Articles | Volume 22, issue 3
Nonlin. Processes Geophys., 22, 349–359, 2015
https://doi.org/10.5194/npg-22-349-2015
Nonlin. Processes Geophys., 22, 349–359, 2015
https://doi.org/10.5194/npg-22-349-2015

Research article 30 Jun 2015

Research article | 30 Jun 2015

Stress states and moment rates of a two-asperity fault in the presence of viscoelastic relaxation

M. Dragoni and E. Lorenzano

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Revised manuscript not accepted
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Complex interplay between stress perturbations and viscoelastic relaxation in a two-asperity fault model
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Cited articles

Amendola, A. and Dragoni, M.: Dynamics of a two-fault system with viscoelastic coupling, Nonlin. Processes Geophys., 20, 1–10, https://doi.org/10.5194/npg-20-1-2013, 2013.
Bürgmann, R. and Dresen, G.: Rheology of the lower crust and upper mantle: evidence from rock mechanics, geodesy, and field observation, Ann. Rev. Earth Planet. Sci., 36, 531–567, 2008.
Carter, N. L.: Steady state flow of rocks, Rev. Geophys. Space Phys., 14, 301–353, 1976.
Christensen, D. H. and Beck, S. L.: The rupture process and tectonic implications of the great 1964 Prince William Sound earthquake, Pure Appl. Geophys., 142, 29–53, 1994.
Cohen, S. C. and Freymueller, J. T.: Crustal Deformation in the Southcentral Alaska Subduction Zone, Adv. Geophys., 47, 1–63, 2004.
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Short summary
The paper presents new analytical solutions for both the coseismic slip and the interseismic evolution of a fault with two asperities of different strengths. It enlightens the relationship between the state of the fault before a seismic event and the number and sequence of slipping modes in the event. It shows that the knowledge of the source function of a seismic event constrains the subsequent evolution of the system. The model is applied to the fault that generated the 1964 Alaska earthquake.