Seismicity of the southern Siberian platform: Spatiotemporal characteristics and genesis |
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| Authors: | K Zh Seminskii Ya B Radziminovich |
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| Institution: | (1) Institute of the Earth’s Crust, Siberian Division (SD), Russian Academy of Sciences (RAS), ul. Lermontova 128, Irkutsk, 664033, Russia |
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| Abstract: | Analysis of instrumental data on earthquakes of 1960–2005 in the Irkutsk amphitheater shows that the majority of the earthquakes form a wide (150–300 km) band of diffuse seismicity along the marginal suture of the Siberian platform. In accordance with established regular spatiotemporal patterns of the distribution of earthquakes, this band belongs to the Sayan-Baikal seismic belt, associated with the destruction process at the boundary of large lithospheric blocks. The band is located on the northern periphery of the belt and, the deformable substrate being highly monolithic, this sharply weakens the seismicity within the band. Because of the tectonic origin of earthquakes in such a vast platform territory, undoubted evidence for induced seismicity around the Angara cascade reservoirs, and the intense economic development of the region, the problem of seismic hazard in the southern Siberian platform should be regarded as one of the most significant objects of geodynamic research. |
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