[CIG-SHORT] slip orientation for a nonplanar fault surface

[Jiangzhi Chen]

Great, thanks for the help.
On 10/20/2014 03:57 PM, Brad Aagaard wrote:
> On 10/20/2014 03:55 PM, Jiangzhi Chen wrote:
>> Oh I understand what you mean, since the strain is not finite, the
>> deformation should not change the slip direction great enough, so the
>> prescribed slip should work.
>
> Correct.
>
> Regards,
> Brad
>
>> On 10/20/2014 03:50 PM, Brad Aagaard wrote:
>>> Jiangzhi,
>>>
>>> I don't understand why you think prescribed slip won't work for a
>>> kinematic fault interface?
>>>
>>> Regards,
>>> Brad
>>>
>>>
>>> On 10/20/2014 03:44 PM, Jiangzhi Chen wrote:
>>>> The time scale is several hundreds of years, about one earthquake 
>>>> cycle.
>>>>
>>>> On 10/20/2014 03:34 PM, Brad Aagaard wrote:
>>>>> Jiangzhi,
>>>>>
>>>>> What time scale are you modeling? PyLith should be appropriate if the
>>>>> problem can be solved with infinitesimal or small strains.
>>>>> Additionally, the fault formulation in PyLith breaks down when the
>>>>> offset become large enough so that the slip vector would need to be
>>>>> changing. We expect that a finite-strain formulation would be needed
>>>>> as well for those types of problems.
>>>>>
>>>>> Regards,
>>>>> Brad
>>>>>
>>>>> On 10/20/2014 03:24 PM, Jiangzhi Chen wrote:
>>>>>> Thanks for the quick response. The region is part of the Cascadia
>>>>>> subduction zone, where the Juan de Fuca plate moves northeastward 
>>>>>> and
>>>>>> subducts. The aim is to understand how the subduction influences the
>>>>>> surface displacement field, and explains the geodetic 
>>>>>> observation. The
>>>>>> upper slab interface is supposed to be a dynamic fault surface, and
>>>>>> the
>>>>>> lower interface is a kinematic surface. For now, I am using two
>>>>>> kinematic surface just to make the slab go under.
>>>>>>
>>>>>> Jiangzhi
>>>>>>
>>>>>> On 10/20/2014 03:08 PM, Brad Aagaard wrote:
>>>>>>> Jiangzhi,
>>>>>>>
>>>>>>> I don't understand what you are trying to do. What research 
>>>>>>> question
>>>>>>> are you trying to answer? What do you want to learn from the
>>>>>>> simulation?
>>>>>>> What are your observations/constraints?
>>>>>>>
>>>>>>> Regards,
>>>>>>> Brad
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 10/20/2014 03:02 PM, Jiangzhi Chen wrote:
>>>>>>>> Hi everyone,
>>>>>>>>
>>>>>>>>      I am working on a subduction simulation, where the fault
>>>>>>>> interface
>>>>>>>> is nonplanar, and the subduction slab moves in northeast direction
>>>>>>>> at 4
>>>>>>>> cm/year before it meets the overriding plate. My question is how
>>>>>>>> I can
>>>>>>>> specify the kinematic fault interface. It is not appropriate to 
>>>>>>>> use
>>>>>>>> predefined slip functions, because the slip rates depend on the
>>>>>>>> location
>>>>>>>> which is changing with time. Is there a way to make this work? Any
>>>>>>>> help
>>>>>>>> is appreciated.
>>>>>>>>
>>>>>>>> cheers,
>>>>>>>> Jiangzhi
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
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