Publication Date:
2021-07-13
Description:
The millimetre accuracy of Synthetic Aperture Radar (SAR) measurements and related multi-temporal data analyses
provide fundamental information on surface displacements caused by strong earthquakes. The multi-temporal analysis of SAR
interferometry data allows for the geometry, kinematics and temporal behaviour of earthquake-generating faults to be better
constrained, and is being acknowledged as a promising technique in the field of earthquake precursors. We used SAR data
obtained by multi-temporal interferometric techniques such as Permanent Scatterers (PS) interferometry for the investigation of
pre- to post-seismic ground displacements in the region struck by theMw 6.3, 2009 L’Aquila earthquake.We analysed Europen
Remote Sensing (ERS) and Envisat PS-datasets from ascending and descending orbits, and COSMO-SkyMed PS-datasets
from descending orbit, collectively covering a 〉 20 year long time span. On a yearly scale, a reversal of motions that affected the
hanging-wall and footwall blocks of the earthquake-generating fault is detected. In particular, the hanging-wall block is
characterized by pre-seismic uplift – which we document as being independent of any hydrological control – and eastward
horizontal motion for about six years, followed by subsidence and westward motion (starting six to eight months prior to the
earthquake). We suggest that such a ground displacement pattern may represent an earthquake precursor signal.
Description:
Published
Description:
jgs2020-016
Description:
2T. Deformazione crostale attiva
Description:
7T. Variazioni delle caratteristiche crostali e "precursori"
Description:
JCR Journal
Keywords:
PsInSAR
;
Earthquake Precursor
;
L'Aquila earthquake
;
Ground displacement
;
04.07. Tectonophysics
;
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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