Quasilinear Earthquake Chains in Groups of Seismic Events Baikal Rift System

Abstract

Identification of a large number of quasi-linear chains of earthquakes in the epicentral seismicity field of the Baikal region and their study showed that among these chains there may be not only chains of “migration” earthquakes, but also chains formed during a random spatio-temporal distribution of earthquakes. In this work, using a statistical analysis of the distribution of distances between epicenters, the possibility of forming chains of “migrations” within groups of seismic events is shown and their distribution is studied. It is noted that chains in groups of earthquakes are distinguished not only by the distribution of distances, but also by the time between them. The formation of chains of earthquakes was established in the areas of the following groups of earthquakes: Busiyingol and 1976 and 1991. in the same area, the South Baikal, Kyakhtinsky, Kichersky earthquakes of the Tompudinsky series, Oldongsinsky and Charudinsky groups. It is shown that these chains were formed during the implementation of these groups. In the identified areas of concentration of chains of grouping seismicity, a connection can be traced between the location and direction of the chains with the strike of fault zones, near-fault cracks and the orientation of nodal planes in earthquake sources.