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| Titel |
Local magnitude scale in Slovenia |
| VerfasserIn |
J. Bajc, Ž. Zaplotnik, M. Živčić, M. Carman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Improving seismic networks performances: from site selection to data integration (EGU2012 SM1.3/GI1.7 session) ; Nr. 34 (2013-04-30), S.23-28 |
| Datensatznummer |
250019088
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| Publikation (Nr.) |
 copernicus.org/adgeo-34-23-2013.pdf |
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| Zusammenfassung |
| In the paper a calibration study of the local magnitude scale in Slovenia is
presented. The Seismology and Geology Office of the Slovenian Environment Agency
routinely reports the magnitudes MLV of the earthquakes recorded by the
Slovenian seismic stations. The magnitudes are computed from the maximum vertical
component of the ground velocity with the magnitude equation that was derived some
thirty years ago by regression analysis of the magnitudes recorded by a Wood-Anderson
seismograph in Trieste and a short period seismograph in Ljubljana. In the study the
present single magnitude MLV equation is replaced by a general form of the
Richter local magnitude MWA equation. The attenuation function and station-component
corrections that compensate the local effects near seismic stations are determined from the
synthetic Wood-Anderson seismograms of a large data set by iterative least-square method. The
data set used consists of approximately 18 000 earthquakes during a period of 14 yr, each
digitally recorded on up to 29 stations. The derived magnitude equation is used to
make the final comparison between the new MWA magnitudes and the routinely
calculated MLV magnitudes. The results show good overall accordance
between both magnitude equations. The main advantage of the introduction of
station-component corrections is the reduced uncertainty of the local magnitude
that is assigned to a certain earthquake. |
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