What drives short- and long-term crustal deformation in the southwestern United States?

Details What drives short- and long-term crustal deformation in the southwestern United States? What drives short- and long-term crustal deformation in the southwestern United States?

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3704306y&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 4, CiteID L04306

Physics

3

Tectonophysics: Continental Margins: Transform, Tectonophysics: Continental Tectonics: General (0905), Tectonophysics: Plate Boundary: General (3040), Tectonophysics: Rheology: Crust And Lithosphere (8031), Tectonophysics: Stresses: Crust And Lithosphere

Scientific paper

The driving forces for crustal deformation are often inferred from the crustal kinematics. In the Southwestern United States, however, crustal kinematics delineated by the Global Positioning System (GPS) measurements differs significantly from that reconstructed from the geological records. This discrepancy is likely due to the different timescales reflected in these datasets. Here we explore the geodynamic links between the short- and long-term crustal deformation in the Southwestern US using regional-scale three-dimensional elastic and viscous finite element models. We show that the GPS-measured short-term crustal deformation results mainly from interseismic traction along the San Andreas Fault (SAF). Much of the short-term strain is transient that does not contribute to permanent deformation. The long-term traction on the SAF is ˜10 MPa lower than that constrained by the GPS data, which, together with gravitational spreading, can reproduce the geologically reconstructed long-term crustal deformation.

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