[CIG-SHORT] Slippery Nodes in Pylith

[Charles Williams]

Hi Nick,

It’s only linear if you already know the slip direction.  In the more general case, it’s a nonlinear problem.  Also, I suspect your solution will be unstable if the friction and cohesion are both zero (I might be wrong — you can experiment).  You might need just a bit of friction and/or cohesion.  What is the slippery fault meant to represent?

Cheers,
Charles


> On 17/03/2017, at 1:42 PM, Nick Wogan <nicholaswogan at gmail.com> wrote:
> 
> Brad,
> 
> Is this the best way to do slippery faults? I thought slippery faults could be solved linearly. 
> 
> [pylithapp.timedependent.interfaces.fault]
> friction = pylith.friction.StaticFriction
> friction.db_properties.values = [friction-coefficient,cohesion]
> friction.db_properties.data = [0.0,0.0*Pa]
> 
> What am i missing?
> Nick
> 
> On Thu, Mar 16, 2017 at 4:32 PM, Brad Aagaard <baagaard at usgs.gov <mailto:baagaard at usgs.gov>> wrote:
> On 03/16/2017 04:29 PM, Nick Wogan wrote:
> Hi,
> 
> Is there a slippery nodes option for faults available?
> 
> Thanks,
> Nick
> 
> See Section 6.4.5 Dynamic Earthquake Rupture in the PyLith v2.1.4 manual.
> 
> Regards,
> Brad
> 
> 
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