Seismic moments of earthquakes in the Baikal rift zone as indicators of recent geodynamic processes

Nonlinear geodynamics of the Baikal rift system: An evolution scenario with triple equilibrium bifurcation

“…With the above approach, the structure and dynamics of current lithospheric stress in the Baikal rift associated with seismogenesis is simulated in terms of Brune's model (Brune, 1970) from a dataset of almost 70,000 M LH ≥ 2.0 events making up 95% of earthquakes recorded between 1968 and 1994 (Klyuchevskii, 2004). The stress state is imaged as a discrete yearly time series in curves ( Fig.…”

“…1A and B) and in the phase spaces of the coordinates c j and M j 0 (Figs. 2 and 3, respectively), where j is the year running from 1968 to 1994; c j is a coefficient that relates the logarithmic seismic moment of an earthquake with its magnitude (lg M 0 ± S = (A ± S a ) + (c ± S c )M LH , where A and c are the coefficients, and S, S a , and S c are the rms deviations), for all events recorded during the j-th year; M j 0 is the mean annual For more details of regional seismicity, the procedure of calculating the seismic moment, and correlation equations see Klyuchevskii (2004).…”

“…The available reconstructions of lithospheric stress in the Baikal rift system are based mainly on focal mechanisms of M LH ≥ 3.5 earthquakes (Doser, 1991;Solonenko et al, 1997); since recently the database has been extended with seismic moments of M LH ≥ 2.0 events (Klyuchevskii, 2004). The space-time pattern of seismic moments of earthquakes that happened in the Baikal rift between 1968 and 1994 records three significant events of stress change (Klyuchevskii, 2004). Joint analysis of earthquake mechanisms, seismic moments, and seismicity distribution indicates that large earthquakes (M > 5.5) may be a response to stress reversal associated with increase in geodynamic activity (Klyuchevskii, 2007).…”

“…The investigated piece of stress history in the Baikal rift, with three stress change events (Klyuchevskii, 2004(Klyuchevskii, , 2005a, resembles emergent behavior of a self-organizing unstable system (Klyuchevskii, 2007) subject to formation of dissipative structures (Prigogine and Kondepudi, 1998). The examples of complex behavior (Nicolis and Prigogine, 1989) known in the literature include various processes of self-organization in physico-chemical and biological systems.…”

Generation of infrasonic signals during earthquakes under Lake Hovsgool (Northern Mongolia) on December 5, 2014

“…Source parameters of the major earthquake and aftershock are determined by D. Brune's model (model of dynamic crack) [Brune, 1970], usually used to find parameters of seismic sources in the Baikal region [Klyuchevskii, Demyanovich, 2002;Klyuchevskii, 2004;Klyuchevskii, 2008]. The dynamic parameters of earthquake source are calculated from formulas…”