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Roumelioti, Z.
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Roumelioti, Z.
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- PublicationOpen AccessSource parameters of the M 6.5 Skyros Island (North Aegean Sea) earthquake of July 26, 2001(2002)
; ; ; ; ;Benetatos, C.; Department of Geophysics, Aristotle University of Thessaloniki, Greece ;Roumelioti, Z.; Department of Geophysics, Aristotle University of Thessaloniki, Greece ;Kiratzi, A.; Department of Geophysics, Aristotle University of Thessaloniki, Greece ;Melis, N.; Institute of Geodynamics, National Observatory of Athens, Greece; ; ; Teleseismic body wave modelling, time domain moment tensor inversion of regional waveforms and spectral analysis of the far-field P-wave pulses are used to derive the source parameters of the July 26, 2001 Skyros earthquake (M 6.5). Its epicentre is located south of the Sporades Islands in the North Aegean Sea (Greece). Previous focal mechanism solutions indicate motion on strike-slip faults. The time domain moment tensor inversion is applied for the first time to the regional waveforms of the recently established broadband network in Greece. Its application gave results which are highly consistent with teleseismic waveform modelling. The results of this study, in combination with the distribution of aftershocks, indicate left-lateral strike slip motion on a NW-SE striking fault with parameters: fault plane (strike = 151°, dip = 83°, rake = 7°) and auxiliary plane (strike = 60°, dip = 84°, rake = 173°), depth 12 km and M 0 = 5.98e18 N m. Moreover, the time domain moment tensor inversion technique yielded a pure double couple source with negligible CLVD. The spectral analysis of the far-field P-wave pulses resulted in a fault length L ~ 32 km, stress drop ~ 9 bars and average displacement u ~ 30 cm.These values are in very good agreement with those estimated from empirical scaling relations applicable to the Aegean area.170 229 - PublicationOpen AccessA comparative study of a stochastic and deterministic simulation of strong ground motion applied to the Kozani-Grevena (NW Greece) 1995 sequence(2000-10)
; ; ; ; ;Roumelioti, Z.; Department of Geophysics, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Kiratzi, A.; Department of Geophysics, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Theodulidis, N.; Institute of Engineering Seismology and Earthquake Engineering, Thessaloniki, Greece ;Papaioannou, C.; Institute of Engineering Seismology and Earthquake Engineering, Thessaloniki, Greece; ; ; We present the results of a comparative study of two intrinsically different methodologies, a stochastic one and a deterministic one, performed to simulate strong ground motion in the Kozani area (NW Greece). Source parameters were calculated from empirical relations in order to check their reliability, in combination with the applied methodologies, to simulate future events. Strong ground motion from the Kozani mainshock (13 May, 1995, M w = 6.5) was synthesized by using both the stochastic method for finite-fault cases and the empirical Green’s function method. The latter method was also applied to simulate a Mw = 5.1 aftershock (19 May, 1995). The results of the two simulations computed for the mainshock are quite satisfactory for both methodologies at the frequencies of engineering interest (> ~ 2 Hz). This strengthens the idea of incorporating proper empirical relations for the estimation of source parameters in a priori simulations of strong ground motion from future earthquakes. Nevertheless, the results of the simulation of the smaller earthquake point out the need for further investigation of regional or local, if possible, relations for estimating source parameters at smaller magnitude ranges155 1033