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OFFICE OF EARTHQUAKE STUDIES U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025
Abstract
Seismic moments Mo and local magnitudes ML for earthquakes near Oroville, California imply the linear log seismic moment-local magnitude relation
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Coda durations 
for short-period, vertical-component seismographs located in the epicentral region are related to local magnitude using two linear log -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 )2 is sufficient (in the sense that rms error in log10Mo is 0.2 to 0.3 units) to relate and Mo for 18 
log10Mo < 22. Coefficients for the above -ML and -Mo relationships are established for three seismographs of differing response
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