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Exploitation of high‐density DInSAR data points of the Umbria‐Marche (Italy) 1997 seismic sequence for fault characteristics
Author(s) -
Dalla Via G.,
Crippa B.,
Toraldo Serra E. M.,
Giacomuzzi G.,
Sabadini R.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030718
Subject(s) - geology , slip (aerodynamics) , seismology , crust , sequence (biology) , fault (geology) , high resolution , spatial distribution , geodesy , geophysics , remote sensing , physics , genetics , biology , thermodynamics
High spatial resolution DInSAR data for the Umbria Marche 1997 seismic sequence are exploited by relaxing constraints derived from datasets of different nature, such as seismologically derived fault dimensions. DInSAR data are thus inverted for a realistic slip distribution over the faults, in terms of depth distribution and roughness, which allows us to relocate the main faults and to minimize the misfit between the vertical displacement pattern derived from DInSAR and model predictions. Our analysis reveals that slip affected not only the shallowest part of the fault system but also its deepest part, rupturing the whole seismogenic layer of the crust down to 10 km, reaching slip values up to 30 cm at the base of the seismogenic layer. Misfit is reduced by a factor of two with respect to previous analyses based on a smaller number of digitized fringe points.