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Shallow Seismic Reflection Profiling Across The San Jacinto Fault Zone In The San Jacinto Valley California
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Book Synopsis Shallow Seismic Reflection Profiling Across the San Jacinto Fault Zone in the San Jacinto Valley, California by : Darin Michael Pendergraft
Download or read book Shallow Seismic Reflection Profiling Across the San Jacinto Fault Zone in the San Jacinto Valley, California written by Darin Michael Pendergraft and published by . This book was released on 1993 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geologic and Structural Characterization of Shallow Seismic Properties Along the San Jacinto Fault at Sage Brush Flat, Southern California by : Adam Micahel Wade
Download or read book Geologic and Structural Characterization of Shallow Seismic Properties Along the San Jacinto Fault at Sage Brush Flat, Southern California written by Adam Micahel Wade and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of fault zones is a critical component to understanding earthquake mechanics and seismic hazard evaluations. Models or simulations of potential earthquakes, based on fault zone properties, are a first step in mitigating the hazard. Theoretical models of earthquake ruptures along a bi-material interface result in asymmetrical damage and preferred rupture propagation direction. Results include greater damage intensity within stiffer material and preferred slip in the direction of the more compliant side of the fault. Data from a dense seismic array along the Clark strand of the SJFZ at Sage Brush Flat (SGB) near Anza, CA, allows for analysis and characterization of shallow (
Book Synopsis I. Seismotectonics of the San Jacinto Fault Zone and the Anza Seismic Gap ; II. Imaging the Shallow Crust in Volcanic Areas with Earthquake Shear Waves by : Christopher O'Neill Sanders
Download or read book I. Seismotectonics of the San Jacinto Fault Zone and the Anza Seismic Gap ; II. Imaging the Shallow Crust in Volcanic Areas with Earthquake Shear Waves written by Christopher O'Neill Sanders and published by . This book was released on 1989 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Geological Survey Open-file Report by :
Download or read book U.S. Geological Survey Open-file Report written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis National Earthquake Hazards Reduction Program, Summaries of Technical Reports Volume XXXV by :
Download or read book National Earthquake Hazards Reduction Program, Summaries of Technical Reports Volume XXXV written by and published by . This book was released on 1994 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interpretation of Shallow Crustal Structure of the Imperial Valley, California, from Seismic Reflection Profiles by : Lupe K. Severson
Download or read book Interpretation of Shallow Crustal Structure of the Imperial Valley, California, from Seismic Reflection Profiles written by Lupe K. Severson and published by . This book was released on 1987 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A COCORP Deep Seismic Reflection Profile Across the San Andreas Fault, Parkfield, California by : George Henry Long
Download or read book A COCORP Deep Seismic Reflection Profile Across the San Andreas Fault, Parkfield, California written by George Henry Long and published by . This book was released on 1981 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geophysical Investigation of the San Jacinto Valley, Riverside County California by : John David Fett
Download or read book Geophysical Investigation of the San Jacinto Valley, Riverside County California written by John David Fett and published by . This book was released on 1968 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A High Resolution Paleoseismic Study in the Southern San Jacinto Fault Zone, Imperial Valley, California by : Daniel Ragona
Download or read book A High Resolution Paleoseismic Study in the Southern San Jacinto Fault Zone, Imperial Valley, California written by Daniel Ragona and published by . This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismotectonics of the San Jacinto Fault Zone and the Anza Seismic Gap. Imaging the Shallow Crust in Volcanic Areas with Earthquake Shear Waves by : Christopher O'Neill Sanders
Download or read book Seismotectonics of the San Jacinto Fault Zone and the Anza Seismic Gap. Imaging the Shallow Crust in Volcanic Areas with Earthquake Shear Waves written by Christopher O'Neill Sanders and published by . This book was released on 1987 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quaternary Geologic Evolution of the Northern San Jacinto Fault Zone by : Katherine Jean Kendrick
Download or read book Quaternary Geologic Evolution of the Northern San Jacinto Fault Zone written by Katherine Jean Kendrick and published by . This book was released on 1999 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Straightening of the Northern San Jacinto Fault, California by :
Download or read book Straightening of the Northern San Jacinto Fault, California written by and published by . This book was released on 2011 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: New CPT and trench observations along the Claremont fault at Mystic Lake indicate that the main strand of the Claremont fault has jumped nearly a half kilometer westward into the San Jacinto releasing step-over during the late Quaternary. Previous seismic reflection data also suggest the presence of a young fault that cuts the middle of Mystic Lake farther west, and seismicity observations are consistent with the idea that new fault strands have formed within the step-over zone. Finally, new paleoseismic data suggest that some late Holocene earthquakes may have jumped the step-over. All of these observations suggest that the San Jacinto step-over, which has been used as the primary basis for segmenting the northern San Jacinto fault zone, is being by-passed and that the fault zone may now be capable of larger earthquakes than previously expected that may rival those on the San Andreas Fault.
Book Synopsis Study of Seismic Activity by Selective Trenching Along the San Jacinto Fault Zone, Southern California by : P. M. Merifield
Download or read book Study of Seismic Activity by Selective Trenching Along the San Jacinto Fault Zone, Southern California written by P. M. Merifield and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Southward Continuation of the San Jacinto Fault Zone Through and Beneath the Extra and Elmore Ranch Left-Lateral Fault Arrays, Southern California by : Steven Jesse Thornock
Download or read book Southward Continuation of the San Jacinto Fault Zone Through and Beneath the Extra and Elmore Ranch Left-Lateral Fault Arrays, Southern California written by Steven Jesse Thornock and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Clark fault is one of the primary dextral faults in the San Jacinto fault zone system, southern California. Previous mapping of the Clark fault at its southern termination in the San Felipe Hills reveals it as a broad right lateral shear zone that ends north of the crossing, northeast-striking, left-lateral Extra fault. We investigate the relationship between the dextral Clark fault and the sinistral Extra fault to determine whether the Clark fault continues to the southeast. We present new structural, geophysical and geomorphic data that show that the Extra fault is a ~7 km wide, coordinated fault array comprised of four to six left-lateral fault zones. Active strands of the Clark fault zone persists through the Extra fault array to the Superstition Hills fault in the subsurface and rotate overlying sinistral faults in a clockwise sense. New detailed structural mapping between the San Felipe and Superstition Hills confirms that there is no continuous trace of the Clark fault zone at the surface but the fault zone has uplifted an elongate region ~950 km. sq. of latest Miocene to Pleistocene basin-fill in the field area and far outside of it. Detailed maps and cross sections of relocated micro earthquakes show two earthquake swarms, one in 2007 and another in 2008 that project toward the San Felipe Hills, Tarantula Wash and Powerline strands of the dextral Clark fault zone in the San Felipe Hills, or possibly toward the parts of the Coyote Creek fault zone. We interpret two earthquake swarms as activating the San Jacinto fault zone beneath the Extra fault array. These data coupled with deformation patterns in published InSAR data sets suggest the presence of possible dextral faults at seismogenic depths that are not evident on the surface. We present field, geophysical and structural data that demonstrate dominantly left-lateral motion across the Extra fault array with complex motion on secondary strands in damage zones. Slickenlines measured within three fault zones in the Extra fault array reveal primarily strike-slip motion on the principal fault strands. Doubly-plunging anticlines between right-stepping en echelon strands of the Extra fault zone are consistent with contraction between steps of left-lateral faults and are inconsistent with steps in dominantly normal faults. Of the 21 published focal mechanisms for earthquakes in and near the field area, all record strike-slip and only two have a significant component of extension. Although the San Sebastian Marsh area is dominated by northeast-striking left lateral faults at the surface, the Clark fault is evident at depth beneath the field area, in rotated faults, in microseismic alignments, and deformation in the Sebastian uplift. Based on these data the Clark fault zone appears to be continuous at depth to the Superstition Hills fault, as Fialko (2006) hypothesized with more limited data sets.
Book Synopsis Publications of the Geological Survey by :
Download or read book Publications of the Geological Survey written by and published by . This book was released on 1971 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paleomagnetic Rotations and Continental Deformation by : Catherine Kissel
Download or read book Paleomagnetic Rotations and Continental Deformation written by Catherine Kissel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most interesting results obtained in the last two decades in the study of crustal deformation has been the recognition that large regions of continental crust undergo rotations about vertical axis during deformation. Proof of such rotations has come through the paleomagnetic studies, which reveal rotations when paleomagnetic declinations within the deforming region arc compared with those found in coeval rocks in the stable regions outside the deforming zone. Such rotations were first described in Oregon then in the North American Cordilleras and in Southern California and were a surprise to everyone. Even in California which, as a result of oil exploration, was among the best geologically explored regions in the world, no one could claim to have predicted that these rotations would be found. Rotations have subsequently been found in other areas of recent continental tectonic activity, notably in the Basin and Range province, New Zealand, the Andes, Greece and Western Turkey, so that they appear as an important feature of continental deformation.
Book Synopsis Incipient Pulverization at Shallow Burial Depths Along the San Jacinto Fault, Southern California by :
Download or read book Incipient Pulverization at Shallow Burial Depths Along the San Jacinto Fault, Southern California written by and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: We studied the fault zone architecture and searched for evidence of shallow damage production in sandstones along the Clark strand of the San Jacinto Fault in Rock House Canyon, western Salton Trough, California. Here, the fault juxtaposes tonalite on the northeast against the Bautista sandstone on the southwest. The fault core and associated damage zone is visible at two separate fault exposures that have experienced total burial depths of ~70 m and ~120m, respectively. Physical damage in the lower exposure resembles incipient pulverization in the sandstone “wallrock”, and exhibits a preferred crack orientation that is perpendicular to the fault, which in turn suggests the occurrence of significant in situ brittle deformation at this very shallow burial depth. The upper exposure at 70 m burial depth displays very little evidence of fragmentation of sand grains outside of the fault core; together, these observations suggest that the onset of pulverization occurs between about 70 and 120 m depth. Elemental and bulk mass redistributions, along with changes in observed clay mineralogy, indicate the occurrence of chemical changes resulting from fluid flow at both locations. Based on our observations and analysis of the data, we conclude that the observed physical damage and fluid related alterations are likely the result of stresses produced by dynamic rupture.
