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2014 NAPA Valley EQ

This study details the relocation of the Napa Valley earthquake epicenter to approximately 1.0-1.5 km west of the surface rupture, suggesting an east-dipping fault. The analysis incorporates strong motion data, InSAR analysis, and GPS insights, showing the fault geometry fits the data more accurately than prior models. Notably, seismic inversions identify two asperities, with the later one larger than the former. Static inversion indicates the earlier asperity is bigger, while GPS data highlights a significant slip associated with post-seismic activity.

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2014 NAPA Valley EQ

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  1. 2014 NAPA Valley EQ 2014/09/22

  2. Relocation 68150 is earlier than NHC!

  3. Strong motion, Single fault

  4. Strong motion, two faults

  5. InSAR

  6. Data Downsampled by: Dr. Wang from KAUST

  7. GPS-MIT (Tom Herring)

  8. GPS (JPL)

  9. Data processed by Dr. Fu at JPL

  10. Summary • 1. Epicenter is relocated to about 1.0~1.5km west of the surface rupture, implying a east dipping fault, this fault geometry fits the data better than previous inversions and it is consistent with the InSAR data • 2. Seismic inversions show two asperities with the later asperity larger than the earlier one • 3. Static inversion by InSAR shows two asperities but the earlier one is bigger • 4. GPS inversion only reveals one major asperity about 7 km away from the hypocenter • 5. The large slip in the first asperity in the static inversion might corresponding to fast post-seismic slip, which is shown in the GPS time series

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