Source parameters of some large earthquakes in the eastern Mediterranean region based on an itertive maximum entropy technique

Stavrakakis, G.; Blionas, S. V.

doi:10.1007/bf00876813

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…Low stress drops for large Greek earthquakes have also been reported by many authors who employed Brune's model (KULHANEK and MEYER, 1979;SOUFLERIS and STEWART, 1981;KIM et al, 1984;KIRATZE et al, 1985;STAVRAKAKIS et al, 1989;STAVRAKAKIS and BLIONAS, 1990). For the same events, Madariaga's model provides stress drops almost ten times larger than those determined by Brune's model and the question is whether these results are model dependent or whether low stress drop events are a reality for many seismogenic regions in Greece.…”

Section: Resultsmentioning

confidence: 83%

Seismic Source Parameters from a New Dial-up Seismological Network in Greece

Chouliaras

Stavrakakis

1997

Pure appl. geophys.

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A regional dial-up PT telemetric network of eight digital short-period seismic stations has been in full operation since the beginning of 1995 in Greece. During the first year of full operation, three destructive earthquake sequences struck different regions of central and northern Greece. The dial-up network managed to successfully record more than 85% of these seismic events including foreshocks, main shocks and aftershocks, and 45 of these events were selected in order to determine their seismic source parameters by spectral analysis. The results show that seismic moment correlates very well with earthquake magnitude, fault radius and fault displacement. The determined scaling relations are in general agreement with those obtained by other studies for Greek earthquakes that used different methodologies. Since digital seismic instrumentation is now expanding in Greece, these first results from spectral analysis of digital short-period data can be considered useful for future seismic hazard studies.

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Section: Resultsmentioning

confidence: 83%

Seismic Source Parameters from a New Dial-up Seismological Network in Greece

Chouliaras

Stavrakakis

1997

Pure appl. geophys.

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“…We found 12 earthquakes with reported Brune's stress drop values derived from teleseismic body waves spectra (Papazachos et al, 1988;Stavrakakis and Blionas, 1990;Chouliaras and Stavrakakis, 1997;Stavrakakis et al, 2002;Benetatos et al, 2002;Papadimitriou, personal communication, 2007Papadimitriou, personal communication, , 2008 and two earthquakes with reported fault dimensions and seismic moments (Kiratzi et al, 1985). The Brune's stress drop values for these two events (no.…”

Section: Data and Analysismentioning

confidence: 71%

Power law relationship between parameters of earthquakes and precursory electrical phenomena

Dologlou

2008

Nat. Hazards Earth Syst. Sci.

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Abstract.A number of Seismic Electric signals data have been accumulated during the last two decades that also includes the signals observed before the magnitude 6 class earthquakes that occurred in Greece very recently i.e., the first two months of 2008.Using all the available data we investigate whether a possible interconnection exists between the lead time of Seismic Electric Signals and the stress drop of subsequent earthquakes. We show that for "non thrust" earthquakes a power law relation emerges with an exponent value around 0.29, the possible physical meaning of which is discussed. This value is very close to the range of critical exponents that govern the fracture processes and is also comparable with the value of the slope, found much earlier by the VAN group, in the linear relation between the logarithm of the SES amplitude and the earthquake magnitude.

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“…A notable exception is represented by the M w =6.4 Achaia -Elia event of 2008 in Western Peloponnesus (Ganas et al, 2009;Feng et al, 2010) where the stress drop is estimated as high as 5 MPa, but this is likely to be caused by an anomalously high rupture energy. For the Jan. 17, 1983 M=7.0 event near Kephalonia, Stavrakakis and Blionas (1990) report a stress drop of 1.4 MPa. One may expect that an average of the dynamic stress drops measured for individual earthquakes should be not larger than the regional stress drop we have estimated.…”

Section: Accepted Manuscriptmentioning

confidence: 94%

Stress drop at the Kephalonia Transform Zone estimated from the 2014 seismic sequence

et al. 2016

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The Kephalonia Transform Zone (KTZ) is a seismically active dextral transform fault decoupling the extensional deformed area of the Ionian Abyssal Plain and the compressional deformed area of the Mediterranean Ridge. We estimate a prominent steady state strain rate of 225±20 nstrain/year across the KTZ from the mean velocities of permanent Global Navigation Satellite System (GNSS) stations in East Italy and West Greece, which confirms previous estimates. Based on the regional statistical seismicity and using the local Gutenberg-Richter relation we investigate the energetic balance between stress accumulated as a consequence of the continuous dextral shear deformation, and the average stress released by shallow seismicity. If the maximum expected magnitude is M w = 7.4, the estimated a and b parameters of the local Gutenberg-Richter relation and the geodetically determined shear-strain rate set an upper limit to the regional stress drop ≤ 0.4 MPa. We verify these values by analyzing a seismic sequence on the KTZ between January and February 2014, which culminated in the M w = 6.09 event of Jan. 26, and the M w = 6.14 event of Feb. 3. The estimated epicenters lie within a few kilometers from each other, on the western side of the Kephalonia Island, at a hypocentral depth ≤ 10 km. The measured coseismic displacements of GNSS stations in this area fit the expected surface dislocation, which can be predicted for an elastic half-space using the measured fault-plane solutions as input. If the hypocenters of the aftershocks are taken as indicator of optimal dextral shear-stress orientation, then a low regional deviatoric stress of 0.4 MPa, that is comparable with the maximum regional stress drop estimated above, is required for the Coulomb stress to match the pattern of the aftershocks of the 2014 sequence. As a consequence, we conclude that the regional deviatoric stress and the seismically released shear stress are in close balance in the KTZ seismic province. Highlights GPS strain rate, statistical seismicity and tectonics of the Kephalonia Transform Zone

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Source parameters of some large earthquakes in the eastern Mediterranean region based on an itertive maximum entropy technique

Cited by 6 publications

References 29 publications

Seismic Source Parameters from a New Dial-up Seismological Network in Greece

Seismic Source Parameters from a New Dial-up Seismological Network in Greece

Power law relationship between parameters of earthquakes and precursory electrical phenomena

Stress drop at the Kephalonia Transform Zone estimated from the 2014 seismic sequence

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