Download or read book Holocene Geologic Slip Rate for the Mission Creek Strand of the Southern San Andreas Fault CA written by Rosemarie C. Fryer and published by . This book was released on 2016 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The San Andreas Fault is the primary structure accommodating relative plate motions between the Pacific and North American plates along the southwestern margin of North America. The northern San Andreas Fault (SAF) segment ruptured in 1906 and the central segment releases strain primarily by continuous creep. The south-central Mojave section of SAF ruptured in 1857, but the Coachella Valley section farthest south has not ruptured historically. The Coachella Valley section is therefore considered overdue for an earthquake because it has exceeded its average recurrence interval of ~150-200 years. In the northern Coachella Valley, the Southern SAF (SSAF) splays into three fault strands: the Mission Creek, Banning, and Garnet Hill strands. The NW-striking Mission Creek strand extends from the Indio Hills into the San Bernardino Mountains, whereas the Banning and Garnet Hill strands strike WNW and transfer slip into the San Gorgonio Pass region. Together, the three faults accommodate ~20 mm/yr of right-lateral motion based on geodetic measurements. Determining how slip is partitioned between these faults and how the slip rates have varied over different timescales is critical for southern California seismic hazard models. The purpose of this project was to establish a Holocene geologic slip rate for the Mission Creek strand of the SSAF at the Three Palms slip rate site in the southeast Indio Hills. At the Three Palms Site, located northwest of Biskra Palms, three alluvial fans sourced from three distinct catchments have been offset by the Mission Creek strand. The central portion of these fans is best preserved and records a right lateral displacement of ~57 ± 3 meters. Uranium-series dating of pedogenic carbonate rinds constrain the minimum depositional age of this fan. U-series dates give a standard corrected weighted mean average of 3.49 ± 0.92 ka, yielding a maximum slip rate of 16 +6.1/-3.8 mm/yr. Three samples from an individual clast give a nearly identical isochron age of 3.3 ± 0.6 ka, which provides confidence in the weighted average age. This Holocene maximum slip rate overlaps within error of the previously determined late Pleistocene slip rate measured at Biskra Palms of 12-22 mm/yr, suggesting that the Mission Creek strand slip rate has remained constant over these timescales and that it has remained the dominant fault accommodating slip at the southeast Indio Hills over the past ~50 kyr.
Download or read book Holocene Geologic Slip Rate for the Mission Creek Strand of the Southern San Andreas Fault Indio Hills written by Juan José Muñoz Zapata and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Slip on the southern San Andreas fault in the northwestern Coachella Valley in Southern California is partitioned among three fault strands: the Mission Creek, Garnet Hill, and Banning strands. The NW-striking Mission Creek strand extends from the Indio Hills into the San Bernardino Mountains, whereas the Banning and Garnet Hill strands strike W-NW and transfer slip into the San Gorgonio Pass region. Together, these three faults accommodate ̃ 20 mm/yr of right-lateral motion based on geodetic slip rate estimates. Determining which strand accommodates the majority of fault slip and how slip rates on these strands have varied over Quaternary timescales is critical to seismic hazard assessment for this region. Here I present a new Holocene geologic slip rate estimate from an offset alluvial fan complex along the Mission Creek fault at the Three Palms site in the Indio Hills. The correlation of offset fans precisely located from a satellite image, confirmed by field mapping and B4 LiDAR indicates that the Three Palms fan complex is offset 50.0 ± 5.0 meters. U-series dating on pedogenic carbonate rinds collected at 25-100 cm depth within the deposit constrain the minimum depositional age to 3.49 ± 0.92 ka (95% CI), yielding a maximum slip rate of 19.2 ± 2.0 mm/yr. Cosmogenic 10Be surface exposure dating on boulders yields a scattered dataset with high apparent inheritance and a median age of 13.6 +6.9/-6.7 ka (1[sigma] error). However, the minimum boulder age of 5.4 ± 1.0 ka (2[sigma] error) was interpreted as the maximum depositional age for the fan. This age, along with the preferred offset of 50.0 meters, yields a minimum slip rate of 7.8 ± 0.8 mm/yr. We therefore estimate a Holocene geologic slip rate of 7-21 mm/yr, with a preferred rate of 9-14 mm/yr. This rate overlaps within error with a previously published late Pleistocene slip rate on the Mission Creek strand of 12-22 mm/yr calculated at Biskra Palms Oasis a few kilometers to the southeast.
Download or read book High Geologic Slip Rates Since Early Pleistocene Initiation of the San Jacinto and San Felipe Fault Zones in the San Andreas Fault System Southern California USA written by and published by Geological Society of America. This book was released on 2010-01-01 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The San Jacinto right-lateral strike-slip fault zone is crucial for understanding plate-boundary dynamics, regional slip partitioning, and seismic hazards within the San Andreas fault system of southern California, yet its age of initiation and long-term average slip rate are controversial. This synthesis of prior and new detailed studies in the western Salton Trough documents initiation of structural segments of the San Jacinto fault zone at or slightly before the 1.07 Ma base of the Jaramillo subchron. In Special Paper 475, five new estimates of displacement are developed using offset successions of crystalline rocks; distinctive marker beds in the late Cenozoic basin fill; analysis of strike-slip-related fault-bend folds; quantification of strain in folds at the tips of dextral faults; and gravity, magnetic, and geomorphic data sets."--Publisher's website.
Download or read book The San Andreas Fault System in the Vicinity of the Central Transverse Ranges Province Southern California written by Jonathan C. Matti and published by . This book was released on 1992 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Report on the Late Holocene Slip Rate Along the Central Calaveras Fault Southern San Francisco Bay Area Gilroy California written by and published by . This book was released on 2002 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Slip Rate and Recurrence of Surface faulting Earthquakes on the Northern Calaveras Fault at Leyden Creek Alameda County California written by and published by . This book was released on 1994 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Quaternary Slip Histories and Geochronology Within the Southern San Andreas Fault System written by Peter Owen Gold and published by . This book was released on 2018 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geologic slip histories measure the frequency, rate and magnitude of past displacement along active faults. Projected into the near future, they inform potential seismic hazard over human time scales. In this dissertation I describe the results of four projects focused on developing slip histories for active faults within the complex southern San Andreas Fault plate boundary system in southern California and northern Baja California, Mexico. Slip is accommodated through this densely populated region by multiple concurrently active faults. For the Banning Fault, a primary subsidiary strand of the southern San Andreas Fault, I report the first, and only, constraint on recent geologic slip. The ~4-5 mm/a mid-Holocene slip rate shows that the Banning Fault is less dominant than previously thought, significantly clarifying how slip is partitioned between three primary structures along the section of the San Andreas Fault that is most likely to host the next major earthquake. In northern Baja California, I report the first quantitatively constrained slip history for the Agua Blanca Fault, one of two primary structures transferring dextral plate motion from the Gulf of California rift to faults that parallel the Pacific coast. I report rates from three sites along the Agua Blanca Fault that indicate time-invariant slip of 2.8 +0.8/-0.6 mm/a since ~65.1 ka, 3.0 +1.4/-0.8 mm/a since ~21.8 ka, 3.4 +0.8/-0.6 mm/a since ~11.7 ka, and 3.0 +3.0/-1.5 mm/a since ~1.6 ka. I also report the timing of 7 Holocene earthquakes that suggest maximum earthquake recurrence of ~1000 years, and I report geologic evidence of ~2.5 m of slip in the past two earthquakes, which suggests that the Agua Blanca Fault is capable of accommodating >M7 surface rupturing earthquakes. This new, comprehensive slip history significantly clarifies both on- and off-shore slip partitioning within this part of the Pacific-North American plate boundary. Finally, slip rate and earthquake timing measurements critically depend on geochronologic dating of offset geologic landforms that record past displacement. To evaluate the variability between dates measured using different methods, I report a critical comparison of independent geochronometers that informs best dating practices and demonstrates that discordance often quantifies geomorphic process.
Download or read book Late Holocene Slip Rate for the Mojave San Andreas from Two Sites Near Palmdale California written by Elaine Kathleen Young and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Holocene geologic slip rate on the Mojave San Andreas Fault (MSAF) is not well known, despite its importance for understanding earthquake hazard, the apparent discrepancies between geologic and geodetic slip rates, and the potential long-term fault interactions in southern California. Here I use detailed surficial geologic mapping, excavations, and radiocarbon dating of charcoal to document and date landforms offset by the MSAF at two sites. I use a bracketing approach to define the age of the offset landform, using deposits that pre and post date the formation of the feature. At site X-12, a beheaded channel that formed between 1737 and 547 calBP is offset 48 to 59 m. At the Ranch Center site, a channel that formed between 4288 and 1185 calBP is deflected 72 to 113 m behind a shutter ridge. The overlap between the allowable slip rates from each site yields a late Holocene MSAF geologic slip rate between 27.6 and 59.6 mm/yr.
Download or read book Quaternary Slip Transfer Between the Banning and Mission Creek Faults of the Southern San Andreas Fault Southern California written by Aaron Zachary Salin and published by . This book was released on 2014 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The southern San Andreas fault (sSAF) poses a significant hazard to large population centers, yet is the section of the fault that is least understood. Its lack of historic rupture makes understanding the potential dynamics of a fault rupture key for seismic hazard assessments and preparedness. Recent slip rate data for the Mission Creek strand in the Indio Hills suggests that it is the primary carrier of ruptures through the northern Coachella Valley, but there is a deficit of studies to assess the validity of that claim. This work aims to close that knowledge gap by answering two questions about the Banning and Mission Creek strands of the sSAF: 1) Is there a difference between offsets that provide us information about relative activities, and thus likelihood of rupture, of the two faults? 2) If so, what structures accommodate the transfer of slip from one fault to the other? We address these questions using high-resolution imaging technology (LiDAR DEMs) and a field-based structural analysis of the Indio Hills area. Observations from 41 offset features and a number of non-offset features show decreasing trends in offset for among similar sized drainages on the Mission Creek fault, while offsets along the Banning fault increase away from the Indio Hills. This finding implies that some slip is being transferred through the Indio Hills onto the Banning. We also find a range of structures which have accommodated this slip transfer in the form of transpressive uplift between two faults which merge at depth.
Download or read book High Geologic Slip Rates Since Early Pleistocene Initiation of the San Jacinto and San Felipe Fault Zones in the San Andreas Fault System Southern California USA written by Susanne U. Janecke and published by . This book was released on 2018 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earthquake Geology San Andreas Fault System Palm Springs to Palmdale written by and published by . This book was released on 1992 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evidence of Prehistoric Earthquakes on the Superstition Hills Fault Southern California and a Holocene Slip Rate of the San Andreas Fault at Gorman Creek Southern California written by Scott Charles Lindvall and published by . This book was released on 1988 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Holocene Slip Rate and Amounts of Coseismic Rupture Along the Central Calavaras Fault San Francisco Bay Area California written by Keith Irvin Kelson and published by . This book was released on 1998 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Treatise on Geomorphology written by and published by Academic Press. This book was released on 2013-02-27 with total page 6392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The changing focus and approach of geomorphic research suggests that the time is opportune for a summary of the state of discipline. The number of peer-reviewed papers published in geomorphic journals has grown steadily for more than two decades and, more importantly, the diversity of authors with respect to geographic location and disciplinary background (geography, geology, ecology, civil engineering, computer science, geographic information science, and others) has expanded dramatically. As more good minds are drawn to geomorphology, and the breadth of the peer-reviewed literature grows, an effective summary of contemporary geomorphic knowledge becomes increasingly difficult. The fourteen volumes of this Treatise on Geomorphology will provide an important reference for users from undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic. Information on the historical development of diverse topics within geomorphology provides context for ongoing research; discussion of research strategies, equipment, and field methods, laboratory experiments, and numerical simulations reflect the multiple approaches to understanding Earth’s surfaces; and summaries of outstanding research questions highlight future challenges and suggest productive new avenues for research. Our future ability to adapt to geomorphic changes in the critical zone very much hinges upon how well landform scientists comprehend the dynamics of Earth’s diverse surfaces. This Treatise on Geomorphology provides a useful synthesis of the state of the discipline, as well as highlighting productive research directions, that Educators and students/researchers will find useful. Geomorphology has advanced greatly in the last 10 years to become a very interdisciplinary field. Undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic will find the answers they need in this broad reference work which has been designed and written to accommodate their diverse backgrounds and levels of understanding Editor-in-Chief, Prof. J. F. Shroder of the University of Nebraska at Omaha, is past president of the QG&G section of the Geological Society of America and present Trustee of the GSA Foundation, while being well respected in the geomorphology research community and having won numerous awards in the field. A host of noted international geomorphologists have contributed state-of-the-art chapters to the work. Readers can be guaranteed that every chapter in this extensive work has been critically reviewed for consistency and accuracy by the World expert Volume Editors and by the Editor-in-Chief himself No other reference work exists in the area of Geomorphology that offers the breadth and depth of information contained in this 14-volume masterpiece. From the foundations and history of geomorphology through to geomorphological innovations and computer modelling, and the past and future states of landform science, no "stone" has been left unturned!
Download or read book The San Andreas Fault System written by Robert E. Powell and published by Geological Society of America. This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors of the ten chapters in this volume critically examine the geologic evidence that constrains timing and magnitude of movement on various faults of the San Andreas system, and they develop and discuss paleogeologic reconstructions based on these constraints. The volume offers new insight into the evolution of the San Andreas fault system,
Download or read book Transform Plate Boundaries and Fracture Zones written by Joao C. Duarte and published by Elsevier. This book was released on 2018-09-25 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transform Plate Boundaries and Fracture Zones bridges the gap between the classic plate tectonic theory and new emerging ideas, offering an assessment of the state-of-the-art, pending questions, and future directions in the study of transform plate boundaries and fracture zones. The book includes a number of case studies and reviews on both oceanic and continental tectonic settings. Transform Plate Boundaries and Fracture Zones is a timely reference for a variety of researchers, including geophysicists, seismologists, structural geologists and tectonicists, as well as specialists in exploration geophysics and natural hazards. This book can also be used as an up-to-date reference at universities in both undergraduate and postgraduate levels. Reviews ideas and concepts about transform plate boundaries and fracture zones Includes a variety of case studies on both oceanic and continental settings Addresses innovative and provocative ideas about the activity of fracture zones and transform faults and their impacts to the human society
Download or read book Net Dextral Slip Neogene San Gregorio Hosgri Fault Zone Coastal California written by William R. Dickinson and published by Geological Society of America. This book was released on 2005-01-01 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
