Napa Earthquake - Results

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CISN and Earthquake Engineering Progress

• Napa Earthquake - Results
• Strong shaking in epicentral area, low-level
  shaking throughout Bay area
• Recorded strong motion
• 340 ground response stations
• 70 structures
• 14 geotechnical arrays
• 3000 data channels available from CESMD,
  StrongMotionCenter.org

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PGA vs Rjb Distance

• BA08 (Boore-Atkinson, 2008
• Strike-slip
• Vs30 760 m/s

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• Geotechnical Downhole Arrays
• Records from 14 arrays (Caltrans supported)
• Two arrays with strong shaking

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Surface 67 ft 150 ft
E-W
N-S
Vert
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(Tilt Sensor)
(Pile Tip Sensors)
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North End
South End
Tilt
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South Napa Earthquake of 2014

• First strong shaking in Bay area since Loma
  Prieta, 1989
• Many more sites and structure instrumented now
• All major toll bridges (Caltrans supported)
• 15 high rise buildings
• Many ground stations (both CGS and USGS), CISN
  stations
• Significant new data
• 400 strong motion records vs 200
• Brought together in StrongMotionCenter.org