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Post-Seismic Deformation

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Global Dynamics of the Earth

Part of the book series: Modern Approaches in Geophysics ((MAGE,volume 20))

Abstract

The occurrence of faulting in the lithosphere is responsible for an instantaneous deformation of the Earth’s surface, which is called co-seismic deformation. In response to the induced elastic stress in the mantle, creep occurs in this deep portion of the planet, or in the ductile portion of the crust, via viscoelastic stress relaxation. Immediately after the occurrence of the earthquake, the mechanism of stress release due to viscous flow in the ductile part of the Earth’s crust starts to operate, leading to post-seismic deformation. The delayed deformation of the lithosphere caused by stress relaxation in the mantle or in the low viscosity layers of the crust is called post-seismic deformation. In this section we deal with the effects of a realistic PREM-based (Dziewonski and Anderson, 1981) lithosphere and mantle stratification on post-seismic deformation after a series of preliminary analyses based on simplified models carrying at most four layers, namely the lithosphere, the upper and lower mantle and the core. Relaxation is here considered to occur in the mantle, while in the following section the effects of stress relaxation in the ductile portion of the crust will be considered.

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© 2004 Springer Science+Business Media Dordrecht

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Sabadini, R., Vermeersen, B. (2004). Post-Seismic Deformation. In: Global Dynamics of the Earth. Modern Approaches in Geophysics, vol 20. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1709-0_8

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  • DOI: https://doi.org/10.1007/978-94-017-1709-0_8

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-1268-6

  • Online ISBN: 978-94-017-1709-0

  • eBook Packages: Springer Book Archive

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