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DOI | 10.1093/gji/ggt189 |
Kinematics of rotating panels of E-W faults in the San Andreas system: what can we tell from geodesy? | |
Platt, J. P.; Becker, T. W. | |
通讯作者 | Platt, J. P. |
来源期刊 | GEOPHYSICAL JOURNAL INTERNATIONAL
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ISSN | 0956-540X |
出版年 | 2013 |
卷号 | 194期号:3页码:1295-1301 |
英文摘要 | Sets of E- to NE-trending sinistral and/or reverse faults occur within the San Andreas system, and are associated with palaeomagnetic evidence for clockwise vertical-axis rotations. These structures cut across the trend of active dextral faults, posing questions as to how displacement is transferred across them. Geodetic data show that they lie within an overall dextral shear field, but the data are commonly interpreted to indicate little or no slip, nor any significant rate of rotation. We model these structures as rotating by bookshelf slip in a dextral shear field, and show that a combination of sinistral slip and rotation can produce the observed velocity field. This allows prediction of rates of slip, rotation, fault-parallel extension and fault-normal shortening within the panel. We use this method to calculate the kinematics of the central segment of the Garlock Fault, which cuts across the eastern California shear zone at a high angle. We obtain a sinistral slip rate of 6.1 +/- 1.1 mm yr(-1), comparable to geological evidence, but higher than most previous geodetic estimates, and a rotation rate of 4.0 +/- 0.7 degrees Myr(-1) clockwise. The western Transverse Ranges transect a similar shear zone in coastal and offshore California, but at an angle of only 40 degrees. As a result, the faults, which were sinistral when they were at a higher angle to the shear zone, have been reactivated in a dextral sense at a low rate, and the rate of rotation of the panel has decreased from its long-term rate of similar to 5 degrees to 1.6 degrees +/- 0.2 degrees Myr(-1) clockwise. These results help to resolve some of the apparent discrepancies between geological and geodetic slip-rate estimates, and provide an enhanced understanding of the mechanics of intracontinental transform systems. |
英文关键词 | Continental margins: transform Continental tectonics: strike-slip and transform Dynamics and mechanics of faulting Fractures and faults Kinematics of crustal and mantle deformation Crustal structure North America |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000323442800003 |
WOS关键词 | CALIFORNIA SHEAR ZONE ; WESTERN TRANSVERSE RANGES ; AMERICA PLATE BOUNDARY ; VERTICAL-AXIS ROTATION ; SOUTHERN-CALIFORNIA ; STRAIN ACCUMULATION ; CRUSTAL BLOCKS ; GARLOCK FAULT ; MOJAVE DESERT ; MANTLE FLOW |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/177398 |
作者单位 | Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA |
推荐引用方式 GB/T 7714 | Platt, J. P.,Becker, T. W.. Kinematics of rotating panels of E-W faults in the San Andreas system: what can we tell from geodesy?[J],2013,194(3):1295-1301. |
APA | Platt, J. P.,&Becker, T. W..(2013).Kinematics of rotating panels of E-W faults in the San Andreas system: what can we tell from geodesy?.GEOPHYSICAL JOURNAL INTERNATIONAL,194(3),1295-1301. |
MLA | Platt, J. P.,et al."Kinematics of rotating panels of E-W faults in the San Andreas system: what can we tell from geodesy?".GEOPHYSICAL JOURNAL INTERNATIONAL 194.3(2013):1295-1301. |
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