1992 Landers earthquake


Ground motion of the Landers scenario in terms of absolute particle velocity.



We simulated the Mw. 7.3 Landers scenario on a branched fault system in a model including geologically constrained fault geometries, topography, the local velocity structure and stress conditions based on geomechanical modeling.





The non-linear interaction of the seismic waves with the fault system itself and the spatio-temporally heterogeneous rupture process add further complexity, causing the emergence of multiple rupture fronts.
The resolution in a model consisting in almost 200 mio. elements leads to accelerograms with frequencies up to 10 Hz.

In this high-resolution earthquake model complex rupture
dynamics evolve across the fault system .
Successively, all fault segments of the model rupture spontaneously. Throughout the rupture process we observe fault branching as well as rupture jumps between the discrete fault planes, leaving some segments partially locked.

(for more details, especially from a computational perspective, see:
Heinecke et al. , Petascale High Order Dynamic Rupture Earthquake Simulations on Heterogeneous Supercomputers.  (2014). Gordon Bell Finalist. doi:10.1109/SC.2014.6 )