The January 6, 2006, Balei earthquake as a reflection of the present tectonic activity of the east Trans-Baikal Region |
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Authors: | Mel’nikova V I Radziminovich Ya B Gileva N A Radziminovich N A Papkova A A |
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Institution: | 1.Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia ;2.Baikal Division of the Geophysical Service, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia ; |
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Abstract: | The results of detailed studies of the January 6, 2006, Balei earthquake (K
p = 13.1, M
b = 4.7 7]), which occurred in an almost aseismic area of the east Trans-Baikal Region, are presented. The focal mechanism
and dynamical characteristics of the focus are considered, and the structural-tectonic position of the focus is analyzed.
It is supposed that the focus of this seismic event coincides with an activated segment of the northwest-striking Balei-Darasun
fault. The maximal observed macroseismic intensity was 5–6 points by the MSK-64 scale (in the town of Baleis). The origination
of foci for the earthquake with such intensity and magnitude takes place substantially owing to subhorizontal northeastern
compression, the varied-rank block structure of the medium, and low rate values of tectonic motions; on aggregate, all these
factors promote the accumulation of stresses in the Earth’s crust. The obtained data can be useful for the purpose of assessment
in seismic danger of the region. |
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