Journal
TECTONOPHYSICS
Volume 693, Issue -, Pages 47-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2016.10.021
Keywords
Earthquake dynamics; Seismicity and tectonics; Radar interferometry; Lefkada
Categories
Funding
- European Space Agency [4484]
- Ministry of Education, Youth and Science of Bulgaria [3/29]
- Ministry of National Education, France [3/29]
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On 2003 August 14, a M-w = 6.2 earthquake occurred offshore the Lefkada Island in the eastern Ionian Sea, one of the most seismically active areas in Europe. The earthquake caused extended damages in the island, and a number of ground failures, especially along the north-western coast. Seven ascending ENVISAT/ASAR images are used to process six co-seismic interferograms. The ROI-PAC package is used for interferogram generation with the SRTM DEM applied in a two-pass method. The formation of the co-seismic pairs is limited due to the existence of one pre-seismic image only. Dense vegetation is covering the island, which is an obstacle in getting good coherence, since C-band images are used. Nevertheless, ground deformation, of >56 mm (two fringes) in the line of sight of the satellite, is detected in all six co-seismic interferograms. By inversion of the data from the observed fringes, a best fitting model of the activated fault is calculated assuming a dislocation in an elastic half space. The inferred fault is a pure dextral strike-slip fault, dipping 59 +/- 5 degrees eastward, 16 +/- 2 km long and 10 +/- 2 km wide. It is located north of the fault of the M-w = 6.5 2015 November 17 earthquake, and a 10-15 km gap remains between the two faults. The 2003 fault does not reach the surface and its upper edge is at a depth of 3.5 +/- 1 km. No evidence is found of slip south of the Lefkada Island as suggested by some seismological studies. (C) 2016 Elsevier B.V. All rights reserved.
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