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Deep and shallow long-period volcanic seismicity linked by fluid-pressure transfer

Abstract : Volcanic long-period earthquakes are attributed to pressure fluctuations that result from unsteady mass transport in the plumbing system of volcanoes. Whereas most of the long-period seismicity is located close to the surface, the volcanic deep long-period earthquakes that occur in the lower crust and uppermost mantle reflect the activity in the deep parts of magmatic systems. Here, we present observations of long-period earthquakes that occurred in 2011-2012 within the Klyuchevskoy volcano group in Kamchatka, Russia. We show two distinct groups of long-period sources: events that occurred just below the active volcanoes, and deep long-period events at depths of ~30 km in the vicinity of a deep magmatic reservoir. We report systematic increases of the long-period seismicity levels prior to volcanic eruptions with the initial activation of the deep long-period sources that reflects pressurization of the deep reservoir and consequent transfer of the activity towards the surface. The relatively fast migration of the long-period activity suggests that a hydraulic connection is maintained between deep and shallow magmatic reservoirs. The reported observations provide evidence for the pre-eruptive reload of the shallow magmatic reservoirs from depth, and suggest that the deep long-period earthquakes could be used as a reliable early precursor of eruptions.
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https://hal-insu.archives-ouvertes.fr/insu-03748851
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Wednesday, August 10, 2022 - 9:14:13 AM
Last modification on : Friday, October 21, 2022 - 3:32:40 PM

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N. M. Shapiro, D. V. Droznin, S. Ya. Droznina, S. L. Senyukov, A. A. Gusev, et al.. Deep and shallow long-period volcanic seismicity linked by fluid-pressure transfer. Nature Geoscience, 2017, 10, pp.442-445. ⟨10.1038/ngeo2952⟩. ⟨insu-03748851⟩

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