps) - MTNet

CONTENTS
Abstract . . . . . . . . . . . . • . . . . . ix
Notation. • • • • x
1. Introduction.. . . • • • • • • • • • • • 1
1.1 Induction anomalies of geomagnetic variations. 1
1.2 Basic equations ••••.•.••.•••..•• 2
1.3 Conductivity distribution in the earth's crust and mantle 5
1.4 The conductivity-temperature relation in the upper mantle 7
2. Instruments and Field Operations •••.
2.1 Askania variograph ••••••.••
2.2 Intercalibration of the variographs
2.3 Temperature coefficients of the variometers.
2.4 Time signals and synchronization of records.
2. 5 Field stations . . . . • • • • •
2.6 Base-line' control •..••
2.7 Causes for loss of records
3. Data Reduction. • . • • • • . • • • 13
3.1 Basic concepts . . . • • • . • 13
3.2 Selection of time intervals for analysis. • 14
3.3 Scaling and scaling errors ••••.•••• 14
3.4 Separation of anomalous and normal parts 15
3.5 Powerandcrossspectra ••••. 16
3. 6 Spectral analysis of single events. . • • • • 17
3. 7 Spect;ra of storms . • . . . • • • • . . • • • 19
3.8 Correlation analysis between anomalous and normal parts
(transfer functions). . . . . . • 20
3.9 Residuals....................
3.10 Induction and perturbation arrows •....••
3.11 Special case I: Unrelated normal Z-variations
3. 12 Special case II: Elongated anomalies .•.
3. 13 Special case III: Pilot study •••. . • . .
3. 14 Contribution of scaling errors to residuals
3.15 Examples for correlated Z-variations ..•
3.16 Separation of internal and external parts
3. 17 AnalysiS of diurnal variations and pulsations
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