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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 136 (1991), S. 143-154 
    ISSN: 1420-9136
    Keywords: Earthquake statistics ; earthquake hazard ; Vrancea seismogenic region
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A maximum likelihood method is used to estimate the earthquake hazard parameters maximum magnitudeM max, annual activity rate λ, and theb value of the Gutenberg-Richter equation in the Vrancea (Romania) region. The applied procedure permits the use of mixed catalogs with incomplete historical as well as complete instrumental parts, the consideration of variable detection thresholds, and the incorporation of earthquake magnitude uncertainty. Our imput data, comprises 105 historical earthquakes which occurred between 984 and 1934, and a complete data file containing 1067 earthquakes which occurred during the period 1935–30 August, 1986. The complete part was divided into four subcatalogs according to different thresholds of completeness. Only subcrustal events were considered, and dependent events were removed. The obtained $$\hat b$$ value (=0.65) is at the lower range of the previously reported results, but it appears concurrent with conceptual and observational facts. The same concerns inferred value of $$\hat M$$ max = 7.8 and activity rate $$\hat \lambda $$ 4.0 = 5.34.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-0840
    Keywords: Seismic hazard ; Sannio-Matese ; TERESA project ; European Seismological Commission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The working group on ‘Test Regions for Evaluation of Methods for Seismic Hazard Assessment in Europe (TERESA)’, consisted of 15 members from 10 different European countries. Methods and experience gathered in these countries have been compared and discussed for two test areas in Europe: the Sannio-Matese region, Southern Italy, with high seismic activity, and the border region between Belgium, The Netherlands, and Federal Republic of Germany, with low activity. This paper summarizes the results for one of the test areas, Sannio-Matese. Most of the participants used statistical procedures to assess earthquake hazard, receiving results in terms of probability of occurrence for intensity as the ground-motion parameter. It was found that careful preparation of input data and parameters is the major influencing factor, therefore most of the efforts of the working group was devoted to this task. The scatter of the obtained results of the group is considerable, mainly because of the uncertainties in the data and the subjectiveness involved in the procedures. For better control of both factors, more objective methods have to be developed.
    Type of Medium: Electronic Resource
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