GEOPHYSICAL RESEARCH, 2016, vol.17, no.1, pp.29-36.

Abstract  References  Full text (in Russian)

UDC 550.34.042.43

RELATIONSHIP BETWEEN MOMENT MAGNITUDE MW AND SURFACE WAVE MAGNITUDE MS FOR THE CAUCASUS REGION AND ADJACENT AREAS 

©2016 A.I. Lutikov(1,2), I.P. Gabsatarova(2)

(1) Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

(2) Geophysical Survey of RAS, Obninsk, Kaluga region, Russia 

Abstract. Using CMT and NEIC catalogues and data characterizing spectral and source parameters of earthquakes of Northern Caucasus that are published by the Geophysical Survey, Russian Academy of Sciences, correlation relationships between magnitudes MS and MW  were obtained for the Caucasus region in a surface wave magnitude range 2.2≤MS≤7.3. It was showed that for MS≤5.1 in the region studied and adjacent areas, the usage of CMT data in the construction of dependence MW (MS) is incorrect.

The basic conclusion of the work is that magnitudes MW and MS are connected by a uniform relationship in a rather wide interval: from events with MS≈2.0–2.5 up to the values of MS scale saturation. Due to limited data set available on weak and moderate earthquakes (MS≤5.1) the above conclusion can be considered as preliminary and requires verification and additional adjustment in process of updating the data.

Keywords: Earthquake catalogues, correlation relationships, moment magnitude, surface wave magnitude, scalar seismic moment.

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