The Carquinez Bridge geotechnical arrays are operated by the California Strong Motion Instrumentation Program (CSMIP) and recorded a peak ground acceleration (PGA) of approximately 1.0g at ground surface during the 2014 South Napa earthquake. The recorded PGA was significantly larger than those at the nearby surface sites. This study considers surface and downhole recordings from the additional 28 earthquakes recorded at the same arrays to understand the effects of wave propagation and site response at these arrays. Several site response analyses are performed to understand soil nonlinearity using the observed ground accelerations during the 2014 South Napa sequence. Apparent shear wave velocities are calculated from downhole records, which show clear reduction as ground motion intensity increases. Empirical transfer functions (EFTs) are also calculated in which the resonance frequencies became lower during strong shaking during the 2014 South Napa main shock. The in-situ critical damping ratio appears to be frequency dependent in the soft clay deposits. Lower damping at frequencies greater than about 5 Hz may have contributed to the observed PGA at Array #1 during the main shock.
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Research Article|
February 01, 2018
Apparent Wave Velocity and Site Amplification at the California Strong Motion Instrumentation Program Carquinez Bridge Geotechnical Arrays during the 2014 M6.0 South Napa Earthquake
Tadahiro Kishida, M. EERI;
Tadahiro Kishida, M. EERI
a
Khalifa University of Science and Technology, Abu Dhabi, UAE (Formerly: Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA 94720)
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Hamid Haddadi, M. EERI;
Hamid Haddadi, M. EERI
b
California Strong Motion Instrumentation Program, California Geological Survey, Sacramento, CA 95814
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Robert B. Darragh, M. EERI;
Robert B. Darragh, M. EERI
c
Pacific Engineering and Analysis, El Cerrito, CA 94530
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Robert E. Kayen, M. EERI;
Robert E. Kayen, M. EERI
d
U.S. Geological Survey, Menlo Park, CA 94025, and UCLA, Los Angeles, CA 90095
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Walter J. Silva, M. EERI;
Walter J. Silva, M. EERI
c
Pacific Engineering and Analysis, El Cerrito, CA 94530
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Yousef Bozorgnia, M. EERI
Yousef Bozorgnia, M. EERI
e
Department of Civil and Environmental Engineering, University of California, Los Angeles (UCLA)
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Tadahiro Kishida, M. EERI
a
Khalifa University of Science and Technology, Abu Dhabi, UAE (Formerly: Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA 94720)
Hamid Haddadi, M. EERI
b
California Strong Motion Instrumentation Program, California Geological Survey, Sacramento, CA 95814
Robert B. Darragh, M. EERI
c
Pacific Engineering and Analysis, El Cerrito, CA 94530
Robert E. Kayen, M. EERI
d
U.S. Geological Survey, Menlo Park, CA 94025, and UCLA, Los Angeles, CA 90095
Walter J. Silva, M. EERI
c
Pacific Engineering and Analysis, El Cerrito, CA 94530
Yousef Bozorgnia, M. EERI
e
Department of Civil and Environmental Engineering, University of California, Los Angeles (UCLA)
Publisher: Earthquake Engineering Research Institute
Received:
23 Apr 2017
Accepted:
08 Aug 2017
First Online:
01 Jun 2020
Online ISSN: 1944-8201
Print ISSN: 8755-2930
© 2018 Earthquake Engineering Research Institute
Earthquake Engineering Research Institute
Earthquake Spectra (2018) 34 (1): 327–347.
Article history
Received:
23 Apr 2017
Accepted:
08 Aug 2017
First Online:
01 Jun 2020
Citation
Tadahiro Kishida, Hamid Haddadi, Robert B. Darragh, Robert E. Kayen, Walter J. Silva, Yousef Bozorgnia; Apparent Wave Velocity and Site Amplification at the California Strong Motion Instrumentation Program Carquinez Bridge Geotechnical Arrays during the 2014 M6.0 South Napa Earthquake. Earthquake Spectra 2018;; 34 (1): 327–347. doi: https://doi.org/10.1193/042317EQS074M
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Index Terms/Descriptors
- acceleration
- arrays
- attenuation
- body waves
- boreholes
- California
- catalogs
- clastic sediments
- clay
- data bases
- data processing
- earthquakes
- elastic materials
- elastic waves
- frequency
- ground motion
- instruments
- measurement
- Napa County California
- numerical analysis
- P-waves
- peak ground acceleration
- propagation
- S-waves
- sediments
- seismic waves
- seismographs
- soils
- strong motion
- transfer functions
- United States
- velocity
- wave amplification
- site effects
- Napa California
- South Napa earthquake 2014
- Carquinez Bridge
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