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Authors: | Mazzoli, Stefano* Nardò, Sergio* Ascione, Alessandra* Di Donato, Valentino* Terranova, Carlo* Vilardo, Giuseppe* |
Title: | Fault motion reversals predating the Mw 6.3 2009 L'Aquila earthquake: insights from synthetic aperture radar data | Journal: | Journal of the Geological Society | Series/Report no.: | 4/178 (2021) | Publisher: | Geological society of London | Issue Date: | 2021 | DOI: | 10.1144/jgs2020-016 | URL: | https://pubs.geoscienceworld.org/jgs/article-lookup?doi=10.1144/jgs2020-016 | Keywords: | PsInSAR Earthquake Precursor L'Aquila earthquake Ground displacement |
Subject Classification: | 04.07. Tectonophysics 04.06. Seismology |
Abstract: | 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. |
Appears in Collections: | Article published / in press |
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2021_Mazzuoli_JGS_AQUILA_ACCEPTED.pdf | Open Access from april 22 | 2.98 MB | Adobe PDF | View/Open |
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