Walker Lane GPS Rates

The interseismic motion of GPS stations in a tectonically active, diffuse, strike-slip shear zone provide constraints on the overall deformation budget that can be compared to the summation of geologically-estimated fault slip rates to understand regional strain accommodation. The Walker Lane GPS velocities in this dataset represent a subset of GPS stations included in the Nevada Geodetic Laboratory MIDAS velocity solution (Blewitt et al., 2016, 2018; accessible at http://geodesy.unr.edu/velocities/midas.NA12.txt, last accessed 11/19/2020) . This dataset includes velocities for all GPS stations located between 34° N – 43° N latitude and 114° W – 123° W longitude with time series longer than 2.5 years from the semi-continuous MAGNET network operated by the Nevada Geodetic Laboratory (Blewitt et al., 2009) and neighboring continuous GPS stations. The MIDAS velocities are calculated using daily position data collected through August 2019 presented in the NA12 reference frame (Blewitt et al., 2013) , and corrected for the postseismic effects of historic ruptures in and surrounding the Walker Lane. The MIDAS algorithm is a median trend estimator that mitigates both seasonality and step discontinuities in the times series (Blewitt et al., 2016). The resulting velocities are insensitive to the coseismic and postseismic effects of earthquakes that occurred after the midpoint of the time series (Blewitt et al., 2016) , such as the July 2019 Ridgecrest, CA M w 6.4 and 7.1 sequence, but must be corrected for the post-seismic effects of earthquakes that occurred prior to the middle of time series, such as the historic surface rupturing earthquakes in Central Nevada Seismic Belt and the 1993 Landers M w 7.3, and 1999 Hector Mine M w 7.0 events. We apply the viscoelastic postseismic relaxation correction from Bormann et al. (2013) that was developed using the method of Hammond et al. (2010) and the preferred western Basin and Range lower crust (10 20.5 Pa-s) and upper mantle (10 19 Pa-s) viscosity model of Hammond et al. (2009).

When using this dataset, please also cite Blewitt et al (2018) as the authors of the original MIDAS NA12 reference frame velocity solution is the basis for our postseismic corrected Walker Lane velocities: Blewitt, G., Hammond, W.C., Kreemer, C., 2018. Harnessing the GPS Data Explosion for Interdisciplinary Science. Eos. https://doi.org/10.1029/2018EO104623.