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Abstract |
Influencing of Effects of Sounding
Nonlinearity on Characteristics of a Wave Field of the Power Vibrator
M.S.Khairetdinov, R.V.Rodugin
(Institute of Computational Mathematics and Mathematical Geophysics, SB RAS,
Novosibirsk, Russia)
e-mail:
marat@opg.sscc.ru
Analysis
of effects of physical nonlinearity in the field of a seismic sourņes and their
influencing on an painting of spatially - temporal structure wave fields in a
long-range zone introduce major problem for modern seismology. Major
perspectives for investigation here introduces a vibroseismic method of
sounding of the Earth with the help of regular seismic oscillations, generated
with the help of power vibrational sources. Such sources are mounted on a
daylight area of the Earth and raise in medium monochromatic oscillations or
oscillations of increasing frequency in a given band.. In case of failure of a
requirement of a continuity of the vibrator from underlying medium he passes in
free flying, that is a reason of origin of nonlinear effects calling occurrence
of harmonics in amplitude of ground motion. In view of this effect in the
report the relations of characteristics of vibrator wave fields in the nearest
and long-range zones on the basic and multiple frequencies in conditions of
sounding of signals with a linear frequency modulation and monochromatic
signals are analyzed.
Section
: 6