Publikationsdatum:
2017-04-04
Beschreibung:
Slip distribution on fault planes is usually retrieved by geodetic data assuming the local
crust as an elastic, homogeneous and isotropic half-space. Realistic complexities such as non-homogeneous
elastic structure and topographic relief can be handled only by numerical methods. However, such
elaborated models are computationally expensive and are usually implemented for forward modelling rather
than for inversion purposes. On the other hand, spatially dense geodetic data (e.g. DInSAR displacement
maps) often reveal complex patterns of coseismic deformation, pointing out the oversimplification of the
analytical models. We develop a procedure to perform inversion of geodetic data based on Finite Element
(FE) method, accounting for a more realistic description of the Earth crust, e.g. medium heterogeneity,
anisotropy, topographic relief. FE computed Green Functions are implemented in an inversion framework to
constrain the fault slip distribution in complex media. The method is applied to the 2009 L’Aquila earthquake.
Three DInSAR maps of coseismic displacement from ENVISAT and COSMO-Skymed satellites are inverted
simultaneously. The FE model includes the heterogeneities of the local crust. Results from inversions
highlight the non-negligible influence of the medium structure: homogeneous and heterogeneous models
show discrepancies in the fault slip distribution values up to 20%.
Beschreibung:
Unpublished
Beschreibung:
San Francisco, USA
Beschreibung:
3.1. Fisica dei terremoti
Beschreibung:
open
Schlagwort(e):
seismicity
;
geodesy
;
finite element
;
inversion
;
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
Poster session
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