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The 2008 Kultuk earthquake with M w = 6.3 in the south of Baikal: Spatial-temporal analysis of seismic activation

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Abstract

The results of investigating the data of stationary and field observations in the epicentral zone of the Kultuk earthquake of August 27, 2008 with M w = 6.3 localized south of Baikal are presented. The seismic activation amounting to 1790 aftershocks with K p ≥ 4 (M w ≥ 0.9) affected a part of the general fault bounding the southwestern coast of the lake and shallower intrabasin structures. It was established through the cluster analysis that the main shock was located at the periphery of the cloud of the concentrated seismicity component, and three main clusters reflecting a complex character of rupture in the earthquake source were identified in the zone of aftershocks. Owing to a high accuracy of aftershock hypocenters determinations (ERZ ≤ 1.2 km), the local character of the seismisity-generating zones was revealed. Based on the method of mapping seismic regime parameters, it was established that zones of reduced fractionality are recognizable in the central part of the source area; in this case, the entire periphery, except for the southeastern direction (where the main shock epicenter is located), is characterized by a high fractionality, which also points to the complex character of the rupture in the source. On the whole, the aftershock sequence under consideration showed the activation of the southwestern flank of the Southern Baikal region, which remained passive for more than one century, and demonstrated destructive features of the Earth’s crust.

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Authors and Affiliations

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

    V. I. Mel’nikova

  2. Baikal Branch of Geophysical Survey, Siberian Division, Russian Academy of Sciences, Irkutsk, Russia

    N. A. Gileva & O. K. Masal’skii

  3. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia

    S. S. Aref’ev & V. V. Bykova

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  1. V. I. Mel’nikova
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  2. N. A. Gileva
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  3. S. S. Aref’ev
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  4. V. V. Bykova
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  5. O. K. Masal’skii
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Original Russian Text © V.I. Mel’nikova, N.A. Gileva, S.S. Aref’ev, V.V. Bykova, O.K. Masal’skii, 2012, published in Fizika Zemli, 2012, Nos. 7–8, pp. 42–62.

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Mel’nikova, V.I., Gileva, N.A., Aref’ev, S.S. et al. The 2008 Kultuk earthquake with M w = 6.3 in the south of Baikal: Spatial-temporal analysis of seismic activation. Izv., Phys. Solid Earth 48, 594–614 (2012). https://doi.org/10.1134/S1069351312060031

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