Abstract
Abstract Broad-band seismograms are used to determine the magnitude spectrum of an earthquake. The spectrum represents the velocity amplitude density spectrum at the earthquake source, scaled in magnitude units. A method is presented to routinely utilize the magnitude spectrum for the independent determination of the seismic energy released, the seismic moment, the fault length and the stress drop. The method is applied to six earthquakes in three different regions. It is found that the stress drop is higher for the intraplate earthquake than for the interplate earthquakes. Also it is observed that the largest foreshock of an interplate earthquake has a clearly higher stress drop, than the largest aftershock. The results indicate that there are measurable regional differences in source parameters and that there are time variations in the parameters within each region.
Published Version
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