In those years, after the catastrophic Ashgabat earthquake, one of the important economic problems was the problem of earthquake forecasting, then seismic zoning of the country was especially important, the Institute of Earth Physics became the leading organization in this direction. Thanks to the erudition of Petrushevsky, his extensive experience in geological research and the ability to quickly navigate new issues, he soon became the head of the seismic zoning sector. From then until the end of his life, the scientific activity of B. A. Petrushevsky was connected with the problem of geological criteria for seismic zoning.
He was an ardent advocate of a historical and structural approach to identifying zones of possible earthquakes of varying strength. I must say, then there were two methods for assessing the potential seismicity of a particular region. One of them - seismic statistics - was based on the summation of data on past earthquakes. The assessment of the geological situation is the most superficial. Another method, called seismotectonic, claimed that the degree of seismicity of the area can be established by studying tectonic faults that occur on the surface.
In his first works, Petrushevsky showed that both methods are insufficient. Attaching importance to seismic statistics, he also believed that the geological foundations of seismic zoning should be significantly expanded, they should include the study of not only tectonic faults, but also the entire long geological history, especially the latest. Indeed, the material composition of the earth's crust, which determines its mechanical properties, and the modern features of its development, such as, for example, division into blocks and so on, depend on global processes of the past. B. A. Petrushevsky set forth these ideas in expanded form in 1955 in his monograph “The Importance of Geological Phenomena in Seismic Zoning”. The monograph has still fully retained its methodological significance.
In the 50s, a group of geologists from the Institute of Physics of the Academy of Sciences of the USSR headed by Petrushevsky conducted regional studies in all the main seismic areas of the Soviet Union: in the Caucasus and Central Asia, in Kazakhstan and Altai, in the Sayans and Verkhoyansk, Kamchatka and the Kuril Islands. Everywhere we studied the history of vertical movements of the earth's crust over a possibly longer period of time, the history of sedimentation, folding, and magmatic processes.
Based on all these data, in 1956 a new map of seismic zoning was compiled for the entire territory of the Soviet Union. For this work B. A. Petrushevsky (together with S. V. Medvedev and E. F. Savarensky) was awarded the prize of the Presidium of the USSR Academy of Sciences.
Boris Abramovich visited all those areas where his employees worked. He devoted most of his time to Turkmenistan (the project of the Great Turkmen Canal was being developed there at that time), Central Asia and the Far East. One after another his articles appeared: about the tectonics of Kopetdag, about the nature of the Greater Balkhan, about the seismogeology of Western Turkmenistan, about the nature of the Asian mountain belt, about the tectonics of the Pamirs. Research conducted in the Far East led to the creation of a large (300 pages) monograph, “Issues of the Geological History and Tectonics of East Asia.” In this book, published in 1964, Petrushevsky poses the most general questions of the geological development of East Asia and its relationship with the Pacific Ocean. The main conclusion was that up to modern times, East Asia developed according to the general laws of the development of continents and only very recently has the Pacific advancing on the continent began to influence it. Welcome to the 18 free video chat Looking for Live Chat porn movies, Free sex cam videos with real amateur webcam girls from
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