The upper layer of the earth’s crust may be investigated using high-rise buildings’ vibrations under the wind pressure. This simple and economical method of seismic survey was developed by the specialists of the Arkhangelsk Institute of Ecological Problems of the North (Ural Branch of the Russian Academy of Sciences) and the Schmidt Institute of Physics of the Earth (Russian Academy of Sciences) under the guidance of F. N. Yudakhin, Corresponding Member of the Russian Academy of Sciences. The method was born from revision of the active snap location in the earth’s crust in the Arkhangelsk Region, at the Northern Dvina mouth.
Winds are rather strong in the surface atmospheric layers. Internal whirlwinds occur, creating wind surges. Wind impulses cause vibrations to the objects protruding from the relief for 10 meters and more, these vibrations, for their part, being transmitted to the earth’s crust. A Russian scientist B.B. Golitsyn considered possibilities of this effect back at the beginning of the last century. However, field observation did not provide distinct results at that time due to equipment imperfection. Contemporary experiment equipment, including digital recording and methods of weak signal extraction allow to solve such tasks and to use results for deep sounding of the earth’s crust.
Protruding elements of the relief may be both natural (mountain peaks, rock pillars) and artificial ones (towers, hoisting cranes, high-rise buildings). Their vibrations under the wind are described in a well-known task about vibrations of a rod with fixed end. In reality, the object is never rigidly fixed and it transmits vibrations via its foundation to geological environment. Thus, shuddering under blasts, any sky-scraper or hoisting crane turn into a peculiar seismic source emitting its own signals. Such sources are much more convenient than vibrating oscillators, which are commonly used for the earth’s crust survey.
Sergey Komarov | alfa
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