Издатель: Elsevier Science , Место издания: Amsterdam , Год издания: 2010

We present the results of a long-term experiment involving vibroseismic monitoring of the Earth's crust, which began in 1997 in the Thom'-Kolyvan' fold zone. Two vibrators of 100- and 40-ton force were used as excitation sources. One three-component (3C) sensor was placed 3 m under the source platform, while another 3C sensor was located at the Novosibirsk Seismological Station, 49 km from the vibrators. Data were collected periodically during several years. The seasonal variations in the frequency characteristic of the vibrator radiation have been investigated. Freezing and thawing of the ground was found to have an effect on vibrator radiation, such that there are distinct winter and summer radiation patterns generated by the vibrator (as well as transition periods in between). The seismograms from the remote zone also reveal cyclical changes in winter and summer. Travel-time wave attributes do not vary with freezing or thawing of the ground, while the dynamic behavior of recorded traces has a pronounced correspondence with freezing or thawing for different years. More detailed research has found that the freezing and thawing of the ground affect not only the radiation spectrum, but also the directional diagram of the source.