Publication Date:
2017-04-04
Description:
Volcanic rift zones, characterized by repeated dike emplacements, are expected to delimit the
upper portion of unstable flanks at basaltic edifices. We use nearly two decades of InSAR
observations excluding wintertime acquisitions, to analyze the relationships between rift
zones, dike emplacement and flank instability at Etna. The results highlight a general
eastward shift of the volcano summit, including the northeast and south rifts. This steadystate
eastward movement (1-2 cm/yr) is interrupted or even reversed during transient dike
injections. Detailed analysis of the northeast rift shows that only during phases of dike
injection, as in 2002, does the rift transiently becomes the upper border of the unstable flank.
The flank's steady-state eastward movement is inferred to result from the interplay between
magmatic activity, asymmetric topographic unbuttressing, and east-dipping detachment
geometry at its base. This study documents the first evidence of steady-state volcano rift
instability interrupted by transient dike injection at basaltic edifices.
Description:
Partially funded by INGV and the Italian DPC (DPC-INGV project V4 “Flank”). ERS
and ENVISAT SAR data were provided by ESA through the Cat-1 project no. 4532 and the
GEO Supersite initiative. The DEM was obtained from the SRTM archive. ERS-1/2 orbits
are courtesy of the TU-Delft, The Netherlands. SAR data processing has been done at IREACNR,
partially carried out under contract “Volcanic Risk System (SRV)” funded by the
Italian Space Agency (ASI).
Description:
Published
Description:
L20311
Description:
1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
1.10. TTC - Telerilevamento
Description:
3.2. Tettonica attiva
Description:
3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
Description:
3.6. Fisica del vulcanismo
Description:
4.3. TTC - Scenari di pericolosità vulcanica
Description:
JCR Journal
Description:
restricted
Keywords:
flank instability
;
rift zones
;
04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
;
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
;
04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
;
04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
;
04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
;
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
;
04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
;
05. General::05.08. Risk::05.08.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
