CyberShake Background Seismicity

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Goal: determine the importance of background seismicity in different parts of CA to either validate it's exclusion in CyberShake or motivate an inclusion strategy.

Calculation parameters:

  • GMPE: NGA-West2 GMPE (average of 4 models)
  • ERF: UCERF2, with and without background seismicity
  • Site Effects: Vs30 is from Wills (2015), no basin depth terms included
  • IMT is 2 second SA.
Model 10% in 50yr 2% in 50yr 1% in 50yr
Excluding Background
Ngaw2 exclude 2sec 10p in 50.png
Ngaw2 exclude 2sec 2p in 50.png
Ngaw2 exclude 2sec 1p in 50.png
Including Background
Ngaw2 include 2sec 10p in 50.png
Ngaw2 include 2sec 2p in 50.png
Ngaw2 include 2sec 1p in 50.png
Ratio Exclude/Include
Ratio ngaw2 exclude ngaw2 include 10p in 50.png
Ratio ngaw2 exclude ngaw2 include 2p in 50.png
Ratio ngaw2 exclude ngaw2 include 1p in 50.png
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