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The problem of maintaining uniform magnitude scales is important in seismology. It is shown that the surface wave magnitudes measured in the Soviet Union (MLH) are in good agreement with those from Pasadena, Berkeley and Palisades, and are considered to be a good continuation of M as used by Gutenberg and Richter in their catalogue. Body wave magnitudes, however, show a systematic difference between USCGS and Russian determinations, the Coast and Geodetic Survey values being significantly lower. Several possible reasons for this are examined and it is concluded that the regular contribution of certain stations (BMO, UBO, TFO and WMO) which consistently report lower magnitudes than most stations is a major cause of the discrepancy.* When determining A / T by records of common type instruments, an amplitude between the second and the thud peaks has been measured, and when using SKM records, the maximum amplitude in the range of 20 s has been taken.' revised values ' de Pasadena, Publ. Bur. Central Seism. Intern., Trav. Sc; A, 18. and Khalturin, V. I., 1967. seismic waves from earthquakes.

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