Journal
NATURE GEOSCIENCE
Volume 10, Issue 6, Pages 442-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NGEO2952
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Funding
- Russian Science Foundation [14-47-00002]
- French project 'Labex UnivEarth'
- French project Universitee Sorbonne Paris Cite project 'VolcanoDynamics'
- Russian Academy of Science [AAAA-A16-116070550058-4]
- Ile-de-France region via SEASAME programme
- France-Grille
- CNRS MASTODONS programme
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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 similar to 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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