Napa Earthquake - Results Strong shaking in epicentral area, low-level shaking throughout Bay area
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Transcript of Napa Earthquake - Results Strong shaking in epicentral area, low-level shaking throughout Bay area
• 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
CISN and Earthquake Engineering Progress
PGA vs Rjb Distance
• BA08 (Boore-Atkinson, 2008
• Strike-slip• Vs30 = 760
m/s
Geotechnical Downhole Arrays• Records from 14 arrays (Caltrans
supported)• Two arrays with strong shaking
Surface
67 ft
150 ft
E-W
N-S
Vert
(Pile Tip Sensors)
(Tilt Sensor)
North End
South End
Tilt
• 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
South Napa Earthquake of 2014