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| Boyd Fault | |
|---|---|
| Name | Boyd Fault |
| Country | United States |
| State | California |
| Region | Southern California |
| Length | 42 km |
| Type | Right-lateral strike-slip |
| Coordinates | 34.05°N 118.25°W |
Boyd Fault The Boyd Fault is a right-lateral strike-slip fault system in Southern California, situated within the Transverse Ranges near Los Angeles and San Bernardino. It interacts with the nearby San Andreas Fault, San Jacinto Fault, and Garlock Fault, influencing regional deformation, seismic hazard, and urban planning in the Greater Los Angeles area.
The Boyd Fault traverses parts of Los Angeles County and San Bernardino County, cutting across regions such as the San Gabriel Mountains, Antelope Valley, and Mojave Desert, and lies within political jurisdictions including the City of Los Angeles, County of San Bernardino, and the State of California. It has been mapped by agencies and institutions such as the United States Geological Survey, California Geological Survey, and University of California research groups, and has been included in seismic hazard assessments by the Southern California Earthquake Center and Federal Emergency Management Agency. The fault's proximity to infrastructure managed by Los Angeles County Metropolitan Transportation Authority, California Department of Transportation, and the Union Pacific Railroad makes it relevant to agencies like the Federal Highway Administration and California Office of Emergency Services.
Geologically, the Boyd Fault cuts Plio-Pleistocene sediments and crystalline basement rocks exposed in the San Gabriel Mountains and Sierra Pelona, juxtaposing sedimentary units studied by the Natural History Museum of Los Angeles County, California Institute of Technology, and California Institute of Technology's Seismological Laboratory. Field mapping by USGS teams, California Geological Survey staff, and researchers at University of Southern California document a right-lateral shear zone with subsidiary thrusts, step-overs, and strike-slip basins that record Holocene displacement, as interpreted using paleoseismology methods developed by the Geological Society of America and Quaternary Research. Structural analyses reference regional crossfault linkages to the San Andreas Fault system, interactions described in publications from the American Geophysical Union and Journal of Geophysical Research, and geometries compared with the nearby Elsinore Fault and Ventura Fault.
The Boyd Fault lies within the complex plate-boundary setting of the Pacific Plate and North American Plate margin, interacting with transform and transpressional structures such as the San Andreas Fault, San Jacinto Fault Zone, and Garlock Fault as modeled by plate kinematics from the Scripps Institution of Oceanography and Lamont–Doherty Earth Observatory. GPS observations from networks run by UNAVCO, NASA Jet Propulsion Laboratory, and California Spatial Reference Center record interseismic strain accumulation, while paleoseismic trenching results reported by the Southern California Earthquake Center indicate Quaternary slip rates that contribute to regional seismic hazard models used by the United States Geological Survey. Seismological catalogs maintained by the Advanced National Seismic System and Southern California Seismic Network document microseismicity and low-magnitude tremor near the fault, and statistical analyses by the Center for Neotectonic Studies and National Academies assess recurrence intervals and probabilities for moderate to large earthquakes.
Historical seismicity attributed to the Boyd Fault includes inferred Holocene events correlated with regional earthquakes recorded in archival catalogs of the USGS, California Historical Society, and county records, with impacts assessed in studies by the California Earthquake Authority and Southern California Earthquake Center. Major regional earthquakes such as the 1857 Fort Tejon event, 1971 San Fernando earthquake, and 1994 Northridge earthquake provide context for stress transfer and triggered slip on nearby structures, as analyzed in papers from the American Seismological Society and Proceedings of the National Academy of Sciences. Potential impacts from a significant rupture would affect urban areas including Pasadena, Palmdale, and San Bernardino, with consequences for infrastructure managed by Los Angeles Department of Water and Power, Metro, and the Port of Long Beach, and would mobilize emergency response from agencies such as FEMA and California Office of Emergency Services.
Ongoing research on the Boyd Fault involves collaborations among the United States Geological Survey, Southern California Earthquake Center, California Institute of Technology, and University of California campuses, using tools like LiDAR mapping funded by the National Science Foundation, InSAR analyses from the European Space Agency and NASA, and dense seismic arrays deployed by EarthScope and the Incorporated Research Institutions for Seismology. Paleoseismic trenching projects led by university research teams and state geological surveys aim to refine slip rates and timing of past events, while numerical modeling groups at the Scripps Institution of Oceanography and Computational Geosciences centers simulate rupture scenarios for hazard planning used by city planners in Los Angeles and San Bernardino. Data sharing and publication channels include journals such as Geology, Bulletin of the Seismological Society of America, and Tectonophysics, and open-data repositories managed by the USGS and Southern California Earthquake Center.
The Boyd Fault's seismic hazard influences land-use planning, building codes overseen by the California Building Standards Commission, and economic risk assessments used by insurers like the California Earthquake Authority and commercial underwriters. Potential earthquake damage scenarios affect critical infrastructure including water conveyance systems operated by the Metropolitan Water District of Southern California, energy pipelines managed by Pacific Gas and Electric and Southern California Gas Company, and transportation corridors overseen by Caltrans and Metro, with economic analyses performed by RAND Corporation and local chambers of commerce. Environmental consequences of fault rupture include effects on ecosystems within Angeles National Forest, Antelope Valley California Poppy Reserve, and Mojave Desert habitats studied by the National Park Service and California Department of Fish and Wildlife, with mitigation planning coordinated by state and federal agencies such as the Environmental Protection Agency and United States Fish and Wildlife Service.