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| Titel |
GPS kinematic field in Central and Northern Italy |
| VerfasserIn |
Nicola Cenni, Paolo Baldi, Enzo Mantovani, Marcello Viti, Daniele Babbucci |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250075688
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| Zusammenfassung |
| The GPS observation of more than 350 continuous GPS stations located in the Central and
Northern Italian peninsula have been analyzed in order to reconstruct the present kinematic
pattern in the area. Several sites (about 100) are managed by public companies
and scientific research institutions aimed at performing accurate monitoring of
earth surface movements, other sites are managed by public institutions and private
agencies to support mapping activities, rescue and emergency services and real-time
positioning (VRS and RTK).We have processed with GAMIT software all the available
data for the period 2001-2012. The network is divided into 21 sub–networks, each
including at least the six common stations. The IGS precise ephemerides have been
included in the processing with tight constraints, such as the Earth Orientation
Parameter (EOP). The daily loosely constrained solutions of the 21 clusters have
been combined into a unique solution by the GLOBK software. Such solution has
been then aligned into the ITRF2008 reference frame by a weighted six parameters
transformation (three translation and three rotation), using the ITRF2008 coordinates and
velocities of the five high quality common IGS stations (CAGL, GRAZ, MATE,
WTZR and ZIMM). The sites with an observation time span less than two years
have been excluded from the analysis of kinematic pattern, because it is hard to get
a robust estimate of rate, seasonal signals and steps with less than two years of
observation.
The horizontal kinematic pattern has been analyzed in order to gain information about
the present short term deformation pattern of this region. This analysis may have
significant implications for the recognition of seismic zones most prone to next strong
earthquakes.
The vertical velocity field has been also considered in this study. It is largely recognized
that vertical movements in the Central – Northern Italy may be considered as the overall
result of three main causes: tectonic processes, ground settlement and anthropic activities,
whose respective contributions are expected to be rather heterogeneous over the study
area.
The daily position time series of the sites located in the Eastern sector of Po Plain have
been analyzed in order to evaluate the coseismic and possible pre and postseismic effects of
the Emilia sequence earthquakes (May-June 2012). |
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