M8 PSHA Analysis

The M8 PSHA analysis compares estimated ground motions for M8 using standard empirical attenuation relationship methods versus full wave propagation results. The UCERF2 also provide probabilities for this event using current best estimates.

The UCERF 2.0 rupture from CyberShake that matches M8 was found using the following guidelines:

1. Use SCEC-VDO SRF Plugin
2. Select CyberShake Ruptures ID:35 (Rupture Set 34 has been deprecated)
3. Select Source that includes the San Andreas Segments included in the M8 fault. We have selected Source ID 89 as the source that includes San Andreas Segments Parkfield,Cholame, CC, BB, NM,SM,NSB,SSB,BG, and C0.
4. Select Rupture Variation Scenario ID: 3. Scenario ID 4 is new as of the SCEC Annual meeteing 2010 and has not been used in any CyberShake calculations
5. Select a rupture variation with a hypocenter location near the M8 hypocenter (-120.396396,35.846868,-16,000)

UCERF2 M8 Rupture Matches:

• 32_3 is a M8.05 and S0055 and H0024 match M8 epicenter and rupture direction.