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Assessing The Rose Canyon Fault Zone Architecture Downtown San Diego California
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Book Synopsis Assessing the Rose Canyon Fault Zone Architecture, Downtown San Diego, California by :
Download or read book Assessing the Rose Canyon Fault Zone Architecture, Downtown San Diego, California written by and published by . This book was released on 2017 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The City of San Diego is traversed by the Holocene?active Rose Canyon Fault Zone (RCFZ). The RCFZ is a right lateral strike?slip fault with a slip rate of 1-2 mm/yr and the potential to produce a M6.9 earthquake. This project focuses on strands of the RCFZ that traverse through downtown San Diego. The RCFZ seismic hazard has a direct impact on city development via the Alquist?Priolo Earthquake Fault Zoning Act, which regulates structures for human occupancy based on seismic assessments. As a result, geotechnical firms have been conducting many private, small?scale studies of local fault architecture since the 1980s and have amassed an impressive amount of data. However, each report is site specific with minimal integration between neighboring sites. There exists no resource where all the data can be studied simultaneously. This project synthesizes existing geotechnical data into an interactive geodatabase to elucidate RCFZ geometry and the evolution of the fault zone through downtown San Diego. The geodatabase contains geologic and geotechnical data that have been digitized from 268 reports. Using the data, fault segments were characterized as active, potentially active, or less potentially active. The results show an active zone of discontinuous fault segments trending N-S in eastern downtown. Both active and less potentially active faults are found mostly to the east, while potentially active faults are found throughout downtown. Furthermore, the research area is located at the edge of the San Diego Bay pull-apart basin, where the RCFZ steps offshore to the Descanso fault. Few field studies have examined the character of bounding faults as they approach releasing step-overs, which could have control on earthquake rupture dynamics. To identify patterns between fault strike and fault activity on the RCFZ, fault strike of each segment was determined and plotted on rose diagrams. These results showed active faults and less potentially active faults to have similar strike orientations, with mean directions of N12°W and N17°W, respectively, while potentially active faults plotted with a mean direction of N17°E. These results may indicate a change in stress orientation through time, or a change related to step-over evolution.
Book Synopsis The Rose Canyon Fault Zone by : Monte L. Murbach
Download or read book The Rose Canyon Fault Zone written by Monte L. Murbach and published by . This book was released on 2000 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Seismic Risk in the San Diego Region by : Glenn Roquemore
Download or read book The Seismic Risk in the San Diego Region written by Glenn Roquemore and published by DIANE Publishing. This book was released on 1997-04 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: The San Diego region had enjoyed a long period of seismic quiescence since the last damaging earthquake in 1862. This quiescence was broken in 1984 with several earthquake swarms in San Diego Bay. Because of the lack of consensus among geoscientists about future earthquake threats, a workshop was conducted that: brought together all interested geoscientists; brought together all available data for debate and discussion; evaluated the data; and identified data gaps and recommended a collective approach. Includes charts, graphs, and drawings. Extensive references.
Book Synopsis The Rose Canyon Fault Zone, Southern California by : Jerome A Treiman
Download or read book The Rose Canyon Fault Zone, Southern California written by Jerome A Treiman and published by . This book was released on 1993 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Trenching the Rose Canyon Fault Zone, San Diego, California by : Ernest R. Artim
Download or read book Trenching the Rose Canyon Fault Zone, San Diego, California written by Ernest R. Artim and published by . This book was released on 1981 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Critical Examination and Evaluation of the Structue and Stratigraphy in the Downtown San Diego Area, California by : Dorian Lizabeth Elder
Download or read book A Critical Examination and Evaluation of the Structue and Stratigraphy in the Downtown San Diego Area, California written by Dorian Lizabeth Elder and published by . This book was released on 1982 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings, Workshop on "the Seismic Risk in the San Diego Region: Special Focus on the Rose Canyon Fault System" by :
Download or read book Proceedings, Workshop on "the Seismic Risk in the San Diego Region: Special Focus on the Rose Canyon Fault System" written by and published by . This book was released on 1989 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Slip Rate and Paleoseismicity of the Rose Canyon Fault Zone, San Diego, California by : Scott C. Lindvall
Download or read book Determination of Slip Rate and Paleoseismicity of the Rose Canyon Fault Zone, San Diego, California written by Scott C. Lindvall and published by . This book was released on 1993 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environment Southwest written by and published by . This book was released on 1988 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geodetic Measurements for Urban Earthquake Hazard in San Diego, California by : Duncan Carr Agnew
Download or read book Geodetic Measurements for Urban Earthquake Hazard in San Diego, California written by Duncan Carr Agnew and published by . This book was released on 2007 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fault Zone Architecture of the San Jacinto Fault Zone in Horse Canyon, Southern California by :
Download or read book Fault Zone Architecture of the San Jacinto Fault Zone in Horse Canyon, Southern California written by and published by . This book was released on 2010 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stream cuts in Horse Canyon southwest of Anza, California have exposed the fault core, adjacent damage zone, and wall rocks of the San Jacinto fault at an approximate depth of 0.4 km. Here the juxtaposition of tonalitic plutons provides a unique opportunity to assess the formation of fault zone rocks with similar host-rock lithologies. We present results on the physical properties, chemistry and mineralogy of distinct zones identified within the fault zone. Samples from these zones were analyzed using bulk and grain density measurements, geochemical data, clay mineralogy, and textural and modal mineralogy. Progressive mechanical deformation is characterized by initial mode I cracking in quartz and plagioclase and subsequent shearing of fractured rock. These processes produce anastomosing seams of microbreccia and gouge that increase in frequency, thickness, and degree of grain communition towards a strongly indurated cataclasite fault core. Damage progression towards the fault core is accompanied by decreased bulk and grain density and increased porosity and dilational volumetric strain. A-CN-K plots indicate that fault zone rocks are altered along a trend from unweathered tonalitic wall rocks towards an end member that includes illite-mica. Such a trend is different from that expected from normal surface weathering. Chemical alteration along this trend is reflected in elemental mass changes that are most pronounced in the fault core where dissolution of plagioclase has resulted in a core that is highly enriched in quartz. Moreover, the illite/smectite to illite conversion is preserved in the cataclasite core, suggesting elevated temperatures that may have approached ~150°C. The above relationships are consistent with higher water /rock ratios within the fault core than in the surrounding damage zones of gouge and microbreccia. These results, in conjunction with published data on the permeability behavior of cataclasite during deformation events, indicate that hot pore fluids likely circulate upward via a narrow conduit within the San Jacinto fault zone during and after dynamic shearing episodes. Given the ~0.4 km maximum depth of rocks studied in this investigation, such fluids must have reached very shallow levels. Though difficult to constrain, the site studied during this investigation may represent the top of a series of narrow hydrothermal circulation cells that dissipate heat generated from rupture events at deeper levels (> 4 km).
Book Synopsis Character and Recency of Faulting, San Diego Metropolitan Area, California by : California. Division of Mines and Geology
Download or read book Character and Recency of Faulting, San Diego Metropolitan Area, California written by California. Division of Mines and Geology and published by . This book was released on 1975 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Earth Science for Civil and Environmental Engineers by : Richard E. Jackson
Download or read book Earth Science for Civil and Environmental Engineers written by Richard E. Jackson and published by Cambridge University Press. This book was released on 2019-01-24 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces the fundamental principles of applied Earth science needed for engineering practice, with case studies, exercises, and online solutions.
Book Synopsis Neotectonics in San Diego, California by : Drake M. Singleton
Download or read book Neotectonics in San Diego, California written by Drake M. Singleton and published by . This book was released on 2020 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Newport-Inglewood-Rose Canyon (NIRC) fault system is a major structural boundary that extends along coastal southern California from Los Angeles to San Diego. The material presented in this thesis provides new data that resolve uncertainties in fault behavior for the southern segment, the Rose Canyon fault (RCF). Stratigraphic evidence from newly opened paleoseismic trenches are used to interpret six surface-rupturing earthquakes on the RCF in the past 3,300 years. Paleoearthquake ages constrained by radiocarbon dating suggest a late-Holocene recurrence interval of ~700 years, with the most recent large-magnitude event occurring in the mid-1700s. When combined with previous paleoseismic studies, the new paleoearthquake ages show an apparent temporal correlation of earthquake occurrence between the southern and northern segments of the NIRC fault system, suggesting a possible northward-cascading sequence of earthquakes. The RCF includes a significant onshore segment, which provides an opportunity to use traditional geodetic techniques to resolve slip rate. Surface velocities from a combined campaign and continuous GPS network that spans the RCF are used to constrain elastic half-space models. The best-fitting model suggests a rate that is toward the higher end of geologic estimates, as well as a potential rheological contrast across the fault trace. The GPS surface velocities further suggest a more easterly trace for the RCF, and a possible connection with the San Miguel--Vallecitos fault system. South of downtown San Diego, the RCF splays out into a complex network of faults that accommodate the subsidence beneath San Diego Bay. Using legacy multi-channel seismic data and recently collected high-resolution chirp profiles, the fault structure and stratigraphic character beneath San Diego Bay is examined. Gridded surface horizons and fault maps show widespread down-to-the-east displacement. Fault orientations in the western portion of the San Diego Bay pull-apart basin are well described by a Rose Canyon-Descanso pull-apart basin, but faults in the eastern portion of the basin lie outside of this model and exhibit the wrong sense of displacement. A separate but related Rose Canyon-San Miguel-Vallecitos pull-apart basin may explain the faulting seen in the eastern portion of the basin.
Book Synopsis Architecture and Segmentation of Strike-Slip Faults in Southern California by : Valerie Jean Sahakian
Download or read book Architecture and Segmentation of Strike-Slip Faults in Southern California written by Valerie Jean Sahakian and published by . This book was released on 2015 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the architecture and segmentation of fault structures in Southern California, using marine active-source seismic data. Onshore or marine fault geometry is often poorly constrained due to their location. This study employs marine active-source seismic data to image these structures, and further the current understanding of the hazards they pose to the region. With these data, this dissertation first improves the existing framework of knowledge of fault architecture in the Salton pull-apart basin, near the terminus of the Southern San Andreas Fault (SSAF). It investigates the evolution of the pull-apart basin in the Imperial-San Andreas fault system with reflection and refraction data, and provides important constraints regarding the interplay of faults and strain partitioning in this region. New data suggest the existence of a previously unknown fault in the Salton Sea, the Salton Trough Fault (STF). This transtensional fault is located just to the west of the eastern Salton Sea shoreline, and strikes approximately parallel to the SSAF terminus. Finally, this dissertation investigates the architecture and segmentation of the Newport-Inglewood/Rose Canyon (NIRC) fault zone oshore Southern California, using seismic data sets with unprecedented density and resolution. It identifies four main fault strands, with three main stepover boundaries, and presents possible rupture scenarios based on quantitative and qualitative assessments of throughgoing rupture at stepovers or segment boundaries.
Book Synopsis Journal of Research of the U.S. Geological Survey by : Geological Survey (U.S.)
Download or read book Journal of Research of the U.S. Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1974 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific notes and summaries of investigations in geology, hydrology, and related fields.
Book Synopsis Geology of the San Francisco Bay Region by : Doris Sloan
Download or read book Geology of the San Francisco Bay Region written by Doris Sloan and published by Univ of California Press. This book was released on 2006-06-27 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: "You can't really know the place where you live until you know the shapes and origins of the land around you. To feel truly at home in the Bay Area, read Doris Sloan's intriguing stories of this region's spectacular, quirky landscapes."—Hal Gilliam, author of Weather of the San Francisco Bay Region "This is a fascinating look at some of the world's most complex and engaging geology. I highly recommend this book to anyone interested in an understanding of the beautiful landscape and dynamic geology of the Bay Area."—Mel Erskine, geological consultant "This accessible summary of San Francisco Bay Area geology is particularly timely. We are living in an age where we must deal with our impact on our environment and the impact of the environment on us. Earthquake hazards, and to a lesser extent landslide hazards, are well known, but the public also needs to be aware of other important engineering and environmental impacts and geologic resources. This book will allow Bay Area residents to make more intelligent decisions about the geological issues affecting their lives."—John Wakabayashi, geological consultant
