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Abstract <p>The changes in volcanic seismicity regimes by the example of the 2006 eruption of Augustine Volcano in Alaska are analyzed. 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 chamber; such a regime has a high value of the slope of the magnitude–frequency distribution and a low degree of clustering. The second process can presumably be associated with an dike intrusion and local destruction of rocks under the pressure of the dike. This process has a slope parameter of the magnitude–frequency distribution close to one and shows a high level of clustering before the most significant events, which are followed by quiescence.</p>

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Two Types of Seismic Activity Prior to the 2006 Eruption of Augustine Volcano in Alaska

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • E. M. Grekov,
  • P. N. Shebalin,
  • V. B. Smirnov

摘要

Abstract

The changes in volcanic seismicity regimes by the example of the 2006 eruption of Augustine Volcano in Alaska are analyzed. 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 chamber; such a regime has a high value of the slope of the magnitude–frequency distribution and a low degree of clustering. The second process can presumably be associated with an dike intrusion and local destruction of rocks under the pressure of the dike. This process has a slope parameter of the magnitude–frequency distribution close to one and shows a high level of clustering before the most significant events, which are followed by quiescence.