Includes bibliographical references (pages 489-552) and index.

METHODS IN WAVEFORM AND SPECTRA STUDIES: Analysis of seismograms and other geophysical records -- Analysis in pre-computer time -- Waveform analysis and synthesis -- Frequency and spectral analysis -- Spectra versus time-domain analysis -- Non-analytical (analogue) methods for spectral determination -- Electromagnetic versus mechanical spectra -- FOURIER SERIES AND FOURIER TRANSFORMS: Fourier series -- Fourier integral and Fourier transform -- Basic theorems for the Fourier transform -- Calculation of Fourier transforms of analytic functions -- Multi-dimensional Fourier series and transforms -- POWER SPECTRA AND FUNDAMENTALS OF OBSERVATIONAL SPECTRA: Correlation functions -- Convolution -- Power spectra -- Analytical example of correlations and power spectra -- Spectra of observational data-fundamental problems -- Alternatives and extensions of spectral methods -- COMPUTATION OF SPECTRA OF OBSERVATIONAL DATA: Digital and analogue data -- Errors of digitization -- Effects of digitization-aliasing -- Window functions -- Discrete formulas -- Methods for spectral calculation -- RELIABILITY AND PRESENTATION OF SPECTRA: Reliability of harmonic analysis and spectral estimation -- Spectral parameters-theoretical approach -- Spectral parameters-empirical approach -- Spectral coordinates -- PRINCIPLES AND GEOPHYSICAL APPLICATION OF FILTERING: Principles of filtering -- Classification of filtering processes -- Examples of filtering operations -- Two-dimensional filtering -- Filtering and equalization in geophysics -- General comments on geophysical spectroscopy -- SPECTRAL STUDIES OF THE EARTH'S STRUCTURE: Local-scale properties-body waves -- Regional-scale properties-surface waves -- Global-scale properties-free oscillations -- Seismic wave attenuation -- SPECTRAL STUDIES OF SEISMIC SOURCE PROPERTIES: Earthquake mechanism -- Explosion-earthquake discrimination -- Magnitude -- Focal depth -- Earthquake periodicity -- SPECTRAL STUDIES IN METEOROLOGY, OCEANOGRAPHY AND MICROSEISMOLOGY: Meteorology -- Oceanography -- Microseismology -- SPECTRAL STUDIES OF GRAVITY AND GEOMAGNETISM: Time series analyses -- Space series analyses -- Combined studies.