TSAGAN-SHIBETU EARTHQUAKE 29.07.2022 WITH ML=6.2 AND THE POSITION OF THE FOCAL AREA IN THE WESTERN MOUNTAIN FRAME OF THE TUVA BASIN
A.F. Emanov1, A.A. Emanov1,2, E.V. Shevkunova1, E.A. Gladyshev1
1Altai-Sayan Branch of the Geophysical Survey, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Eastern Altai, Tsagan-Shibetu ridge, Tsagan-Shibetu earthquake, aftershocks and foreshocks
Abstract
The Tsagan-Shibetu earthquake 29.07.2022 with ML = 6.2, MW=5.5, time UTC 13:01:10,1 occurred in the ridge of the same name in the east of the Gornyi Altai near the Tuva Basin (50.51º N, 90.69º E). In the twentieth century, this ridge was seismically inactive and neighbored seismically active ones: the focal area of the Ureg-Nur earthquake of 1970 with MS=7.0 and the seismically active Shapshalsky ridge, where earthquakes with a magnitude of up to five often occurred, and there were no large earthquakes yet. After the Chuya earthquake of 2003 with MS=7.3, significant changes occurred in the seismicity structure of Altai, after a lull, new zones of increased activity emerged, one of which is the Tsagan-Shibetu ridge. In the internal structure of the ridge, a focal area with a triple areal structure and with an impulse development of the process over time was formed. The formation of high ridge activity occurred in the presence of foreshocks.
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