THIRD-ORDER NONLINEAR SEISMIC EFFECTS

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dc.contributor.author Groshkov A.L.
dc.contributor.author Kalimulin R.R.
dc.contributor.author Shalamov G.M.
dc.date.accessioned 2020-10-08T10:25:13Z
dc.date.available 2020-10-08T10:25:13Z
dc.date.issued 1989
dc.identifier https://elibrary.ru/item.asp?id=31092323
dc.identifier.citation Transactions (Doklady) of the USSR Academy of Sciences. Earth Science Sections, 1989, , 5, 3-5
dc.identifier.issn 0891-5571
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/17768
dc.description.abstract The existing experimental studies of nonlinear seismic waves have concentrated on second-order effects. The thereby-detected anomalously large values of the second-order nonlinearity parameters of geophysical media resulting from their structure suggest that there should be similarly large third-order nonlinearity constants. We made an experimental study of cross-modulation of a longitudinal acoustic wave with frequency f1 = 3 kHz by the seismic field of a vibrator operating at f2 = 50 Hz. It has been demonstrated experimentally that soil has an anomalously high third-order nonlinearity. The measured changes in the wave propagation velocities are rather high, and calculations indicate that other third-order effects may also occur, including steady-state focusing, nonsteady-state pulse-spectrum broadening and the like. The measured values of N and B indicate that the cubic terms in the equations of motion presented in our earlier papers are comparable in magnitude with the quadratic terms at ε0 ≅ 4 · 10-5. As a result, the approximate 5- or 9-constant equations of elasticity cannot be used in the near zone of the vibration sources: exact models must be employed.
dc.title THIRD-ORDER NONLINEAR SEISMIC EFFECTS
dc.type Статья


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