Two types of seismic activity prior the 2006 eruption of Alaska's Augustine volcano

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Abstract

The changes in volcanic seismicity regimes on example of the 2006 eruption of the Augustine volcano in Alaska are analyzed in the paper. During the long-term volcanic swarm preceding the eruption, two processes with different seismicity regimes were identified. The first can be associated with general radial deformations caused by an increase in pressure in the underground magma pit; such a regime has a high value of the slope of the magnitude-frequency distribution and a low degree of clustering. The second process, presumably, can be associated with a dike intrusion and local destruction of rock under the pressure of the dike. This process has a slope parameter of the magnitude-frequency distribution close to 1 and shows a high level of clustering before the most significant events, which are followed by lulls.

About the authors

E. M. Grekov

Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences; M.V. Lomonosov Moscow State University, Department of the Physics of the Earth, Faculty of Physics

Email: grekov.em16@physics.msu.ru
Moscow, Russia; Moscow, Russia

P. N. Shebalin

Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences

Moscow, Russia

V. B. Smirnov

M.V. Lomonosov Moscow State University, Department of the Physics of the Earth, Faculty of Physics; Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences

Moscow, Russia; Moscow, Russia

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