Insights into distributed plate rates across the Walker Lane from GPS geodesy

Contemporary geodetic slip rates are observed to be approximately two times greater than late Pleistocene geologic slip rates across the southern Walker Lane. Using a dense GPS network, we compare the present‐day crustal velocities to observed geologic slip rates in the region. We find that the Walker Lane is characterized by a smooth transition from westward extension in the Basin and Range to northwestward motion of the Sierra Nevada block. The GPS velocity field indicates that (1) plate parallel (N37°W) velocities define a velocity differential of 10.6 ± 0.5 mm/yr between the western Basin and Range and the Sierra Nevada block, (2) there is ~2 mm/yr of contemporary extension perpendicular to the normal faults of the Silver Peak‐Lone Mountain extensional complex, and (3) most of the observed discrepancy in long‐ and short‐term slip rates occurs across Owens Valley. We believe the discrepancy is due to distributed strain and underestimated geologic slip rates.

[1]  Jeffrey Lee,et al.  Pliocene sinistral slip across the Adobe Hills, eastern California–western Nevada: Kinematics of fault slip transfer across the Mina deflection , 2013 .

[2]  M. Caffee,et al.  Distributed extensional deformation in a zone of right‐lateral shear: Implications for geodetic versus geologic rates of deformation in the eastern California shear zone‐Walker Lane , 2012 .

[3]  W. Hammond,et al.  Neotectonics, geodesy, and seismic hazard in the Northern Walker Lane of Western North America: Thirty kilometers of crustal shear and no strike-slip? , 2011 .

[4]  R. Finkel,et al.  Spatial and temporal constancy of seismic strain release along an evolving segment of the Pacific-North America plate boundary , 2011 .

[5]  F. Phillips,et al.  The role of low-angle normal faulting in active tectonics of the northern Owens Valley, California , 2011 .

[6]  K. L. Frankel,et al.  Temporal variations in extension rate on the Lone Mountain fault and strain distribution in the eastern California shear zone–Walker Lane , 2010 .

[7]  Richard G. Gordon,et al.  Geologically current plate motions , 2010 .

[8]  S. Owen,et al.  The angular velocities of the plates and the velocity of Earth's centre from space geodesy , 2010 .

[9]  G. Blewitt,et al.  Geodetic constraints on contemporary deformation in the northern Walker Lane: 3. Central Nevada seismic belt postseismic relaxation , 2009 .

[10]  Sridhar Anandakrishnan,et al.  Late Pleistocene slip rate along the Owens Valley fault, eastern California , 2008 .

[11]  W. Hammond,et al.  Crustal deformation across the Sierra Nevada, northern Walker Lane, Basin and Range transition, western United States measured with GPS, 2000–2004 , 2007 .

[12]  E. Kirby,et al.  Temporal variations in slip rate of the White Mountain Fault Zone, Eastern California , 2006 .

[13]  S. Wesnousky.  The San Andreas and Walker Lane fault systems, western North America: transpression, transtension, cumulative slip and the structural evolution of a major transform plate boundary , 2005 .

[14]  Robert McCaffrey,et al.  Block kinematics of the Pacific-North America plate boundary in the southwestern United States from inversion of GPS, seismological, and geologic data , 2005 .

[15]  R. Bennett,et al.  Contemporary strain rates in the northern Basin and Range province from GPS data , 2003 .

[16]  Lewis A. Owen,et al.  Holocene slip rates along the Owens Valley fault, California: Implications for the recent evolution of the Eastern California Shear Zone , 2001 .

[17]  J. C. Savage,et al.  Strain accumulation across the Eastern California Shear Zone at latitude 36°30′N , 2000 .

[18]  Meghan S. Miller,et al.  Present‐day motion of the Sierra Nevada block and some tectonic implications for the Basin and Range province, North American Cordillera , 2000 .

[19]  E. Hearn,et al.  Kinematics of the southern Walker Lane Belt and motion of the Sierra Nevada block, California , 1998 .

[20]  J. C. Savage,et al.  Viscoelastic coupling model of the San Andreas Fault along the Big Bend, southern California , 1998 .

[21]  J. Zumberge,et al.  Precise point positioning for the efficient and robust analysis of GPS data from large networks , 1997 .

[22]  M. Reheis,et al.  Late Cenozoic history and slip rates of the Fish Lake Valley, Emigrant Peak, and Deep Springs fault zones, Nevada and California , 1997 .

[23]  Timothy H. Dixon,et al.  Constraints on present‐day Basin and Range deformation from space geodesy , 1995 .

[24]  Roy K. Dokka,et al.  Late Cenozoic strike-slip faulting in the Mojave Desert, California , 1990 .

[25]  J. C. Savage,et al.  Geodetic determination of relative plate motion in central California , 1973 .

[26]  Timothy H. Dixon,et al.  Paleoseismology and Global Positioning System: Earthquake-cycle effects and geodetic versus geologic fault slip rates in the Eastern California shear zone , 2003 .