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Title: | Weak mantle in NW India probed by geodetic measurements following the 2001 Bhuj earthquake |
Authors: | Chandrasekhar, D.V. Bürgmann, Roland Reddy, C.D. Sunil, P.S. Schmidt, David A. |
Keywords: | Lithospheric rheology Postseismic deformation Intraplate earthquakes Viscosity Bhuj earthquake |
Issue Date: | 2009 |
Citation: | Earth and Planetary Science Letters, v.280, p.229-235, 2009, doi: 10.1016/j.epsl.2009.01.039 |
Abstract: | 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. |
URI: | http://localhost:8080/xmlui/handle/123456789/543 |
Appears in Collections: | SEG_Reprints |
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File | Description | Size | Format | |
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ReddyCD_SunilPS_etal_EPSL_2009.pdf Restricted Access | Reprint | 3.52 MB | Adobe PDF | View/Open Request a copy |
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