Abstract
In 2014–2018, four strong earthquakes occurred in the Ionian Sea, Greece. After these events, a rich aftershock sequence followed. More analytically, according to the manual solutions of the National Observatory of Athens, the first event occurred on 26 January 2014 in Cephalonia Island with magnitude ML = 5.8, followed by another in the same region on 3 February 2014 with magnitude ML = 5.7. The third event occurred on 17 November 2015, ML = 6.0 in Lefkas Island and the last on 25 October 2018, ML = 6.6 in Zakynthos Island. The first three of these earthquakes caused moderate structural damages, mainly in houses and produced particular unrest to the local population. This work determines a seismic moment tensor for both large and intermediate magnitude earthquakes (M > 4.0). Geodetic data from permanent GPS stations were analyzed to investigate the displacement due to the earthquakes.
Highlights
A detailed analysis of both seismological and geodetic data of the Ionian Islands is performed in this study
Recent studies based on precise epicenters and focal mechanisms confirm the existence of this seismically active fault of Cephalonia that runs parallel to the west coast of Lefkas [3]
GNSS stations green tions and major faults from [56], the red triangles represent the permanent GNSS stations with arrows representing the displacement from Lefkas Earthquake (Mw 6.4) PONT 42.2 cm, SPAN 9.2 cm, green arrows representing the displacement from Lefkas Earthquake (Mw 6.4) PONT 42.2 cm, VLSM 2 cm
Summary
A detailed analysis of both seismological and geodetic data of the Ionian Islands is performed in this study. It is the first time that such an extensive time period analysis with the latest state-of-the-art software and usage of updated data like the ITRF 2014 reference frame has been applied to Greece’s most seismogenic area This area is characterized by continuous seismic activity and frequent occurrence of large earthquakes (M > 6.0). The first seismological indications for horizontal sliding movements in the study area were developed in the 1980s based on epicenters [10] and focal mechanisms of strong earthquakes and aftershocks of 17/01/1983 M = 7.0 and 23/03/1983 M = 6.2, [11,12]. Recent studies based on precise epicenters and focal mechanisms confirm the existence of this seismically active fault of Cephalonia that runs parallel to the west coast of Lefkas [3].
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