Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1966. Ph.D. / Lacking l. 95-114. Vita. / Bibliography: leaves 86-88. / Ph.D.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1967. / Bibliography: leaves 50-51. / by John Barton DeWolf. / M.S.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1967. / Vita. / Bibliography: leaves 156-164. / Ph.D.

Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968. / Bibliography: leaf 13. / B.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968. / Bibliography: leaves 49-50. / by John Bailey Adger, Jr. / M.S.

Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology and Geophysics, 1955. / Vita. / Bibliography: leaves [78-80]. / by Robert Bowman. / Ph.D.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961. / Includes bibliographical references (leaves 44-45). / by George Francis Beardsley, Jr. / M.S.

Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. Ph.D. / Ph.D.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1962. / "June 1962." / Includes bibliographical references (leaf 73). / The response to a harmonic point source in a liquid layer overlying a liquid half space is computed as a function of frequency. Included are the contributions form all normal modes that occur, and the branch-line integral representing the refraction arrival. The value of the refraction arrival is given in terms of the complex error function. The effect of different velocity and density contrasts are considered, and the effect of source depth and the distance to the receiver are investigated. The results giving the behavior of the magnitude of the branch line show that it is much larger at the mode cutoffs than at other values of frequency. The total amplitude of the response shows a regular oscillation in the frequency range in which two modes are present, and somewhat irregular high and low values over the range in which three modes are present. This behavior reflects the difference in amplitude at frequencies for which modes reinforce or interfere with each other. / by Roy J. Greenfield. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963. / "February 1963." / Includes bibliographical references (leaf 89). / The first part of this thesis is concerned with the mathematics of filtering in discrete time. Filters are defined for the purposes of 1) condensing waveforms into impulsive functions 2) wave shaping 3) noise suppression 4) signal detection according to the criterion of maximum signal-to-noise output at an instant and 5) the same over an interval. The behavior of the complex Fourier transforms of some of these filters is considered and connection is made with the theory of orthogonal polynomials. This leads to the possibility of a feed back representation of these filters. In the second part, computational experiments are described in which digital filters are applied to seismic body waves to i) try to determine whether the first arrival is up or down on a seismogram corrupted with microseismic noise, 2) increase signal-to-noise ratio on seismograms where noise has almost obliterated signal 3) assign polarity to each of two seismic first motion wavelets so they can be termed "same" or "opposite," 4) remove spectrum of seismometer from data, 5) investigate the time varying spectral structure of underground nuclear shot seismograms. / by Jon F. Claerbout. / M.S.