Download or read book Temporal Variations in Slip rate Along the Lone Mountain Fault Western Nevada written by Jeffrey Simon Hoeft and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Late Pleistocene displacement along the Lone Mountain fault suggests the Silver Peak-Lone Mountain (SPLM) extensional complex is an important structure in accommodating and transferring strain within the eastern California shear zone (ECSZ) and Walker Lane. Using geologic and geomorphic mapping, differential global positioning system surveys, and terrestrial cosmogenic nuclide (TCN) geochronology, we determined rates of extension across the Lone Mountain fault in western Nevada. The Lone Mountain fault is the northeastern component of the SPLM extensional complex, and is characterized by a series of down-to-the-northwest normal faults that offset the northwestern Lone Mountain and Weepah Hills piedmonts. We mapped eight distinct alluvial fan deposits and dated three of the surfaces using ℗£1́ʻBE TCN geochronology, yielding ages of 16.5 +/- 1.2 ka, 92.3 +/- 8.6 ka, and 142.2 +/- 19.5 ka for the Q3b, Q2c, and Q2b deposits, respectively. The ages were combined with scarp profile measurements across the displaced fans to obtain minimum rates of extension; the Q2b and Q2c surfaces yield an extension rate between 0.1 +/- 0.1 and 0.2 +/- 01 mm/yr and the Q3b surface yields a rate of 0.2 +/-.1 to 0.4 +/- 0.1 mm/yr, depending on the dip of the fault. Active extension on the Lone Mountain fault suggests that it helps partition strain off of the major strike-slip faults in the northern ECSZ and transfers deformation around the Mina Deflection northward into the Walker Lane. Combining our results with estimates from other faults accommodating dextral shear in the northern ECSZ reveals an apparent discrepancy between short- and long-term rates of strain accumulation and release. If strain rates have remained constant since the late Pleistocene, this could reflect transient strain accumulation, similar to the Mojave segment of the ECSZ. However, our data also suggest an increase in strain rates between ~92 ka and ~17 ka, and possibly to present day, which may also help explain the mismatch between long- and short-term rates of deformation in the region.
Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1988 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Bulletin written by and published by . This book was released on 1983 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geologic Excursions from Fresno California and the Central Valley A Tour of California s Iconic Geology written by Keith Daniel Putirka and published by Geological Society of America. This book was released on 2013 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume presents field guides that span the breadth of central California's geology. The trips are associated with the 2013 GSA Cordilleran Section meeting, convened in Fresno, California, 18-25 May. The guides are to geologic localities that are not only iconic, but are also type examples of key geologic phenomena"--Provided by publisher.
Download or read book New Publications of the U S Geological Survey written by and published by . This book was released on 1985 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Guide to Plutons Volcanoes Faults Reefs Dinosaurs and Possible Glaciation in Selected Areas of Arizona California and Nevada written by Ernest M. Duebendorfer and published by Geological Society of America. This book was released on 2008-01-01 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers from the 2008 combined Cordilleran and Rocky Mountain Sections meeting of the Geological Society of America provide background information and road logs for 11 field trips in Nevada, Arizona, and California. Field trips span the geological record from the Ediacaaran (late Neoproterrozoic) to the Holocene. The field trips highlight features of tectonics, paleontology, volcanism, and glaciation. B&w and color photos and maps are included. There is no subject index. Duebendorfer is affiliated with Northern Arizona University. Smith is affiliated with the University of Nevada-Las Vegas.
Download or read book Spatial and Temporal Slip rate Variations on the San Andreas Fault Inferred from Geodetic Data and the Implications for Strain Accumulation written by Jessica Ruth Murray and published by . This book was released on 2003 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Bulletin written by Gilpin R. Robinson (Jr.) and published by . This book was released on 1992 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multidisciplinary study of the geomorphic effects of a severe storm in a mountainous area of the Appalachians.
Download or read book Earthquake Notes written by Seismological Society of America. Eastern Section and published by . This book was released on 1984 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: No. 1/2 of each vol., 1930- form the Proceedings or abstracts of proceedings of the section's annual meetings, some of which were held jointly with the Section of Seismology of the American Geophysical Union. No. for 1953-62 include Minutes of the Eastern Section meetings 25th-34th.
Download or read book The Owens Valley Fault Zone Eastern California and Surface Faulting Associated with the 1872 Earthquake written by Sarah Beanland and published by . This book was released on 1994 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimates of slip and magnitude of the 1872 Owens Valley earthquake and estimates of late Quaternary slip, slip rate, and earthquake recurrence associated with the 100-km-long fault zone as determined at 40 sites.
Download or read book Regional Geology Gold Deposits of the Silver Peak Area written by and published by . This book was released on 2003 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exploration of the Holocene Record of Fault Slip for the Mojave Section of the San Andreas Fault written by Teresa Compton O'Banion and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measuring histories of fault slip spanning multiple (10-100) ruptures has the potential to advance understanding of fault and fault-system behavior, including temporal variations in the rate of strain release. The Mojave section of the San Andreas fault (MSAF) shows an apparent discrepancy between slip rates where reported geodetic rates are systematically slower relative to geologic rates. Resolving this discrepancy is important for determining whether or not the MSAF exhibits temporal changes in slip. Paleoseismic data along the MSAF suggest temporal variations in strain release over the last 2 ka, but more studies are needed to extend the slip history back in time. Here we address the problem of the apparent slip rate discrepancy and possible temporal variations in strain release by employing Monte Carlo analysis of previously reported displacement-time data to investigate the extent to which these data constrain the Holocene slip history. We evaluated 42 previously reported piercing lines for possible inclusion in our analysis, 15 of which were unused because they are either duplicate reports or poorly documented. The remaining 27 data points reveal that slip rates are nonexistent for five offset distances (19-27m, 33-42m, 45-63m, 65-129m, and 131-300m) and for three time periods from 10-3.9 ka, 3.9-2.8 ka, and 2.8-1.4 ka. Results of this analysis suggest slip rate along the MSAF varied between 0 and 4.5 ka, with five possible phases of strain release, 3 of which are faster than the average of ~30 mm yr−1. The oldest fast phase was from 4.5-2.9 ka with an average slip rate of 61 506/40 mm yr−1. The next fast phase, with an average rate of 81 54/3 mm yr−1, was from 1.5-1.1 ka. The youngest fast phase resulted in a rate of 38 +12/−11 mm yr−1 between 0.4 ka and the 1857 event. Slower phases of slip occurred from 2.9-1.5 ka, with an average rate of 12 +12/−5 mm yr−1, and from 1.1-0.4 ka, with a slip rate of 20 +9/− mm yr−1. These slip history findings are considered preliminary because they are based on a limited dataset that contains data gaps. To aide in our search for additional potentially dateable offsets preserved along the MSAF, we used available airborne LiDAR and virtual-reality visualization software Crusta. Crusta is a virtual globe application that supports real-time interactive visualization of large (>60GB) LiDAR digital elevation models and merges the mapping functionality of ArcMap with the terrain visualization capabilities of GoogleEarth. On a 100-km section of the MSAF we found 60 offsets ranging from 20 to 297 m, many of which show promise as potential slip-rate sites. We determined offset uncertainties using the slicer tool, which is a recently developed function in Crusta that allows the user to assign a fault plane by dropping nodes along a linear fault trace and interactively moving one fault block relative to the other in any slip direction. This functionality allows the user to incrementally restore fault slip until topographic features on opposite sides of the fault are aligned. This tool has been helpful in identifying, evaluating, and reconstructing possible landform offsets. This work provides the necessary foundation for future geochronologic measurements and thus is the critical first step in refining and completing the slip history of the MSAF.
Download or read book Seismotectonics of the White Mountains Fault System East Central California and West Central Nevada written by Craig M. DePolo and published by . This book was released on 1989 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exhumation Associated with Continental Strike slip Fault Systems written by Alison B. Till and published by Geological Society of America. This book was released on 2007-01-01 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure Tectonics Mineralization of the Walker Lane written by and published by . This book was released on 1992 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatiotemporal Slip Rate Variations Along Surprise Valley Fault in Relation to Pleistocene Pluvial Lakes written by Brian Nicholas Marion and published by . This book was released on 2016 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Using mapped paleoshoreline features with high-resolution topographic data and obtained radiocarbon dates on paleoshoreline tufas, I documented precise fault offsets of dated features over the last 25 ka along the Surprise Valley Fault (SVF). Fault offset measured in three lake sections within Surprise Valley ranged from 3.6 m in the southern section to 14.4 m in the central section. The offset paleoshorelines are dated to the late Pleistocene (22 ka) and were formed during the latest impoundment of pluvial Lake Surprise since the last glacial maximum. Slip rates vary along strike, assuming a fault dip of 68° with 0.25 ± 0.02 mm/yr in the northern section, 1.07 ± 0.10 mm/yr in the central section, and 0.36 ± 0.04 mm/yr in the southern lake section. Potential field modeling of profiles drawn through detailed, gridded gravity and magnetic data, suggest that the surficial scarps continue at depth, where they may accommodate greater offset. These results refine the time-averaged slip rate along the SVF and show variability spatially and temporally, allowing for correlations with changes in paleolake levels. This study suggest iv complex relation between pluvial lakes and their proximal faults that show that the lake likely influenced earthquake recurrence and slip rate along the SVF".--From the Abstract.
Download or read book New Insights Into Strain Accumulation and Release in the Central and Northern Walker Lane Pacific North American Plate Boundary California and Nevada USA written by Jayne Margret Bormann and published by . This book was released on 2013 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Walker Lane is a 100 km-wide distributed zone of complex transtensional faulting that flanks the eastern margin of the Sierra Nevada. Up to 25% of the total Pacific-North American relative right-lateral plate boundary deformation is accommodated east of the Sierra Nevada, primarily in the Walker Lane. The results of three studies in the Central and Northern Walker Lane offer new insights into how constantly accumulating plate boundary shear strain is released on faults in the Walker Lane and regional earthquake hazards. This research is based on the collection and analysis of new of geologic and geodetic datasets. Two studies are located in the Central Walker Lane, where plate boundary deformation is accommodated on northwest trending right-lateral faults, east-northeast trending left-lateral faults, and north trending normal faults. In this region, a prominent set of left-stepping, en-echelon, normal fault-bounded basins between Walker Lake and Lake Tahoe fill a gap in Walker Lane strike slip faults. Determining how these basins accommodate shear strain is a primary goal of this research. Paleoseismic and neotectonic observations from the Wassuk Range fault zone in the Walker Lake basin record evidence for at least 3 Holocene surface rupturing earthquakes and Holocene/late Pleistocene vertical slip rates between 0.4-0.7 mm/yr on the normal fault, but record no evidence of right-lateral slip along the rangefront fault. A complementary study presents new GPS velocity data that measures present-day deformation across the Central Walker Lane and infers fault slip and block rotation rates using an elastic block model. The model results show a clear partitioning between distinct zones of strain accommodation characterized by (1) right-lateral translation of blocks on northwest trending faults, (2) left-lateral slip and clockwise block rotations between east and northeast trending faults, and (3) right-lateral oblique normal slip with minor clockwise block rotations on north trending faults. Block model results show that a component of right-lateral slip in the normal-fault bounded basins is required to adequately fit the GPS data. New GPS data from the Northern Walker Lane constrains present-day slip rates on the Mohawk Valley, Grizzly Valley, and Honey Lake fault zones. Block model results predict right-lateral slip rates of 2.2 ± 0.2 mm/yr for the Mohawk Valley fault and 1.1 ± 0.4 mm/yr for the Honey Lake fault. The GPS data do not require slip on the Grizzly Valley fault, although right-lateral slip rates up to 1.2 mm/yr are allowed without increasing the block model misfit. The present-day distribution of slip between the Honey Lake and Mohawk Valley faults is opposite that predicted by latest Quaternary and Holocene geologic slip rate estimates. A temporally variable Wallace-type strain release model that includes 104-year timescale variations in fault slip rate could reconcile both datasets.
