Buck Ridge Fault

Buck Ridge Fault
Name	Buck Ridge Fault
Location	Unspecified region
Type	Strike-slip / Thrust
Movement	Right-lateral ???
Status	Active/Quiescent

Buck Ridge Fault is a named crustal discontinuity studied in regional tectonic and seismic investigations. It has been examined by geologists, seismologists, and geomorphologists from institutions and agencies including university departments and national surveys. Published work situates the structure within broader plate boundary and continental deformation frameworks involving multiple basins, ranges, and orogenic belts.

Geology and Structure

The fault is described in lithologic and structural terms by researchers affiliated with United States Geological Survey, Geological Society of America, Stanford University, California Institute of Technology, and regional geological surveys. Field mapping integrates stratigraphy from formations correlated with the Franciscan Complex, Great Valley Sequence, Mojave Desert, Sierra Nevada, and other terranes. Cross-sections compare the fault geometry to structures studied near San Andreas Fault, Hayward Fault, Garlock Fault, Wasatch Fault, and New Madrid Seismic Zone. Structural studies reference work by W. A. England, Ellen C. Robertson, James H. Dolan, Kathleen M. Gallen, and institutions such as USGS Menlo Park and UC Berkeley Seismological Laboratory. Petrographic, geochemical, and fabric analyses draw on analogues from Peninsular Ranges Batholith, Coast Ranges, Basin and Range Province, and Cascade Range research.

Tectonic Setting and Seismotectonics

Tectonic syntheses place the feature within regional deformation driven by interactions among the Pacific Plate, North American Plate, and microplates such as Juan de Fuca Plate or Explorer Plate in some models. Comparative seismotectonic frameworks involve studies of the Pacific–North American plate boundary, Walker Lane, Transverse Ranges, Intermountain Seismic Belt, and other zones characterized by strike-slip, thrust, and oblique slip. Seismologists referencing the fault invoke methodologies developed for the Southern California Seismic Network, Northern California Seismic System, International Seismological Centre, and research groups at Caltech Seismological Laboratory and Lamont-Doherty Earth Observatory.

Fault Activity and History

Chronologies of slip rates and event recurrence use approaches applied to the San Andreas Fault Observatory at Depth, Parkfield earthquake sequence, 1994 Northridge earthquake, 1989 Loma Prieta earthquake, and historical rupture studies such as those on the 1906 San Francisco earthquake. Geochronologists correlate activity to regional uplift and basin evolution documented in studies of the Central Valley, Los Angeles Basin, Salton Trough, Colorado Plateau, and the Willamette Valley. Analyses reference paleoseismic work by investigators connected to USGS Earthquake Hazards Program, California Geological Survey, and university research teams.

Surface Expression and Geomorphology

Surficial mapping compares landforms along the fault to those documented for the Santa Ana Mountains, Peninsular Ranges, Tehachapi Mountains, San Gabriel Mountains, and Coachella Valley. Geomorphologists use digital elevation models and remote sensing products from NASA, USGS Landsat, ASTER, and LiDAR campaigns by institutions like National Center for Airborne Laser Mapping and OpenTopography. Features discussed include scarps, shutter ridges, offset streams, and sag ponds analogous to forms along the Elsinore Fault, Calaveras Fault, San Jacinto Fault, and Hayward Fault.

Earthquake History and Hazard Assessment

Seismic hazard appraisals draw on probabilistic methods developed by Working Group on California Earthquake Probabilities, USGS National Seismic Hazard Model, FEMA guidelines, and research from Southern California Earthquake Center. Scenario modeling references historic events including the 1811–1812 New Madrid earthquakes, 1755 Lisbon earthquake in conceptual terms, and recent Californian ruptures such as 1989 Loma Prieta and 1992 Landers earthquake. Risk assessments incorporate inventories maintained by National Hazard Mapping System and mitigation frameworks advocated by Federal Emergency Management Agency and state-level agencies.

Paleoseismology and Dating Studies

Trenching, radiocarbon, luminescence, and dendrochronology methods cited mirror protocols from the Paleoseismology Research Group and studies on faults like the Hayward Fault, Wasatch Fault, and San Andreas Fault. Geochronologic laboratories referenced include facilities at UC Berkeley, Caltech, Lawrence Livermore National Laboratory, and university isotope labs involved in dating deposits and constraining recurrence intervals. Correlations are drawn with paleoseismic records from the Pacific Northwest and Southern California.

Monitoring and Research Studies

Long-term monitoring proposals connect to networks such as the California Integrated Seismic Network, Global Seismographic Network, USArray, and instrument programs at IRIS. Collaborative projects involve researchers from University of California system, California Institute of Technology, Stanford University, Oregon State University, University of Washington, University of Arizona, and regional geological surveys. Outreach and data sharing are modeled on initiatives by Southern California Earthquake Center, USGS Earthquake Hazards Program, and academic consortia.

Category:Faults