[CIG-SHORT] Gravity, fault opening and fault tractions

[Brad Aagaard]

See TPV210 for an example using initial stresses consistent with 
gravitational body forces and a stress perturbation for nucleating 
rupture in a dynamic problem.

Note: I have not yet updated the CUBIT files and PyLith .cfg files in 
this benchmark to use the recent PyLith changes for buried faults.

Regards,
Brad


On 03/03/2015 06:43 PM, Ge Li, Mr wrote:
> Hi Brad,
> How are you? I have some questions about fault opening, gravity and its influences on fault tractions.
> Fault opening also occurs when I try to run a slip weakening slip on a conical fault. I  take your advice to some researchers that adding gravitational body forces to alleviate this phenomenon. After I add gravity field without consideration of initial stress and strain into benchmark example tpv205 and remove fault traction perturbation settings in original models, it seems that fault tractions are not affected by gravity and remain zero.
> I cannot figure out why, can you help me with that? Boundary conditions used are absorbing boundary conditions.
>
> Thanks
> Ge
>
> -----ÓʼþÔ­¼þ-----
> ·¢¼þÈË: Brad Aagaard [mailto:baagaard at usgs.gov]
> ·¢ËÍʱ¼ä: 2015Äê2ÔÂ4ÈÕ 10:59
> ÊÕ¼þÈË: Ge Li, Mr
> ³­ËÍ: cig-short at geodynamics.org
> Ö÷Ìâ: Re: Pylith adaptive time stepping
>
> Ge,
>
> Adaptive time stepping is currently implemented for viscoelastic bulk rheologies based on the relaxation time.
>
> See sections 4.2.4.3 and 5.1.4 of the PyLith manual for more information.
>
> Regards,
> Brad
>
> On 02/04/2015 07:18 AM, Ge Li, Mr wrote:
>> Hi Brad,
>>
>> I¡¯m a PhD student at McGill university. These days I¡¯m trying to use pylith to do dynamic  simulations of earthquake cycles on a Rate and state fault surface driven by remote creeping loading.
>> I have one questions about adaptive time stepping and hope you could help me with that.
>>
>>     1.  What¡¯s the algorithm of adaptive time stepping in pylith? Could you suggest me some papers about it?
>>
>> Any suggestions will be appreciated and Looking forward to your reply!
>>
>> Ge
>>
>