Aftershock Decay Rates and Fault Zone Properties
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The rate of decay of aftershocks of earthquakes in several                 tectonic settings will be analyzed by determining the parameters                in the Modified Omori relation that fit the data best in the                    maximum liklihood sense.  The important parameter is p, the                     exponent of time, t, in the aftershock decay relation, as defined               by Omori (1894) and Utsu (1960).  The parameters are determined by              fitting the cumulative number of events up to any selected time,                using the approach developed by Ogata (1983).                                                                                                                        Analyses of a number of well-documented aftershock sequences,              described in the text of the proposal, yielded p-values from 0.7                to 1.3.  From the few cases already studied for which the moment                release pattern during the mainshock has been determined, a                     connection between the degree of uniformity of slip over the fault              surface and the consequent decay rate of the aftershocks is                     suggested.
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{'Code': '1574', 'Text': 'Geophysics'}
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