Abstract
Studies of the Earth's response to large earthquakes can be viewed as large rock deformation experiments in which sudden stress changes induce viscous flow in the lower crust and upper mantle that lead to observable postseismic surface deformation1. Laboratory experiments suggest that viscous flow of deforming hot lithospheric rocks is characterized by a power law in which strain rate is proportional to stress raised to a power, n (refs 2, 3). Most geodynamic models of flow in the lower crust and upper mantle, however, resort to newtonian (linear) stress–strain rate relations4,5,6,7,8,9,10. Here we show that a power-law model of viscous flow in the mantle with n = 3.5 successfully explains the spatial and temporal evolution of transient surface deformation following the 1992 Landers11 and 1999 Hector Mine12 earthquakes in southern California. A power-law rheology implies that viscosity varies spatially with stress causing localization of strain, and varies temporally as stress evolves, rendering newtonian models untenable. Our findings are consistent with laboratory-derived flow law parameters for hot and wet olivine—the most abundant mineral in the upper mantle—and support the contention that, at least beneath the Mojave desert5,6, the upper mantle is weaker than the lower crust.
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Acknowledgements
Funding was provided by the National Science Foundation and the Southern California Earthquake Center. GPS data were provided by the US Geological Survey and the Southern California Integrated GPS Network..
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Supplementary information
Supplementary Figure 1
Comparison of poroelastic, viscous, and combination post-Landers models. (PDF 219 kb)
Supplementary Figure 2
Comparison of poroelastic and viscous post-Hector Mine models. (PDF 256 kb)
Supplementary Figure 3
Observed and calculated GPS times series surface deformations following the Landers and Hector Mine quakes. (PDF 2031 kb)
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Freed, A., Bürgmann, R. Evidence of power-law flow in the Mojave desert mantle. Nature 430, 548–551 (2004). https://doi.org/10.1038/nature02784
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DOI: https://doi.org/10.1038/nature02784
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