Abstract
This study is concerned with seismicity variations in Kamchatka and the Kuril Islands for the period 1962–2009; the effects of large earthquakes on the seismicity of adjacent areas are taken into account. The 1997 Kronotskii earthquake was followed by seismicity decreases in most areas over Kamchatka, which is presumably related to decreased tectonic stresses. After the 2007 Simushir earthquake synchronization and periodicities in seismicity were identified, indicating increased instabilities and the likelihood of a large event in Kamchatka in the near future. The instability of seismic regions is discussed within the framework of the theory of nonequilibrium dynamical systems. We suggest successive phases in the occurrence of seismological precursors.
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