Publication Date:
2018-04-06
Description:
Magma is transported in the crust mainly by dike intrusions. In volcanic areas, dikes can ascend
toward the free surface and also move by lateral propagation, eventually feeding flank eruptions.
Understanding dike mechanics is a key to forecasting the expected propagation and associated hazard.
Several studies have been conducted on dike mechanisms and propagation; however, a less in-depth
investigated aspect is the relation between measured dike-induced deformation and the seismicity released
during its propagation. We individuated a simple x that can be used as a proxy of the expected mechanical
energy released by a propagating dike and is related to its average thickness. For several intrusions around
the world (Afar, Japan, and Mount Etna), we correlate such mechanical energy to the seismic moment
released by the induced earthquakes. We obtain an empirical law that quantifies the expected seismic energy
released before arrest. The proposed approach may be helpful to predict the total seismic moment that will
be released by an intrusion and thus to control the energy status during its propagation and the time of
dike arrest.
Description:
Published
Description:
5486-5494
Description:
5V. Dinamica dei processi eruttivi e post-eruttivi
Description:
JCR Journal
Keywords:
dike propagation
;
deformation modeling
;
seismic release
;
04.03. Geodesy
;
04.08. Volcanology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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