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Open AccessArticle

Coseismic Ground Deformation Reproduced through Numerical Modeling: A Parameter Sensitivity Analysis

1
Department of Earth and Environmental Sciences, University of Pavia, Pavia I-27100, Italy
2
Department of Geosciences, University of Massachusetts, Amherst, MA 01003, USA
3
CRUST (Centro inteRUniversitario per l’analisi SismoTettonica tridimensionale con applicazioni territoriali), Pavia I-27100, Italy
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(9), 370; https://doi.org/10.3390/geosciences9090370
Received: 21 June 2019 / Revised: 17 August 2019 / Accepted: 22 August 2019 / Published: 25 August 2019
(This article belongs to the Special Issue Seismic Sequence in Mediterranean Region)
Coseismic ground displacements detected through remote sensing surveys are often used to invert the coseismic slip distribution on geologically reliable fault planes. We analyze a well-known case study (2009 L’Aquila earthquake) to investigate how three-dimensional (3D) slip configuration affects coseismic ground surface deformation. Different coseismic slip surface configurations reconstructed using aftershocks distribution and coseismic cracks, were tested using 3D boundary element method numerical models. The models include two with slip patches that reach the surface and three models of blind normal-slip surfaces with different configurations of slip along shallowly-dipping secondary faults. We test the sensitivity of surface deformation to variations in stress drop and rock stiffness. We compare numerical models’ results with line of sight (LOS) surface deformation detected from differential SAR (Synthetic Aperture Radar) interferometry (DInSAR). The variations in fault configuration, rock stiffness and stress drop associated with the earthquake considerably impact the pattern of surface subsidence. In particular, the models with a coseismic slip patch that does not reach the surface have a better match to the line of sight coseismic surface deformation, as well as better match to the aftershock pattern, than models with rupture that reaches the surface. The coseismic slip along shallowly dipping secondary faults seems to provide a minor contribution toward surface deformation. View Full-Text
Keywords: coseismic ground deformation; active fault geometry; DInSAR; numerical models; sensitivity analysis coseismic ground deformation; active fault geometry; DInSAR; numerical models; sensitivity analysis
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Panara, Y.; Toscani, G.; Cooke, M.L.; Seno, S.; Perotti, C. Coseismic Ground Deformation Reproduced through Numerical Modeling: A Parameter Sensitivity Analysis. Geosciences 2019, 9, 370.

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