Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.252..481f&link_type=abstract
Earth and Planetary Science Letters, Volume 252, Issue 3-4, p. 481-489.
Mathematics
Logic
23
Scientific paper
Far-field continuous Global Positioning System (GPS) time-series data following the 2002 M7.9 Denali, Alaska earthquake imply that mantle viscoelastic rheology is stress-dependent. A linear viscous mantle cannot explain fast early displacement rates at the surface that rapidly decay with time, whereas a power-law rheology where strain rate is proportional to stress raised to the power of 3.5 ± 0.5 provides decay rates and spatial patterns in agreement with observations. This is consistent with laboratory measurements for hot, wet olivine, implying a hydrated mantle and a relatively thin (60-km-thick) lithosphere beneath south-central Alaska. These results suggest that the viscous strength of the lithosphere varies both spatially and temporally, and that effective viscosities inferred from different loading events or observational time-periods can differ by up to several orders of magnitude. Thus, the very conditions that enable the inference of rheologic strength transient loading and unloading events significantly alter the effective viscosity.
Bürgmann Roland
Calais Eric
Freed Andrew M.
Freymueller Jeff
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