A premonitory pattern of earthquakes in northern Greece

Papazachos, B. C.; Tsapanos, Theodoros M.; Panagiotopoulos, Dimitris

doi:10.1038/296232a0

Cited by 44 publications

(110 citation statements)

References 7 publications

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“…The historical development of the permanent seismological station installations by NOA in Greece are reviewed by Bath (1983) and more recently by Papazachos and Papazachou (2003). The first traditional WWSSN station in Greece began operating in Athens at the Institute of Geodynamics (NOA) in 1962 and a year later the second station was installed in Patras, to be followed by the installation of four more stations on the Greek islands: Crete, Kefalonia, Lesvos and Rodos.…”

Section: History Of Network Development At Noamentioning

confidence: 99%

Investigating the earthquake catalog of the National Observatory of Athens

Chouliaras

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. The earthquake catalog of the National Observatory of Athens (NOA) since the beginning of the Greek National Seismological Network development in 1964, is compiled and analyzed in this study. The b-value and the spatial and temporal variability of the magnitude of completeness of the catalog is determined together with the times of significant seismicity rate changes.It is well known that man made inhomogeneities and artifacts exist in earthquake catalogs that are produced by changing seismological networks and in this study the chronological order of periods of network expansion, instrumental upgrades and practice and procedures changes at NOA are reported. The earthquake catalog of NOA is the most detailed data set available for the Greek area and the results of this study may be employed for the selection of trustworthy parts of the data in earthquake prediction research.

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Section: History Of Network Development At Noamentioning

confidence: 99%

Investigating the earthquake catalog of the National Observatory of Athens

Chouliaras

2009

Nat. Hazards Earth Syst. Sci.

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“…This probability for false alarms of the D-AS model has been estimated by the following procedure, which is described in detail in . The original earthquake catalogue for a selected region (e.g., Aegean area) was initially declustered for standard aftershocks using a relation for the aftershock sequence duration (Papazachos 1974a, b;Papazachos and Papazachou 1997) and a similar relation for the aftershock area, depending on the mainshock magnitude. Then, on the basis of the declustered catalogue, the application of a Poisson time distribution for the occurrence times, and the Gutenberg-Richter relation for the magnitude distribution in each seismic zone of this area, the corresponding random epicenter distributions in space and time were estimated.…”

Section: Model Uncertaintiesmentioning

confidence: 99%

Present patterns of decelerating–accelerating seismic strain in South Japan

et al. 2009

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Decelerating generation of preshocks in a narrow (seismogenic) region and accelerating generation of other preshocks in a broader (critical) region, called decelerating-accelerating seismic strain (D-AS) model has been proposed as appropriate for intermediate-term earthquake prediction. An attempt is made in the present work to identify such seismic strain patterns and estimate the corresponding probably ensuing large mainshocks (M ≥ 7.0) in south Japan (30)(31)(32)(33)(34)(35)(36)(37)(38) • N, 130-138 • E). Two such patterns have been identified and the origin time, magnitude, and epicenter coordinates for each of the two corresponding probably ensuing mainshocks have been estimated. Model uncertainties of predicted quantities are also given to allow an objective for-

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“…Seismic energy E is derived using the relationship, logE=1.5 M s +4.7, proposed by Papazachos and Papazachou (1997) for the Greek territory. In these estimates the standard error is given by the relationship σ E =σ M /sqrt(N ), where σ M =0.2, and σ E relationship modified as σ logE =0.4343/σ E .…”

Section: Seismic Parameters and Algorithm Descriptionmentioning

confidence: 99%

“…Papazachos and Papazachou, 1997). Because of this rich earthquake catalogues are available in that region particularly in the time interval from 1990 up to the present.…”

Section: Introductionmentioning

confidence: 99%

New tool for the spatio-temporal variation analysis of seismic parameters

Papadopoulos

Baskoutas

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. In this paper a new research tool called FastBEE (Fast Estimation of Expected Big Earthquake) is proposed, for the analysis of three basic seismic parameters, (the number of earthquakes N , b-value, and the seismic energy released in the form logE 2/3 ), in order to examine their spatiotemporal variation behavior. The developed research tool is suited to analyze earthquake catalogs and it comprise new interactive visualization techniques for the exploration of the results. The tool was tested in several seismic active areas of the Hellenic territory and a case study of its applicability is presented.It is observed that the results of the seismicity parameters analysis show a clear temporal fluctuation, with respect to their mean values. Such a behavior can be interpreted as the result of the geodynamic process acting in the region. In several cases the observed significant changes can be related to strong earthquakes, so that they can be considered as precursor indicating the preparation stage for an impending strong earthquake activity.

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A premonitory pattern of earthquakes in northern Greece

Cited by 44 publications

References 7 publications

Investigating the earthquake catalog of the National Observatory of Athens

Investigating the earthquake catalog of the National Observatory of Athens

Present patterns of decelerating–accelerating seismic strain in South Japan

New tool for the spatio-temporal variation analysis of seismic parameters

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