Site Characterization Data for Site Response Modeling in Sacramento-San Joaquin Delta Region of California
Publication: Geo-Congress 2023
ABSTRACT
Sites located in the Sacramento-San Joaquin River Delta region of Northern California typically have peaty organic soils near the ground surface. These soils are characteristically soft, with shear wave velocities as low as 30 m/s, and may be present to depths as great as 15 m. These unusually soft geotechnical conditions will produce significant site effects in the event of a strong earthquake, and are not expected to be reliably predicted using existing ergodic site amplification models. This study presents site characterization data related to stratigraphy, shear wave velocity (VS), and microtremor-based horizontal-to-vertical spectral ratio (mHVSR) surveys collected across the delta and archived as part of a project to develop a delta-specific site response model. Spatial variations of time-averaged shear wave velocity 30 m (VS30) across the delta region are mapped and compared to other site parameters. An analysis of 14 sites with HVSR and VS profile data shows examples of sites with and without mHVSR peaks. Sites without peaks also lack layer boundaries with large impedance contrasts within the range of the VS profile. Sites with peaks have such boundaries in some but not all cases.
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REFERENCES
Aagaard, B. T., and Hirakawa, E. T. (2021). San Francisco Bay region 3D seismic velocity model v21.1. US Geological Survey data release, https://doi.org/10.5066/P9TRDCHE.
Bay Delta Live. Last access June 2021. https://www.baydeltalive.com/maps/20803.
Bozorgnia, Y., Abrahamson, N. A., and Al Atik, L. (2014). NGA-West2 research project, Earthquake Spectra, 30, 973–987.
Breiman, L., Friedman, J. H., Olshen, R. A., and Stone, C. J. (1984). Classification and Regression Trees. Wadsworth.
Buckreis, T. E., Winders, A., Wang, P., Brandenberg, S. J., and Stewart, J. P. (2021). Microtremor Data Collected in Sacramento-San Joaquin Delta Region of California. DesignSafe-CI.
Chen, P., and Lee, E. J. (2017). UCVM 17.3.0 Documentation. Retrieved from http://hypocenter.usc.edu.
Darendeli, M. B. (2001). Development of a new family of normalized modulus reduction and material damping curves. Ph.D. Thesis. Dept. of Civil Engineering, Univ. of Texas, Austin, Texas.
Deverel, S., and Leighton, D. (2010). Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA. San Francisco Estuary and Watershed Science. 8.
Drexler, J. Z. (2011). Peat Formation Processes through the Millennia in Tidal Marshes of the Sacramento–San Joaquin Delta, California, USA. Estuaries and Coasts. 34, 900.
DWR (Department of Water Resources). (2013). “2009 Through 2012 Geotechnical Data Report, Pipeline/Tunnel Option.”.
DWR (Department of Water Resources). (2015). “Clifton Court Forebay Dam Embankment Foundation, Three-Dimensional Stratigraphic Model.”.
DWR (Department of Water Resources). (2022). Delta Conveyance and Flood Protection, https://water.ca.gov/Programs/Flood-Management/Delta-Conveyance-And-Flood-Protection.
Kazemian, S., Bujang, H. B. K., Prasad, A., and Maassoumeh, B. (2011). A state of art review of peat: Geotechnical engineering perspective. International Journal of Physical Sciences. 6 (8), 1974–1981.
Kishida, T., Boulanger, R. W., Abrahamson, N. A., Driller, M. W., and Wehling, T. M. (2014). Site effects for the Sacramento-San Joaquin Delta. Earthquake Spectra, 25 (2), 301–322.
Kramer, S. L. (1996). Geotechnical Earthquake Engineering, Prentice Hall, Inc., Upper Saddle River, New Jersey, 653 pp.
Kwak, D. Y., Ahdi, S. K., Wang, P., Zimmaro, P., Brandenberg, S. J., and Stewart, J. P. (2021). Web portal for shear wave velocity and HVSR databases in support of site response research and applications. UCLA Geotechnical Engineering Group.
Menq, F. (2003). Dynamic properties of sandy and gravelly soils. Ph.D. Thesis. Dept. of Civil Engineering, Univ. of Texas, Austin, Texas.
Molnar, S., Cassidy, J. F., and Castellaro, S. (2018). Application of microtremor horizontal-to-vertical spectral ratio (MHVSR) analysis for site characterization: State of the Art, Surv. Geophys. 39, 613–631.
Robertson, P. K. (2016). Cone penetration test (CPT)-based soil behaviour type (SBT) classification system — an update. Canadian Geotechnical Journal. 53 (12), 1910–1927.
Seyhan, E., and Stewart, J. P. (2014). Semi-empirical nonlinear site amplification from NGA-West2 data and simulations. Earthq. Spectra, 30, no. 3, 1241–1256.
Urzúa, A., Dobry, R., and Christian, J. T. (2017). Is Harmonic Averaging of Shear Wave Velocity or the Simplified Rayleigh Method Appropriate to Estimate the Period of a Soil Profile? Earthquake Spectra, 33, 895–915.
Wang, P., Zimmaro, P., Buckreis, T. E., Gospe, T., Brandenberg, S. J., Ahdi, S. K., Yong, A., and Stewart, J. P. (2021). Relational Database for Horizontal-to-Vertical Spectral Ratios, Seismological Research Letters. 93, 1075–1088.
WEF (Water Education Foundation). (2010). C-WIN: Peripheral Canals: Way past, past, and present, https://www.watereducation.org/aquafornia-news/c-win-peripheral-canals-way-past-past-and-present.
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Information
Published In
Geo-Congress 2023
Pages: 187 - 196
History
Published online: Mar 23, 2023
ASCE Technical Topics:
- Continuum mechanics
- Data analysis
- Dynamics (solid mechanics)
- Earthquakes
- Engineering fundamentals
- Engineering mechanics
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Fluid velocity
- Geohazards
- Geomechanics
- Geotechnical engineering
- Geotechnical investigation
- Hydrologic engineering
- Methodology (by type)
- Research methods (by type)
- Seismic waves
- Shear stress
- Shear waves
- Site investigation
- Soil dynamics
- Soil mechanics
- Soil properties
- Solid mechanics
- Stress (by type)
- Structural analysis
- Structural engineering
- Water and water resources
- Wave velocity
- Waves (mechanics)
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