Determination of local magnitude and calibration of magnitude scales for 
earthquakes in the Baltic shield

Wahlström, Rutger; Ahjos, T.

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Determination of local magnitude and calibration of magnitude scales for 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. (1982): Determination of local magnitude and calibration of magnitude scales for earthquakes in the Baltic shield, (Report N1-82).

https://gfzpublic.gfz-potsdam.de/pubman/item/item_232370

Abstract

Station corrections have been introduced into the M"SUB L"-scale hitherto used for Baltic Shield earthquakes. This increases the consistency of the scale. The new formula has the design: M"SUB L"(UPP) = log a + log V(T) + 1.61 log DELTA - 3.22 + C"SUB I" + C"SUB s", where a = ground amplitude (mu m), V(T) = Wood-Anderson short-period seismometer magnification at period T, DELTA = epicentral distance (km), C"SUB I" = instrument type constant and C"SUB s" = station correction. The formula is valid for Benioff and Grenet seismograph stations in Finland and Sweden. An extension of the magnitude scale to distances as small as 30km has been made.-from Authors