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Seismic moments, local magnitudes, and coda-duration magnitudes for earthquakes in central California



Seismic moments, local magnitudes, and coda-duration magnitudes for earthquakes in central California



Bulletin of the Seismological Society of America 74(2): 439-458



Onscale seismograms recorded by the U. S. Geological Survey's (USGS) central California seismic network (CALNET) have been used to estimate the seismic moment M (sub O) and local magnitude M (sub L) for earthquakes of 1< or =M (sub L) < or =4 located on the San Juan Bautista and Parkfield sections of the San Andreas fault, the Coyote Lake section of the Calaveras Fault, the Sargent Fault, and near Livermore. These data, together with M (sub O) and M (sub L) estimates for 4< or = M (sub L) < or =6 earthquakes in these areas, cannot be fit with a single linear log M (sub O) -versus-M (sub L) relation. Rather, the data are consistent with log M (sub O) = 1.5 M (sub L) + 16 for 3< or = M (sub L) < or =6, with log M (sub O) = 1.2M (sub L) + 17 for 1 1/2 < or = M (sub L) < or = 3 1/2 and with a slope of 2/3 to 1 for 1/2< or = M (sub L) < or = 1 1/2. Whereas USGS coda duration magnitude M (sub D) is consistent with M (sub L) for 1 1/2 < or = M (sub L) < or = 3 1/4, M (sub D) is larger than M (sub L) at M (sub L) < or = 1 1/2 and smaller than M (sub L) at M (sub L) < or = 3 1/4. Log M (sub O) can be estimated to a precision of 0.2 for 1 < or = M (sub D) < or = 3 1/2 earthquakes in central California by applying log M (sub O) = 1.2 M (sub D) + 17 to the M (sub D) that have been routinely published by the USGS.--Modified journal abstract.

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