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Bulletin of the Seismological Society of America; June 1987; v. 77; no. 3; p. 987-995
© 1987 Seismological Society of America
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Investigation of mb and MS formulas for the Western United States and their impact on the MS/mb discriminant

MARVIN D. DENNY, STEVEN R. TAYLOR and EILEEN S. VERGINO

EARTH SCIENCES DIVISION LAWRENCE LIVERMORE NATIONAL LABORATORY UNIVERSITY OF CALIFORNIA, LIVERMORE, CALIFORNIA 94550

Abstract

The impact of regional mb and MS formulas on regional MS/mb discrimination is investigated using a large number of Western United States earthquakes and explosions. Comparison of NEIS mb values with regional mb values shows a systematic error of 1.2. Additionally, a simple analysis of variance shows that the variance of the magnitude estimate is reduced when log(A) replaces log(A/T). These changes, along with a refinement of the distance correction, yield a new regional mb for the Western United States given by mb = log(A) + 2.4 log({Delta}) – 3.95 + cj, where A = 0 to peak amplitude in nanometers, {Delta} is the distance in kilometers, and ci is a station correction. Usage of this formula improves the performance of regional MS/mb discrimination by a factor of 2 to 6.




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