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

[Brad Aagaard]

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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