recent instrumental magnitude issues or magnitude: the necessary evil of statistical seismology
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Recent Instrumental Magnitude Issues or Magnitude: the Necessary Evil of Statistical Seismology. Andy Michael. Does this affect UCERF3? Still in reprocessing mode. Compute rates for M≥4, little affect there Compute b -values with smaller events, could affect that. - PowerPoint PPT PresentationTRANSCRIPT
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Recent Instrumental Magnitude Issuesor
Magnitude: the Necessary Evil of Statistical Seismology
Andy Michael
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Does this affect UCERF3?Still in reprocessing mode.Compute rates for M≥4, little affect thereCompute b-values with smaller events, could affect that
![Page 5: Recent Instrumental Magnitude Issues or Magnitude: the Necessary Evil of Statistical Seismology](https://reader036.vdocuments.mx/reader036/viewer/2022062521/5681673e550346895ddbf124/html5/thumbnails/5.jpg)
Do we need to recompute b-value with smaller events?Is there agreement that b = 1 in California (at least southern Cal.)?
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Tormann et al.
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Concluded that:remapping of magnitudes and computation of a result
(e.g. b-value) must be done many times and then take the mean of the result.
declustering should be done before remapping so that spatially and temporally localized magnitude behavior is maintained.
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UCERF3 plans: do remapping if we need to use small event magnitudes.
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UCERF4 plans: hope they are done reprocessing magnitudes!