کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4678916 | 1634876 | 2009 | 7 صفحه PDF | دانلود رایگان |
Far-reaching transient surface deformation following the 2001 Mw 7.6 Bhuj intraplate earthquake in NW India reveals visco-elastic flow in the mantle with only modest contributions from crustal relaxation processes. The relatively rapid decay of GPS-measured deformation rates indicates increasing effective viscosities of the mantle from 3 × 1018 Pa s in the first 6 months to 2 × 1019 Pa s during the 6-year observation period, consistent with a time and stress-dependent rheology, such as power-law flow by dislocation creep. The observed data do not require relaxation of the lower crust over these time scales and indicate a lower bound of 1020 Pa s on its effective viscosity. The unusually low viscous strength of the mantle below the earthquake epicentral region may be the long-lasting result of thermal weakening by the late Cretaceous Deccan plume and may be responsible for the unusually active intraplate seismicity in the region.
Journal: Earth and Planetary Science Letters - Volume 280, Issues 1–4, 15 April 2009, Pages 229–235