Publication Date:
2019-12-05
Description:
We investigated the contribution of earthquake-induced surface movements to the ground
displacements detected through Interferometric Synthetic Aperture Radar (InSAR) data, after the Mw
3.9 Ischia earthquake on 21 August 2017. A permanent displacement approach, based on the limit
equilibrium method, allowed estimation of the spatial extent of the earthquake-induced landslides
and the associated probability of failure. The proposed procedure identified critical areas potentially
affected by slope movements partially overlapping the coseismic ground displacement retrieved by
InSAR data. Therefore, the observed ground displacement field is the combination of both fault slip
and surficial sliding caused by the seismic shaking. These findings highlight the need to perform
preliminary calculations to account for the non-tectonic contributions to ground displacements before
any estimation of the earthquake source geometry and kinematics. Such information is fundamental
to avoid both the incorrect definition of the source geometry and the possible overestimation of the
coseismic slip over the causative fault. Moreover, knowledge of the areas potentially affected by
slope movements could contribute to better management of a seismic emergency, especially in areas
exposed to high seismic and hydrogeological risks.
Description:
Published
Description:
0303
Description:
2T. Deformazione crostale attiva
Description:
JCR Journal
Keywords:
Ischia earthquake
;
InSAR
;
landslides
;
ground displacements
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
