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  • 1
    Electronic Resource
    Electronic Resource
    Coda-Q Distribution In the Iberian Peninsula (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 100 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Several attenuation studies have established a frequency dependence law of the anelastic attenuation factor Q in the form Q=Qo(f/fo)v for the approximate 1–10 Hz frequency range. We propose a method that leads to the determination of Qo, which is a function of the reference frequency fo, and the real exponent v with a single station. to carry out the problem we determine a set of master curves as a function of v. We discuss the method, and the different features of the master curves, when it is applied to the complicated regions of the Iberian Peninsula and to several instruments with different responses. Using this new method and the seismographic stations available in the Iberian Peninsula we have mapped iso-Q0 lines, at a reference frequency of 1 Hz, applying inversion methods. the Q0 values determined for Iberia vary between about 100 and about 600. Values close to 100 correspond to the southern part of Iberia. In general, Qo values increase from south to north with values about 600 near the NW part of Iberia. the Pyrenees Mountains and adjacent areas present Q0 values between about 200 and about 350. These results suggest a strong Q0 lateral variation in Iberia. A considerable frequency dependence of coda-Q has also been determined. the v values vary between 0.3 and 0.8. the Q0 values obtained in the Iberian Peninsula show very good agreement with several Q0 values obtained in other regions of the world. Comparison between the iso-Q0 lines and other geophysical parameters, like regional variations of Pn velocities, heat flow, isoseimal intensity distribution and crustal thickness, indicates that lower Q0 values are associated with higher isoseismal intensity attenuation, higher heat flow, lower Pn velocities and thinner crust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb02486.x
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of two methods for seismic hazard assessment in a low-seismicity area (1992)
    Springer
    Natural hazards 6 (1992), S. 39-49 
    Details
    ISSN: 1573-0840
    Keywords: Seismic hazard ; comparison of methods ; low seismicity area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The EGO method, developed by Egozcue et al. and the SRAMSC method, originally developed by Cornell and later programmed by McGuire, to assess the seismic hazard, are compared for the low seismicity area ‘Belgium, The Netherlands, and NW Germany’. Using the same input data, the results of the EGO method without the majority criterion and the SRAMSC method with upper bound XII agree very well. The influence of the zoning is investigated for the EGO method. It is not necessary to define the zones for the EGO method so strictly as for the SRAMSC method, but too wide zones can give bad results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162098
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Seismic hazard computations for regions with low earthquake activity — A case study for the Belgium, The Netherlands and NW Germany area (1989)
    Springer
    Natural hazards 2 (1989), S. 229-236 
    Details
    ISSN: 1573-0840
    Keywords: TERESA project ; seismic hazard ; comparison of algorithms ; low earthquake activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The algorithms to evaluate seismic hazard, used and/or developed by five teams participating in the TERESA project, applied to the low seismicity area ‘Belgium, The Netherlands and NW Germany’ are compared. The main differences in the results can be explained by the majority criterion of Egozcue et al. (1989), the differences in the upper bound and zonification and, in some cases, by a higher attenuation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127314
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Assessment of seismic hazard for the Sannio-Matese area of Southern Italy — A summary (1989)
    Springer
    Natural hazards 2 (1989), S. 217-228 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00127313
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Seismic hazard assessment in TERESA test areas based on a Bayesian technique (1989)
    Springer
    Natural hazards 2 (1989), S. 249-265 
    Details
    ISSN: 1573-0840
    Keywords: Bayesian method ; seismic hazard uncertainty ; Sannio-Matese ; northern Rhine region ; TERESA project
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A method based on Bayesian techniques has been applied to evaluate the seismic hazard in the two test areas selected by the participants in the ESC/SC8-TERESA project: Sannio-Matese in Italy and the northern Rhine region (BGN). A prior site occurrence model (prior SOM) is obtain from a seismicity distribution modeled in wide seismic sources. The posterior occurrence model (posterior SOM) is calculated after a Bayesian correction which, basically, recovers the spatial information of the epicenter distribution and considers attenuation and location errors, not using source zones. The uncertainties of the occurrence probabilities are evaluated in both models. The results are displayed in terms of probability and variation coefficient contour maps for a chosen intensity level, and with plots of mean return period versus intensity in selected test sites, including the 90% probability intervals. It turns out that the posterior SOM gives a better resolution in the probability estimate, decreasing its uncertainty, especially in low seismic activity regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127316
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Estimation of seismic hazard parameters in TERESA test areas (1989)
    Springer
    Natural hazards 2 (1989), S. 289-306 
    Details
    ISSN: 1573-0840
    Keywords: TERESA Project ; earthquake catalogues ; seismic hazard
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A general overview of some of the problems involved in earthquake catalogue handling is given as part of the works carried out into the ESC/SC8-TERESA project related with the seismic hazard assessment in two selected test areas: Sannio-Matese in Italy and the northern Rhine region (BGN). Furthermore, the necessary input data to be used in the calculation of seismic hazard has been obtained, including earthquake source zones and their seismic hazard parameters. The importance is pointed out of detailed analysis of seismic catalogues, mainly in relation to the use of aftershock information, the historical records of the region, and the possible temporal and spatial variation of seismicity, which could have an important influence on short-term hazard assessment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127318
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of seismic hazard at Roermond, The Netherlands: A comparison of results after the 13 April 1992 earthquake (1996)
    Springer
    Natural hazards 13 (1996), S. 297-300 
    Details
    ISSN: 1573-0840
    Keywords: return period ; seismic hazard ; Roermond earthquake ; The Netherlands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Mean return periods, 〈RP〉, for the site of Roermond, The Netherlands, as calculated by different methods, are compared, and its quality evaluated by a simple two-tail test of hypothesis. Results show that 〈RP〉 values by the EGO-method are statistically more likely. They can be considered, despite their broad 90% probability intervals, and for the site and data used, more reliable, since the Roermond earthquake was not an unusual or surprising event for the Lower Rhine Embayment area, where earthquakes of comparable size have occurred since the 18th century.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215820
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    Paper (German National Licenses)
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