Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history

Abstract The 2015/11/17 Lefkada (Greece) earthquake ruptured a segment of the Cephalonia Transform Fault (CTF) where probably the penultimate major event was in 1948. Using near-source strong motion and high sampling rate GPS data and Sentinel-1A SAR images on two tracks, we performed the inversion...

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Autores principales:	Antonio Avallone, Antonella Cirella, Daniele Cheloni, Cristiano Tolomei, Nikos Theodoulidis, Alessio Piatanesi, Pierre Briole, Athanassios Ganas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5860acb0ff7343b38f7fcf30b7fef5b8
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spelling	oai:doaj.org-article:5860acb0ff7343b38f7fcf30b7fef5b82021-12-02T15:06:16ZNear-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history10.1038/s41598-017-10431-w2045-2322https://doaj.org/article/5860acb0ff7343b38f7fcf30b7fef5b82017-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-10431-whttps://doaj.org/toc/2045-2322Abstract The 2015/11/17 Lefkada (Greece) earthquake ruptured a segment of the Cephalonia Transform Fault (CTF) where probably the penultimate major event was in 1948. Using near-source strong motion and high sampling rate GPS data and Sentinel-1A SAR images on two tracks, we performed the inversion for the geometry, slip distribution and rupture history of the causative fault with a three-step self-consistent procedure, in which every step provided input parameters for the next one. Our preferred model results in a ~70° ESE-dipping and ~13° N-striking fault plane, with a strike-slip mechanism (rake ~169°) in agreement with the CTF tectonic regime. This model shows a bilateral propagation spanning ~9 s with the activation of three main slip patches, characterized by rise time and peak slip velocity in the ranges 2.5–3.5 s and 1.4–2.4 m/s, respectively, corresponding to 1.2–1.8 m of slip which is mainly concentrated in the shallower (<10 km) southern half of the causative fault. The inferred slip distribution and the resulting seismic moment (M0 = 1.05 × 1019 N m) suggest a magnitude of M w 6.6. Our best solution suggests that the occurrence of large (M w > 6) earthquakes to the northern and to the southern boundaries of the 2015 causative fault cannot be excluded.Antonio AvalloneAntonella CirellaDaniele CheloniCristiano TolomeiNikos TheodoulidisAlessio PiatanesiPierre BrioleAthanassios GanasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Antonio Avallone Antonella Cirella Daniele Cheloni Cristiano Tolomei Nikos Theodoulidis Alessio Piatanesi Pierre Briole Athanassios Ganas Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history
description	Abstract The 2015/11/17 Lefkada (Greece) earthquake ruptured a segment of the Cephalonia Transform Fault (CTF) where probably the penultimate major event was in 1948. Using near-source strong motion and high sampling rate GPS data and Sentinel-1A SAR images on two tracks, we performed the inversion for the geometry, slip distribution and rupture history of the causative fault with a three-step self-consistent procedure, in which every step provided input parameters for the next one. Our preferred model results in a ~70° ESE-dipping and ~13° N-striking fault plane, with a strike-slip mechanism (rake ~169°) in agreement with the CTF tectonic regime. This model shows a bilateral propagation spanning ~9 s with the activation of three main slip patches, characterized by rise time and peak slip velocity in the ranges 2.5–3.5 s and 1.4–2.4 m/s, respectively, corresponding to 1.2–1.8 m of slip which is mainly concentrated in the shallower (<10 km) southern half of the causative fault. The inferred slip distribution and the resulting seismic moment (M0 = 1.05 × 1019 N m) suggest a magnitude of M w 6.6. Our best solution suggests that the occurrence of large (M w > 6) earthquakes to the northern and to the southern boundaries of the 2015 causative fault cannot be excluded.
format	article
author	Antonio Avallone Antonella Cirella Daniele Cheloni Cristiano Tolomei Nikos Theodoulidis Alessio Piatanesi Pierre Briole Athanassios Ganas
author_facet	Antonio Avallone Antonella Cirella Daniele Cheloni Cristiano Tolomei Nikos Theodoulidis Alessio Piatanesi Pierre Briole Athanassios Ganas
author_sort	Antonio Avallone
title	Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history
title_short	Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history
title_full	Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history
title_fullStr	Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history
title_full_unstemmed	Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history
title_sort	near-source high-rate gps, strong motion and insar observations to image the 2015 lefkada (greece) earthquake rupture history
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/5860acb0ff7343b38f7fcf30b7fef5b8
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Near-source high-rate GPS, strong motion and InSAR observations to image the 2015 Lefkada (Greece) Earthquake rupture history

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