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  • 1
    ISSN: 1573-0840
    Keywords: Earthquake ; catalogues ; frequency-intensity relations ; return ; periods ; Sudetes ; Western Carpathians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The new procedure of earthquake hazard evaluation developed by Kijko and Sellevoll is tested and applied for the border region of Czechoslovakia and Poland. The new method differs from the conventional approach. It incorporates the uncertainty of earthquake magnitudes, and accepts mixed data containing only large historical events and recent, complete catalogues. Seismic hazard has been calculated for nine regions determined in the border area. In the investigated area, data of historical catalogues are uncertain or, in many cases, the epicentral intensities are unknown. Thus, a number of assumptions have to be adopted in data preparation of catalogues since the year 1200. The calculated values of parameters b in the Gutenberg-Richter frequency-intensity relation as well as the return periods, seem to be reasonable and are generally confirmed by the results obtained from catalogues for the last 80–130 years.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2020-02-12
    Description: A seismic hazard evaluation has been conducted for Fennoscandia, including Norway, Sweden, Finland, Denmark, areas of Russia, and adjacent sea areas. Severel subregions were considered. Data were taken from a Fennoscandian earthquake catalog comprising both macroseismic and instrumental observations. The analysis was based on a maximum likelihood approach using incomplete historical and complete instrumental data, different detection thresholds, and assessment of earthquake magnitude uncertainty. The obtained parameters correspond well to the charcteristics seismicity features of inspected regions. However, discrepancies between the data used and the data model behind the applied method were observed: both the patterns of earthquake occurrence and the reporting of historical events tend to deviate from the model. Differences in output can be expected according to the decisions to deal with these discrepancies. -from Authors
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 3
    Publication Date: 2020-02-12
    Description: The maximum magnitude, the activity rate, and the Gutenberg-Richter b parameter as earthquake hazard parameters, have been evaluated for Sweden. The maximum likelihood method permits the combination of historical and instrumental data. The catalog used consists of 1100 earthquakes in the time interval 1375-1989. The number of annually expected earthquakes with magnitude equal to or larger than 2.4 is 1.8 for the whole of southern Sweden, 1.3 for the Lake Vanern region, 3.7 for northern Sweden, and 2.4 for the region along the Gulf of Bothnia. The maximum expected regional magnitude is calculated to 4.9 (0.5) for a time span of 615 years for southern Sweden and the Lake Vanern subregion, and 4.3 (0.5) for a time span of 331 years for northern Sweden and the Gulf of Bothnia subregion. However, several historic earthquakes with magnitude above 5 in nearby areas of Norway indicate that the seismic potential may be higher. -from Authors
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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