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Bulletin of the Seismological Society of America; February 1983; v. 73; no. 1; p. 237-246
© 1983 Seismological Society of America
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A regional magnitude scale for Brazil

MARCELO ASSUMPÇÃO

DEPARTMENTO DE GEOFÍSICA INSTITUTO ASTRONÔMICO E GEOFÍSICO UNIVERSIDADE DE SÃO PAULO, P.O. BOX 30627, SÃO PAULO, SP, Brazil

Abstract

An empirical amplitude-distance curve is determined for earthquakes registered at regional distances in conterminous Brazil. This curve is the basis of a regional magnitude scale, mR, using the maximum amplitude in the whole P-wave train with periods in the range 0.1 to 1.0 sec. In the distance range 200 less double equals R less double equals 1500 km, we find


Formula

This scale gives much better agreement with the teleseismic mb magnitudes than the values calculated using the regional Q factors of Gutenberg and Richter (1956). It is shown that, despite using a wide range of periods, mR should be a good estimate of the 1-sec teleseismic mb in the range 2 less double equals mb < 5.






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