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Seismicity and seismotectonic deformations of the crust in the Southern Baikal basin

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Abstract

This paper addresses the seismicity of the Southern Baikal basin, where the M w = 6.0 earthquake of 1999 was the strongest over the period of instrumental observations in this region. Focal mechanisms of background earthquakes and aftershocks are analyzed in relation to faults mapped on flanks of and within the basin. Based on a supplemented catalog of focal mechanisms, the value and direction of seismotectonic strain are evaluated. The results show that the territory to the west of the transverse Angara fault (the Mishikhinskaya depression) experiences deformation of pure extension, while the E-W basin segment west of the fault is subjected to deformation of extension with shear (the transtension regime). The crustal deformation directions as determined from GPS measurements and seismological observations are found to agree well. The average seismotectonic strain rate of the crust amounts to 2.95 × 10−9 yr−1, which is about an order of magnitude smaller than the value obtained from geodetic observations.

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Authors and Affiliations

  1. Institute of the Earth’s Crust (IEC), Siberian Division (SD), Russian Academy of Sciences (RAS), ul. Lermontova 128, Irkutsk, 664033, Russia

    N. A. Radziminovitch, V. I. Melnikova, V. A. San’kov & K. G. Levi

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  1. N. A. Radziminovitch
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  2. V. I. Melnikova
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  3. V. A. San’kov
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  4. K. G. Levi
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Original Russian Text © N.A. Radziminovitch, V.I. Melnikova, V.A. San’kov, K.G. Levi, 2006, published in Fizika Zemli, 2006, No. 11, pp. 44–62.

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Radziminovitch, N.A., Melnikova, V.I., San’kov, V.A. et al. Seismicity and seismotectonic deformations of the crust in the Southern Baikal basin. Izv., Phys. Solid Earth 42, 904–920 (2006). https://doi.org/10.1134/S1069351306110048

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