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Magnitude: The relation of M_L to m_bLg

DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES SAINT LOUIS UNIVERSITY, P.O. BOX 8099, LACLEDE STATION SAINT LOUIS, MISSOURI 63156

Abstract

The m_bLg magnitude developed by Nuttli (1973) for the Central United States is adapted to other regions of the world by incorporating a specific term for the spatial coefficient of anelastic attenuation . Using region-specific values, m_bLg values are determined for earthquakes occurring near the WWSSN stations BKS, GSC, and DUG. A comparison of the m_bLg values with published M_L magnitudes shows that these two magnitude scales are essentially equivalent between magnitudes 3 to 5. Because of this observation, we now have a direct way of comparing Eastern and Western United States earthquake sizes for the purpose of adapting western strong motion data bases to the east and also for understanding teleseismic magnitude biases.

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