[CIG-SHORT] Velocity value for nodes on free surface

[Baillard]

Hi Brad, 

 I just followed the 2d subduction example on how to define the displacement for the crust over the mantle. This is more an observation than a real problem in fact. Thanks for the quick answer.

Regards,

Christian

> Le 19 nov. 2013 à 17:46, Brad Aagaard <baagaard at usgs.gov> a écrit :
> 
> Christian,
> 
> I follow the general idea of what you are describing but not all of the details. Imposing a slip rate is different than imposing a velocity on one side of the fault. When imposing a slip rate, the geometry, BC, and elastic properties will control how that slip rate is partitioned into the relative velocities on each side of the fault. If you question your results, you can try simpler geometries, BC, etc to build up your intuition and confidence that everything is setup the way you want it.
> 
> Regards,
> Brad
> 
> 
> 
>> On 11/19/2013 02:52 AM, Christian Baillard wrote:
>> Hi,
>> 
>> I'm in the 2d subduction case, on one the west side I impose 0 displacement for Mantle+Crust whether on the east side I impose 3.5 cm/yr for the crust (mantle fixed), see below.
>> 
>> # The creep rate and slip time are uniform, so use UniformDB for simplicity.
>> [pylithapp.timedependent.interfaces.fault_slabbot.eq_srcs.rupture.slip_function]
>> slip_rate = spatialdata.spatialdb.UniformDB
>> slip_rate.label = Slip rate
>> slip_rate.values = [left-lateral-slip, fault-opening]
>> slip_rate.data = [-3.5*cm/year, 0.0*cm/year]
>> 
>> When I check the velocities for the western bound of the crust I have velocities around 3 cm/year (the western bound is 250 km away from trench, I impose some locking patches for the subduction interface). Is that coherent to have this value of 3cm/yr instead of 3.5 cm/yr?
>> 
>> Best regards,
>> 
>> Christian
>> 
>> 
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