105 Chapter 4 Quasi-dynamic versus fully-dynamic simulations of earthquakes sequences on heterogeneous faults with and without enhanced coseismic weakening Marion Thomas, Nadia Lapusta, Hiroyuki Noda, and Jean-Philippe Avouac Abstract Theoretical fault models and computer simulations of fault slip can reveal the role and relative im- portance of different factors on the manner in which slip accumulates on faults. Such factors include various forms and parameters of friction laws, pore pressure evolution, and fault non-planarity. To study long deformation histories, most simulation methods do not incorporate full inertial effects during simulated fast slip. In quasi-static methods, a series of static problems is solved, with the loading advanced in time. However, such methods cannot simulate fast slip during seismic events, and earthquakes have to be added to such simulations in a kinematic fashion. That is why so-called quasi-dynamic methods have become increasingly popular, which approximately account for inertial effects (and hence seismic radiation) during simulated earthquakes through a radiation damping term. Such methods allow to continue simulations through the seismic phase, without having to pay significant additional memory and computational costs associated with modeling true wave-mediated effects. In this study, we compare the results of quasi-dynamic simulations and fully-dynamic ones, in with all wave effects are accounted for during simulated earthquakes. We consider the long-term fault
Quasi-dynamic versus fully-dynamic simulations of earthquakes sequences on heterogeneous faults with and without enhanced coseismic weakening
May 19, 2023
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