Publication Date:
2012-02-03
Description:
A study of the deformation pattern of Mount Etna volcano based on the results from the Permanent
Scatterers (PS) technique is reported. Ground motion data provided by the interferometric synthetic aperture
radar (InSAR) PS technique from 1995 to 2000 are compared and validated by GPS data. An analysis
of the ascending and descending line of sight (LOS) components of ground velocities has yielded detailed
ground deformation maps and cross sections. This analysis allows detection and constraint of discontinuities
in the surface velocity field. LOS velocities have then been combined to calculate the vertical and horizontal
(E‐W) ground velocities. A wide inflation of the edifice has been detected on the western and
northern flanks (over an area of about 350 km2). A seaward motion of the eastern and southern flanks
has also been measured. PS data allows the geometry and kinematics of the several blocks composing
the unstable flanks to be defined even in the highly urbanized areas, and their displacement rates have been
measured with millimeter precision. This analysis reveals the extension of some features beyond their field
evidences and defines new important features. The results of this work depict a new comprehensive kinematic
model of the volcano highlighting the gravitational reorganization of the unbuttressed volcanic pile
on its slippery clay basement on the southern flank, but an additional drag force due to a strong subsidence
of the continental margin facing the Etna volcano is necessary to explain the PS velocity field observed on
the eastern flank.
Description:
Published
Description:
Q02002
Description:
1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
volcano-tectonics
;
faults
;
flank instability
;
volcano spreading
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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