Geophysical Abstracts 152 January-March 1953

SEISMOLOGY 29
Silesia are presented, and compared with geologic evidence. Further develop­
ment of such investigations and their practical value is advocated. S. T. F.
14270. Teichmiiller, Rolf, and WolflE, Wilhelm. Der geophysikalische Nachweis
von Kohlenfl'b'zen in Tiefbohrungen [Geophysical identification of coal
seams in deep drill holes] : Gliickauf, Jahrg. 89, heft 3/4, p. 78-82,1953.
By use of Schlumberger well-logging techniques applied to exploration for coal,
seams of only 10 cm thickness can be detected; electrical methods can be supple­
mented to great advantage by gamma-ray measurements, because the coal layers
do not contain radioactive substances, and the surrounding formations usually
contain K40. 8. T. V.
14271. Wyllie, M. R. J., and Morgan, Frank. Comparison of electric log and
core analysis data for Gulf's Frank no. 1, Velma pool, Stephens County,
Okla.: Producers Monthly, v. 16, no. 12, p. 31-43, 1952.
See Geophys. Abs. 13972. M. C. R.
SEISMOLOGY
ELASTIC WAVES
14272. Dungen, F. H. Van den. Formules pour 1'integration numerique de
1'equation des ondes [Formulas for the numerical integration of the
wave equation]: Acad. royale Belgique Bull., Cl. sci., 5 e ser., tome 38,
p. 669-684,1952.
Approximate formulas for the numerical integration of the wave equation for
2- and 3-dimensional cases are derived and their application discussed. 8. T. V.
14273. Haskelli N. A. The dispersion of surface waves on multilayered media:
Seismol. Soc. America Bull., v. 43, no. 1, p. 17-34,1958.
A matrix formalism developed by W. T. Thomson is used to obtain the phase
velocity dispersion equations for elastic surface waves of Rayleigh and Love
type on multilayered solid media. The method is used to compute phase and
group velocities of Rayleigh waves for two assumed three-layer models and one
two-layer model of the earth's crust in the continents. The computed group
velocity curves are compared with published values of the group velocities at
various frequencies of Rayleigh waves over continental paths. The scatter
of the observed values is larger than the difference between the three computed
curves. It is believed that not all of this scatter is due to observational errors,
but probably represents a real horizontal heterogeneity of the continental crusts.
Author's Abstract
14274. Kosminskaya, I. P. Amplitudnyye krivyye i godografy faz seysmicheskikh
voln, vyzvannykh tochechnym istochnikom rasshireniya v odnorodnom
ideal' no uprugom bezgranichnom prostranstve [Amplitude curves and
travel times of seismic waves, produced by a distending point-source in
a homogeneous perfectly elastic infinite space]: Akad. Nauk SSSR Izv.,
Ser. geofiz. no. 6, p. 39-47,1952.
On the assumption of a perfectly elastic infinite medium, amplitudes and travel
times are computed for seismic waves produced by a point source which is the
center of harmonic extensions and compressions with amplitudes Ao. Such a
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