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Sci Rep. 2017 Sep 4;7(1):10358. doi: 10.1038/s41598-017-10431-w.

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

Author information

1
Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Via di Vigna Murata 605, Rome, 00143, Italy. antonio.avallone@ingv.it.
2
Istituto Nazionale di Geofisica e Vulcanologia, sezione di Roma1, Via di Vigna Murata 605, Rome, 00143, Italy.
3
Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Via di Vigna Murata 605, Rome, 00143, Italy.
4
Institute of Engineering Seismology and Earthquake Engineering (ITSAK-EPPO), P.O. Box 53, FInikas, Thessaloniki, 55102, Greece.
5
Ecole Normale Supérieure, PSL Research University, Laboratoire de Géologie - UMR CNRS 8538, 24 Rue Lhomond, Paris, 75005, France.
6
National Observatory of Athens, Institute of Geodynamics, P.O. Box 20048, Athens, 11810, Greece.

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.

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