Strombolian explosions; GPinSAR monitoring; volcanic tremor; very long period activity
Abstract :
[en] We present the integration of seismic and Ground‐Based Interferometric Synthetic Aperture Radar system (GBInSAR) displacement data at Stromboli Volcano. Ground deformation in the area of summit vents is positively correlated with both seismic tremor amplitude and cumulative amplitudes of very long period (VLP) signals associated with Strombolian explosions. Changes in VLP amplitudes precede by a few days the variations in ground deformation and seismic tremor. We propose a model where the arrival of fresh, gas‐rich magma from depth enhances gas slug formation, promoting convection and gas transfer throughout the conduit system. At the shallowest portion of the conduit, an increase in volatile content causes a density decrease, expansion of the magmatic column and augmented degassing activity, which respectively induce inflation of the conduit, and increased tremor amplitudes. The temporal delay between increase of VLP and tremor amplitudes/conduit inflation can be interpreted in terms of the different timescales characterizing bulk gas transfer versus slug formation and ascent.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Di Traglia, Federico; Università degli Studi di Firenze - UniFI > Department of Earth Sciences
Cauchie, Léna ; Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Saccorotti, Gilberto; Istituto Nazionale di Geofisica e Vulcanologia > Pisa
Casagli, Nicola; Università degli Studi di Firenze - UniFI
Language :
English
Title :
Decrypting geophysical signals at Stromboli Volcano (Italy): Integration of seismic and Ground‐Based InSAR displacement data
Publication date :
April 2014
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Wiley, Washington, United States - District of Columbia
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