Dynamics of the Pacific-North American Plate Boundary in the Western United States
- 4 February 2000
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 287 (5454), 834-836
- https://doi.org/10.1126/science.287.5454.834
Abstract
The vertically averaged deviatoric stress tensor field within the western United States was determined with topographic data, geoid data, recent global positioning system observations, and strain rate magnitudes and styles from Quaternary faults. Gravitational potential energy differences control the large fault-normal compression on the California coast. Deformation in the Basin and Range is driven, in part, by gravitational potential energy differences, but extension directions there are modified by plate interaction stresses. The California shear zone has relatively low vertically averaged viscosity of about 1021 pascal·seconds, whereas the Basin and Range has a higher vertically averaged viscosity of 1022pascal·seconds.Keywords
This publication has 32 references indexed in Scilit:
- Deformation kinematics in the western United States determined from Quaternary fault slip rates and recent geodetic dataJournal of Geophysical Research, 1999
- WESTERN UNITED STATES EXTENSION: How the West was WidenedAnnual Review of Earth and Planetary Sciences, 1999
- Present-Day Deformation Across the Basin and Range Province, Western United StatesScience, 1999
- Crustal collapse, mantle upwelling, and Cenozoic extension in the North American CordilleraTectonics, 1998
- The role of gravitational potential energy in active deformation in the southwestern United StatesNature, 1996
- Viscosity estimates for the crust and upper mantle from patterns of lacustrine shoreline deformation in the Eastern Great BasinJournal of Geophysical Research, 1994
- Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motionsGeophysical Research Letters, 1994
- On the gravitational potential of the Earth's lithosphereTectonics, 1994
- Physical state of the western U.S. upper mantleJournal of Geophysical Research, 1994
- Tectonics and topography for a lithosphere containing density heterogeneitiesTectonics, 1982