BARGEN continuous GPS data across the eastern Basin and Range province, and implications for fault system dynamics

Nathan A. Niemi, Brian P. Wernicke, Anke M. Friedrich, Mark Simons, Richard A Bennett, James L. Davis

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We collected data from a transect of continuous Global Positioning System (GPS) sites across the eastern Basin and Range province at latitude 39°N from 1997-2000. Intersite velocities define a region ∼350 km wide of broadly distributed strain accumulation at ∼10 nstr yr-1. On the western margin of the region, site EGAN, ∼10 km north of Ely, Nevada, moved at a rate of 3.9 ± 0.2 mm yr-1 to the west relative to site CAST, which is on the Colorado Plateau. Velocities of most sites to the west of Ely moved at an average rate of ∼3 mm yr-1 relative to CAST, defining an area across central Nevada that does not appear to be extending significantly. The late Quaternary geological velocity field, derived using seismic reflection and neotectonic data, indicates a maximum velocity of EGAN with respect to the Colorado Plateau of ∼4 mm yr -1, also distributed relatively evenly across the region. The geodetic and late Quaternary geological velocity fields, therefore, are consistent, but strain release on the Sevier Desert detachment and the Wasatch fault appears to have been anomalously high in the Holocene. Previous models suggesting horizontal displacement rates in the eastern Basin and Range near 3 mm yr-1, which focused mainly along the Wasatch zone and Intermountain seismic belt, may overestimate the Holocene Wasatch rate by at least 50 per cent and the Quaternary rate by nearly an order of magnitude, while ignoring potentially major seismogenic faults further to the west.

Original languageEnglish (US)
Pages (from-to)842-862
Number of pages21
JournalGeophysical Journal International
Volume159
Issue number3
DOIs
StatePublished - Dec 2004

Fingerprint

Global Positioning System
Global positioning system
Dynamical systems
GPS
Colorado Plateau (US)
basin
velocity distribution
Holocene
plateau
neotectonics
deserts
detachment
seismic reflection
margins
transect
desert
rate
province

Keywords

  • Continental deformation
  • Fault slip
  • Normal faulting
  • Quaternary
  • Satellite geodesy
  • Stress distribution

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

BARGEN continuous GPS data across the eastern Basin and Range province, and implications for fault system dynamics. / Niemi, Nathan A.; Wernicke, Brian P.; Friedrich, Anke M.; Simons, Mark; Bennett, Richard A; Davis, James L.

In: Geophysical Journal International, Vol. 159, No. 3, 12.2004, p. 842-862.

Research output: Contribution to journalArticle

Niemi, Nathan A. ; Wernicke, Brian P. ; Friedrich, Anke M. ; Simons, Mark ; Bennett, Richard A ; Davis, James L. / BARGEN continuous GPS data across the eastern Basin and Range province, and implications for fault system dynamics. In: Geophysical Journal International. 2004 ; Vol. 159, No. 3. pp. 842-862.
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