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A regional magnitude scale for 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, m R , 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 m b 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, m R should be a good estimate of the 1-sec teleseismic m b in the range 2 ≦ m b