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Effects of Methods of Attenuation Correction on Source Parameter Determination
 

Summary: 
Effects of Methods of Attenuation Correction on Source
Parameter Determination
Eleanor Sonley* and Rachel E. Abercrombie
Department of Earth Sciences, Boston University, Boston, Massachusetts, USA
We quantify the effects of using different approaches to model individual earth-
quake spectra. Applying different approaches can introduce significant variability
in the calculated source parameters, even when applied to the same data. To com-
pare large and small earthquake source parameters, the results of multiple studies
need to be combined to extend the magnitude range, but the variability introduced
by the different approaches hampers the outcome. When studies are combined, there
is large uncertainty and large scatter and some systematic differences have been
neglected. We model individual earthquake spectra from repeating earthquakes
(M~2) at Parkfield, CA, recorded by a borehole network. We focus on the effects of
trade-offs between attenuation (Q) and corner frequency in spectral fitting and the
effect of the model shape at the corner frequency on radiated energy. The trade-off
between attenuation and corner frequency can increase radiated energy by up to
400% and seismic moment by up to 00%.
InTRoduCTIon
determining whether or not the earthquake source process

  

Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University

 

Collections: Geosciences