Magnitude determination of earthquakes in the Baltic Shield

Wahlström, Rutger; Ahjos, T.

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Magnitude determination of earthquakes in the Baltic Shield

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Wahlström, Rutger
2.6 Seismic Hazard and Stress Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Ahjos, T.
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Wahlström, R., Ahjos, T. (1984): Magnitude determination of earthquakes in the Baltic Shield. - Annales Geophysicae, 2, 5, 553-558.

https://gfzpublic.gfz-potsdam.de/pubman/item/item_232384

Abstract

Station corrections have been introduced into the M"SUB L"-scale hitherto used for Baltic Shield earthquakes. The new formula is valid for Benioff and Grenet seismograph stations in Finland and Sweden. An extension of the magnitude scale to distances as small as 30 km is made by adding the constant 0.31 to the equation. Correlating the instrumental magnitude with macroseismic parameters, a relationship between the radius of areas of perceptibility (km) and maximum intensity has been obtained which is especially useful in quantification of historical earthquakes. For stations of the Finnish Seismic Array (FINSA) equipped with Geotech S13 seismographs, formulae has been obtained from which magnitudes may now be assigned to weak shocks, which were not possible to quantify previously. -from Authors