Moment‐magnitude relations in theory and practice

The observation that motivates this study is the difference in c values in moment-magnitude relations of the form log M o -cM L + d between central and southern California. This difference is not at all related to geographical area; rather, it results from positive curvature in the log M 0 - M L plane and the relatively large number of ML 1028 dyne cm are unlikely to occur in California, and earthquakes with M 2«) California earthquakes whose spectral corner frequency lies in the "visible" bandwidth, fo < fmax'

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