Affiliation:
1. Departmento de Geofísica Instituto Astronômico e Geofísico Universidade de São Paulo P.O. Box 30627 São Paulo, SP , Brazil
Abstract
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 ≦ R ≦ 1500 km, we find
m R = log ( A / T ) + 2.3 log R − 1.48.
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 ≦ mb < 5.
Publisher
Seismological Society of America (SSA)
Subject
Geochemistry and Petrology,Geophysics
Cited by
18 articles.
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