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  • 1
    Electronic Resource
    Electronic Resource
    Seismic sequences in Greece interpreted in terms of barrier model (1985)
    [s.l.] : Nature Publishing Group
    Nature 315 (1985), S. 212-214 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] According to the barrier model, segmented ruptures could occur in a seismic fault, that is, slip could occur in cracks during the fault rupture process, while the region between cracks remains unbroken after the rupture. A rupture front may be stopped by a barrier, but elastic waves generated by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/315212a0
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial Distribution of Time-independent Seismicity in China (1999)
    Springer
    Pure and applied geophysics 154 (1999), S. 101-119 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Seismicity, b value, China.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The seismicity in the territory of China, a seismotectonically complicated region, has been examined by using three complete samples of earthquakes which occurred during the last two centuries (1800–1995). The b value of the Gutenberg-Richter relation was estimated by using this data sample. Taking into account the fact that the b value is spatially more stable than the a value, the b values were calculated at the nodes of a normal grid superposing on the entire area studied, and their distribution was examined. The results showed that the b value increases smoothly from 0.4 in inner-Mongolia to 0.8 in the east, south and southwest of China with higher values (b〉0.8) in the Taiwan region. Furthermore, keeping fixed the obtained b values, the a value distribution was also examined. In order to display more detailed information about the seismicity, smaller cell surface (10,000 km2) for the calculation of the a values was chosen. The mean return periods for different cutoff magnitudes were also calculated for each of these small cells. It was observed that the mean return periods are the shortest ones in China, which are 10 and 50 years for the magnitude larger than or equal to 6.0 and 7.0, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050223
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  • 3
    Electronic Resource
    Electronic Resource
    Unified Local Magnitude Scale for Earthquakes of South Balkan Area (2000)
    Springer
    Pure and applied geophysics 157 (2000), S. 765-783 
    Details
    ISSN: 1420-9136
    Keywords: Key Words: Local magnitudes, south Balkan area, b-value.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —A homogeneous earthquake catalog spanning 1964–1995 for the southern Balkan area is presented, by expressing the size of the earthquakes in a unified local magnitude scale. The strategy followed to produce this catalog is also presented. Local magnitudes calculated by six Balkan seismological centers (ATH, THE, ISK, TIR, TTG, SKO) have been used in order to obtain relations between the estimated M L values from the Greek seismological centers (ATH and THE) and the remaining four Balkan stations. Since it was found that local magnitudes estimated by ATH and THE are almost identical, they have been used as one data set so as to correlate with the data of each one of the remaining four seismological stations. Based on the proposed relations, a unified local magnitude, M LGR, is given for each earthquake of the regional catalog. A published scaling relation between the M L values from ATH and THE networks and the corresponding seismic moment magnitude, M w , was used in combination with the above relations, in order to enable the conversion of any M L value from any station into M w . The catalog completeness has been checked and the b-value has been calculated for the complete data sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001117
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  • 4
    Electronic Resource
    Electronic Resource
    Seismic source-parameter relations for earthquakes in Greece (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 27-41 
    Details
    ISSN: 1420-9136
    Keywords: fault area ; seismic moment ; stress drop ; magnitude
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A data set of nineteen, mainly shallow, moderate to large earthquakes, which occurred in the Aegean and the surrounding area, has been used to derive empirical relations for kinematic fault parameters. Thus the relations between seismic momentM 0 and magnitudeM s andm b and betweenM 0 andM s and fault dimensionsS andL have been determined. From these relations and theoretical ones it was deduced that earthquakes in the Aegean and the surrounding events, chiefly interplate, are characterized by low average stress drop values. Values of Δσ ranging from 1 to 30 bar are consistent with the data. It was also found that, in general terms, most of the data obey the geometrical similarity conditionL=2w, whereL is the fault length measured along the strike andw is its width measured along the dip. For strike-slip faults, however, the conditionL=4w seems to hold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877047
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  • 5
    Electronic Resource
    Electronic Resource
    Probabilities of occurrence of large earthquakes in the Aegean and surrounding area during the period 1986–2006 (1987)
    Springer
    Pure and applied geophysics 125 (1987), S. 597-612 
    Details
    ISSN: 1420-9136
    Keywords: Probabilistic earthquake prediction ; Aegean area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Repeat times of large shocks are obtained for 17 seismic fracture zones of the Aegean and surrounding area, from times of historic and present century earthquakes. The mean standard deviation of the repeat times is approximately 50% of any one observation. A probabilistic approach is then used to forecast the likelihood of large future earthquakes in each fracture zone, using as input the time of the last large shock, the average repeat time and its standard deviation. Shallow and intermediate depth earthquakes are examined separately. The calculated probabilities are high for the entire Hellenic arc, both for shallow and intermediate depth seismicity, for the area of Leucas island (Ionian), of Lesbos island (Aegean), for Patraikos-west Corinthiakos Gulfs, for Evoikos Gulf as well as for southern Bulgaria. The probability estimates based on the most recent large earthquakes, involve a number of basic physical assumptions and we would think that they provide a semi-stochastic approach to the problem of earthquake prediction in Greece.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879574
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  • 6
    Electronic Resource
    Electronic Resource
    Travel time residuals in southeastern Europe (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 221-231 
    Details
    ISSN: 1420-9136
    Keywords: Travel-time residuals ; Southeastern Europe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The Pn travel time relative residuals, in respect to a crustal model of the Aegean area, have been determined for 103 permanent seismological stations in southeastern Europe, western Turkey and the Middle East. The values of these residuals are considered to depend mainly on the crustal thickness beneath the seismological stations. Based on these values seven regions with different crustal thickness, varying between 31 Km and 42 Km, have been defined. The crust in these regions is continental. A region with very high negative residuals has been defined in the Middle East (Egypt, Israel, Lebanon). These negative residuals are attributed to different crustal structure of the eastern Mediterranean (oceanic crust with an extra thick sedimentary layer) and not the crustal thickness at the station sites. Independently from the interpretation, these Pn residuals can be used successfully to considerably improve (up to 2 Km) the determination of the earthquake foci locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877018
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  • 7
    Electronic Resource
    Electronic Resource
    Properties of the 1979 Monte Negro (southwest Yugoslavia) seismic sequence (1984)
    Springer
    Pure and applied geophysics 122 (1984), S. 25-35 
    Details
    ISSN: 1420-9136
    Keywords: Fault plane solution ; epicenter migration ; barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Focal properties of the Monte Negro earthquake (15 April 1979,M=7.1) and its seismic sequence (foreshocks and aftershocks), which occurred near the southwestern coast of Yugoslavia, are investigated. Fault plane solutions of the main shock and its largest aftershock (24 May 1979,M=6.3) and the spatial distribution of the shocks of this sequence show that the seismic fault strikes about southeast-northwest (parallel to the coast) and dips northeast (towards the continent). It is a strike-slip left-lateral fault with a considerable thrust component. Its length is 95 km and its width 12 km. An aseismic belt, which separated the aftershock foci into two groups (the northwestern and southeastern), is interpreted as a section of the fault that slipped smoothly during the main shock. The aftershock foci were barriers where stress had been induced. One of these barriers broke later and produced the largest aftershock of 24 May.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879647
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  • 8
    Electronic Resource
    Electronic Resource
    Long-term earthquake prediction in the circum-pacific convergent belt (1997)
    Springer
    Pure and applied geophysics 149 (1997), S. 173-217 
    Details
    ISSN: 1420-9136
    Keywords: Time-dependent seismicity ; seismogenic region ; circum-Pacific convergent belt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Investigation of the time-dependent seismicity in 274 seismogenic regions of the entire continental fracture system indicates that strong shallow earthquakes in each region exhibit short as well as intermediate term time clustering (duration extending to several years) which follow a power-law time distribution. Mainshocks, however (interevent times of the order of decades), show a quasiperiodic behaviour and follow the ‘regional time and magnitude predictable seismicity model’. This model is expressed by the following formulas $$\begin{gathered} \log T_t = 0.19 M_{\min } + 0.33 M_p - 0.39 \log m_0 + q \hfill \\ M_f = 0.73 M_{\min } - 0.28 M_p + 0.40 \log m_0 + m \hfill \\ \end{gathered} $$ which relate the interevent time,T t (in years), and the surface wave magnitude,M f , of the following mainshock: with the magnitude,M min, of the smallest mainshock considered, the magnitude,M p , of the preceded mainshock and the moment rate,m 0 (in dyn.cm.yr−1), in a seismogenic region. The values of the parametersq andm vary from area to area. The basic properties of this model are described and problems related to its physical significance are discussed. The first of these relations, in combination with the hypothesis that the ratioT/T t , whereT is the observed interevent time, follows a lognormal distribution, has been used to calculate the probability for the occurrence of the next very large mainshock (M s ≥7.0) during the decade 1993–2002 in each of the 141 seismogenic regions in which the circum-Pacific convergent belt has been separated. The second of these relations has been used to estimate the magnitude of the expected mainshock in each of the regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945167
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