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Source characteristics of the 2015 M w 6.5 Lefkada, Greece, strike‐slip earthquake
Author(s) -
Melgar Diego,
Ganas Athanassios,
Geng Jianghui,
Liang Cunren,
Fielding Eric J.,
Kassaras Ioannis
Publication year - 2017
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2016jb013452
Subject(s) - hypocenter , geology , seismology , interferometric synthetic aperture radar , geodesy , slip (aerodynamics) , tide gauge , amplitude , seismic moment , aftershock , kinematics , earth's magnetic field , induced seismicity , synthetic aperture radar , physics , fault (geology) , sea level , magnetic field , remote sensing , oceanography , classical mechanics , quantum mechanics , thermodynamics
We present a kinematic slip model from the inversion of 1 Hz GPS, strong motion, and interferometric synthetic aperture radar (InSAR) data for the 2015 M w 6.5 Lefkada, Greece, earthquake. We will show that most of the slip during this event is updip of the hypocenter (10.7 km depth) with substantial slip (>0.5 m) between 5 km depth and the surface. The peak slip is ~1.6 m, and the inverted rake angles show predominantly strike‐slip motion. Slip concentrates mostly to the south of the hypocenter, and the source time function indicates a total duration of ~17 s with peak moment rate at ~6 s. We will show that a 65° dipping geometry is the most plausible due to a lack of polarity reversals in the InSAR data and good agreement with Coulomb stress modeling, aftershock locations, and regional moment tensors. We also note that there was an ~20 cm peak‐to‐peak tsunami observed at one tide gauge station 300 km away from the earthquake. We will discuss tsunami modeling results and study the possible source of the amplitude discrepancy between the modeled and the observed data at far‐field tide gauges.