Paper Info
Title
New Insights into Long-Term Aseismic Deformation and Regional Strain Rates from GNSS Data Inversion: The Case of the Pollino and Castrovillari Faults.
Abstract
We present a novel inverse method for discriminating regional deformation and long-term fault creep by inversion of GNSS velocities observed at the spatial scale of intraplate faults by exploiting the different spatial signatures of these two mechanisms. In doing so our method provides a refined estimate of the upper bound of the strain accumulation process. As case study, we apply this method to a six year GNSS campaign (2003-2008) set up in the southern portion of the Pollino Range over the Castrovillari and Pollino faults. We show that regional deformation alone cannot explain the observed deformation pattern and implies high geodetic strain rate, with a WSW-ENE extension of86 +/- 41x10-9/yr. Allowing for the possibility of fault creep, the modelling of GNSS velocities is consistent with their uncertainties and they are mainly explained by a shallow creep over the Pollino fault, with a normal/strike-slip mechanism up to 5 mm/yr. The regional strain rate decrease by about 70 percent and is characterized by WNW-ESE extension of24 +/- 28x10-9/yr. The large uncertainties affecting our estimate of regional strain rate do not allow infering whether the tectonic regime of the area is extensional or strike-slip, although the latter is slightly more likely.
Year
DOI
Venue
2020
10.3390/rs12182921
REMOTE SENSING
Keywords
DocType
Volume
regional deformation,fault creep,GNSS velocities,inverse theory
Journal
12
Issue
Citations 
PageRank 
18
0
0.34
References 
Authors
0
7
Name
Order
Citations
PageRank
Gabriele Cambiotti100.34
Mimmo Palano211.98
Barbara Orecchio300.34
Anna Maria Marotta400.34
Riccardo Barzaghi5627.05
Giancarlo Neri600.34
Roberto Sabadini700.34