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Bulletin of the Seismological Society of America; February 1972; v. 62; no. 1; p. 1-11
© 1972 Seismological Society of America
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The relationship between teleseismic body-wave magnitude m and local magnitude ML from New Zealand earthquakes

S. J. GIBOWICZ

SEISMOLOGICAL OBSERVATORY GEOPHYSICS DIVISION DEPARTMENT OF SCIENTIFIC AND INDUSTRIAL RESEARCH, WELLINGTON, New Zealand

Abstract

Relationships between the magnitudes ML and m for 123 New Zealand earthquakes occurring between 1950 and 1967 and having 4.6 less double equals ML less double equals 7.3 have been found. Deep- and shallow-focus shocks were considered separately. There is a linear relationship between ML and m, the slope being the same for both deep and shallow events. Values of ML for deep events are consistently 0.5 magnitude larger than those for shallow events having the same value of m. The relationship between m and ML for New Zealand earthquakes differs significantly from that obtained by Gutenberg and Richter in California.




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