San Andreas Fault Displacement Hazard Characterization of the Los Angeles Aqueduct at the Elizabeth Tunnel
Publication: Lifelines 2022
ABSTRACT
The Los Angeles Aqueduct provides critical supply for the Los Angeles Department of Water and Power conveyance system by transporting water from Owens Valley to the northern San Fernando Valley. The aqueduct’s crossing of the San Andreas fault (SAF) at Elizabeth Tunnel represents a major engineering challenge to risk mitigation. Future SAF ruptures have the potential to completely sever the 2.9-m-wide tunnel and disrupt its operation. Fault characterization and displacement hazard studies were performed to support development of design concepts. Following extensive field investigations, an integrated geological model was developed characterizing the SAF locally as a steeply south-dipping zone of faults that narrows and coalesces from the surface to tunnel depth. Large, calculated displacement hazard values developed in accordance with the design guidelines were compared with average and maximum surface displacements from a global data set of large, continental strike-slip earthquakes to develop final recommendations of fault displacement hazard at the tunnel crossing. Characterization of the fault zone and displacement hazard are being used to develop design alternatives to improve LADWP water supply resilience.
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REFERENCES
Amec Foster Wheeler. (2019). San Andreas Fault Characterization (Phase 2), LADWP Elizabeth Tunnel, Los Angeles County, California. https://osf.io/2vn6x/.
Barrows, A. G., Kahle, J. E., and Beeby, D. J. (1985). Earthquake hazards and tectonic history of the San Andreas Fault Zone, Los Angeles County, California.
Chester, F. M., Friedman, M., and Logan, J. M. (1985). “Foliated cataclasites.” Tectonophysics, 111: 139–146.
City of Los Angeles. (2014). Resilience by Design., 123 p.
Davis, C. A. (2019). Performance Based Seismic Design for LADWP Water System, Version 1.0, 74 p.
Darby, D. J., and Beanland, S. (1992). “Possible source models for the 1855 Wairarapa earthquake, New Zealand.” Jour. Geophys. Res.: Solid Earth, 97 (B9):12375–12389.
Dawson, T. E., and Weldon, R. J., II (2013). “Appendix B–Geologic slip-rate data and geologic deformation model” in Uniform California earthquake rupture forecast, Version 3 (UCERF3)—The time-independent model.
Field, E. H., Biasi, G. P., Bird, P., Dawson, T. E., Felzer, K. R., Jackson, D. D., Johnson, K. M., Jordan, T. H., Madden, C., Michael, A. J., Milner, K. R., Page, M. T., Parsons, T., Powers, P. M., Shaw, B. E., Thatcher, W. R., Weldon, R. J., II, and Zeng, Y. (2013). Uniform California earthquake rupture forecast, Version 3 (UCERF3)—The time-independent model.
GSC (GeoSoils Consultants, Inc.). (2001). Supplemental Geologic and Geotechnical Engineering Investigation, Proposed Recreational Facility, 17000 Elizabeth Lake Road, County of Los Angeles, California.
Gold, R. D., Reitman, N. G., Briggs, R. W., Barnhart, W. D., Hayes, G. P., and Wilson, E. (2015). “On-and off-fault deformation associated with the September 2013 Mw 7.7 Balochistan earthquake: Implications for geologic slip rate measurements.” Tectonophysics, 660, 65–78.
Hecker, S., Abrahamson, N. A., and Wooddell, K. E. (2013). “Variability of displacement at a point: implications for earthquake-size distribution and rupture hazard on faults.” Bull. Seism. Soc. Am., 103, 651–674.
Hernandez, J. L. (2011). Preliminary Geologic Map of the Lake Hughes 7.5-Minute quadrangle, Los Angeles County, California. California Geological Survey, scale 1:24,000.
LCI (Lettis Consultants International, Inc.). (2016). Geologic Characterization of Elizabeth Tunnel Alignment (Phase 1), LADWP Los Angeles Aqueduct System, Los Angeles County, California.
LCI (Lettis Consultants International, Inc.). (2019). Integration of Phase 1/Phase 2 Investigations and Fault Displacement Hazard Estimates for Elizabeth Tunnel Crossing of the San Andreas Fault, Appendix A in Amec Foster Wheeler. (2019). San Andreas Fault Characterization (Phase 2), LADWP Elizabeth Tunnel, Los Angeles County, California. LADWP Document No. AX-00718-2, April 2019, with appendices. https://osf.io/2vn6x/.
Rodgers, D. W., and Little, T. A. (2006). “World’s largest coseismic strike‐slip offset: The 1855 rupture of the Wairarapa fault, New Zealand, and implications for displacement/length scaling of continental earthquakes.” Jour. Geophys. Res., 111 (B12).
Scharer, K., Weldon, R., Biasi, G., Streig, A., and Fumal, T. (2017). “Ground‐rupturing earthquakes on the northern Big Bend of the San Andreas fault, California, 800 AD to present.” Jour. Geophys. Res., 122(3), 2193–2218.
Sibson, R. H. (1977). “Fault rocks and fault mechanisms.” Jour. Geol. Soc., 133(3), 191–213.
Sieh, K. (1978). “Slip along the San Andreas fault associated with the great 1857 earthquake.” Bull. Seism. Soc. Am., 68, 1421–1428.
Wells, D. L., and Coppersmith, K. J. (1994). “New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement.” Bull. Seism. Soc. Am., 75, 939–964.
Zielke, O., Arrowsmith, J. R., Ludwig, L. G., and Akciz, S. O. (2012). “High‐resolution topography‐derived offsets along the 1857 Fort Tejon earthquake rupture trace, San Andreas fault.” Bull. Seism. Soc. Am., 102, 1135–1154.
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Lifelines 2022
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Published online: Nov 16, 2022
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