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Louise Olsen-Kettle, Earth Systems Science Computational Centre, The University of Queensland, AUSTRALIA

Title: Earthquake dynamics and complexity

Time:    Wednesday, April 29, 2009, 3pm
Place:   Building 28, Room 2.123, Campus Golm, Universitaet Potsdam

Abstract:

Earthquake dynamics and complexity
L.M. Olsen-Kettle,S. Langer, D. Weatherley, H.-B. Mühlhaus and L. Gross
Earth Systems Science Computational Centre, The University of Queensland, Australia (l.kettle1@uq.edu.au)

We explore several fundamental issues in seismology. The first part relates to 
the dynamics of fault rupture: does slip propagate in the form of an expanding crack or 
as a narrow self-healing pulse? 
When does supershear rupture arise? 
When does unilateral rupture occur at bimaterial faults? 
The second relates to the origin of earthquake complexity. 
Although the evidence for complexity is overwhelming the dynamics of faulting 
is still poorly understood. As shown by earlier studies we also show that 
complexity and narrow rupture pulses are closely coupled and both depend on 
the presence of strongly rate dependent friction. 
However we add further fuel to these arguments and show that nonlinear, 
scale-dependent processes may also be a significant factor in the generation 
of slip complexity and pulse-like rupture. 
We demonstrate that strongly rate-dependent friction may lead to scale-dependent processes 
arising from nonlinearities in the underlying friction. 
Complexity can also arise through interacting fault systems. 
We investigate the role of both dynamic and static stress triggering on earthquake 
triggering in dilational and compressional fault systems.


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