Abstract
abstract Seismic moments Mo and local magnitudes ML for earthquakes near Oroville, California imply the linear log seismic moment-local magnitude relation log 10 ( M o ) = ( 1.21 ± 0.03 ) M L + ( 17.02 ± 0.07 ) for 17 < log 10 M o < 25. Coda durations τ for short-period, vertical-component seismographs located in the epicentral region are related to local magnitude using two linear log τ-ML segments with point of intersection at ML ≂ 1.5. The rms error is 0.1 to 0.2 units of magnitude. A relation of the form log Mo = a1 + a3 (log τ)2 is sufficient (in the sense that rms error in log10Mo is 0.2 to 0.3 units) to relate τ and Mo for 18 ≦ log10Mo < 22. Coefficients for the above τ-ML and τ-Mo relationships are established for three seismographs of differing response
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