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|Authors: ||Manzo, M.*|
Del Gaudio, C.*
Ricciardi, G. P.*
|Title: ||Recent deformation at Campi Flegrei caldera (Italy) detected by DinSar and leveling techniques|
|Issue Date: ||16-Apr-2007|
|Keywords: ||campi lfegrei|
|Abstract: ||The Campi Flegrei caldera, a volcanic and densely populated area located to the west
of Napoli (Italy), was characterized by rapid ground deformation during 1970-72 and
1982-84, for a total amount of 3.5 m in the city of Pozzuoli. Since 1985 a slow deflation
was active, with episodic microcrises of uplifts.
A new and consistent uplift event is now going on, beginning in November 2004, as
revealed by spatial and terrestrial geodetic techniques.
In particular, we adopt almost all the available ENVISAT ASAR data acquired from
both ascending and descending orbits during 2002-2006, to generate mean deformation
velocity maps and time series with spatial resolution of about 100 m. The maps
are computed following the Small BAseline Subset (SBAS) approach (Berardino et
al., 2002), that implements an appropriate combination of differential interferograms
generated from SAR data pairs (60 SAR images for this work).
In addition to satellite observations, we show data from the high precision levelling network of the INGV-Osservatorio Vesuviano, consisting in about 320 benchmarks.
Levelling measurements are regularly carried out on both the whole network and along
the coast line; in case of a bradyseismic crisis, the temporal sampling is strongly increased.
Both DInSAR and levelling data evidence the maximum value of the vertical displacement
near the city of Pozzuoli.
We model the observed deformation by means of 3D pressurized point-source and
extended source, performing inversions to constrain their shape and location. The resulting
sources are also compared with that inverted for the 1982-84 unrest.|
|Appears in Collections:||04.08.06. Volcano monitoring|
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