The Weak-Motion Modeling of the Skyros Island,Aegean Sea,M w = 6.5 Earthquake of July 26, 2001 |
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| Authors: | Zahradník Ji?í |
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| Institution: | (1) Department of Geophysics, Faculty of Mathematics and Physics, Charles University, V Hole ovi kách 2, 180 00 Prague 8, Czech Republic |
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| Abstract: | The earthquake was modeled using regional broad-band stations in Greece (epicentral distances up to 340 km). Inversion of the amplitude spectra of complete waveforms (0.05–0.08 Hz), later confirmed by the forward waveform modeling, provided strike = 150°, dip = 70°, rake = 10°, scalar moment M
o = 4.1e18 Nm, and depth of 8 km. As the aftershock distribution had the same strike, the earthquake was interpreted as a left-lateral strike slip. The fault length was estimated by combining observed mainshock spectra and synthetic spectra of a weak event, representing impulse response of the medium. This gave the fault length estimate of 16 to 24 km. Similar results were obtained by means of a true M
w = 5 aftershock. The waveform modeling (0.05–0.20 Hz) was performed for the 20 × 10 km finite-extent fault, with a homogenous slip of 0.63 m. It showed that the rupture propagation along the 150° strike was predominantly unilateral, from NW to SE. |
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| Keywords: | Skyros earthquake Aegean Sea focal mechanism source inversion directivity rupture propagation |
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