We use new space geodetic data from very long baseline interferometry
and satellite laser ranging combined with other geodetic and geologic
data to study contemporary deformation in the Basin and Range province
of the western United States. Northwest motion of the central Sierra
Nevada block relative to stable North America, a measure of integrated
Basin and Range deformation, is 12.1+/-1.2 mm/yr oriented N38 degrees
W+/-5 degrees (one standard error), in agreement with previous geolog
ical estimates within uncertainties. This velocity reflects both east-
west extension concentrated in the eastern Basin and Range and north-n
orthwest directed right lateral shear concentrated in the western Basi
n and Range. Fly, Nevada is moving west at 4.9+/-1.3 mm/yr relative to
stable North America, consistent with dip-slip motion on the north st
riking Wasatch fault and other north striking normal faults. Compariso
n with ground-based geodetic data suggests that most of this motion is
accommodated within similar to 50 lan of the Wasatch fault zone. Pale
oseismic data for the Wasatch fault zone and slip rates based on seism
ic energy release in the region both suggest much lower slip rates. Th
e discrepancy may be explained by some combination of additional defor
mation away from the Wasatch fault itself, aseismic slip, or a seismic
rate that is anomalously low with respect to longer time averages. De
formation in the western Basin and Range province is also largely conf
ined to a relatively narrow boundary zone and in our study area is par
titioned into the eastern California shear zone, accommodating 10.7+/-
1.6 mm/yr of north-northwest directed right-lateral shear, and a small
component (similar to 1 mm/yr) of west-southwest - east-northeast ext
ension. A slip rate budget for major strike-slip faults in our study a
rea based on a combination of local geodetic or late Quaternary geolog
ic data and the regional space geodetic data suggests the following ra
tes of right-lateral slip: Owens Valley fault zone, 3.9+/-1.1 mm/yr; D
eath Valley-Furnace Creek fault zone, 3.3+/-2.2 mm/yr; White Mountains
fault zone in northern Owens Valley, 3.4+/-1.2 mm/yr; Fish Lake Valle
y fault zone, 6.2+/-2.3 mm/yr. In the last few million years the locus
of right-lateral shear in the region has shifted west and become more
north trending as slip on the northwest striking Death Valley-Furnace
Creek fault zone has decreased and is increasingly accommodated on th
e north-northwest striking Owens Valley fault zone.