[CIG-SHORT] trivial question

[Roby Douilly]

Brad, 

Oh yes it was a typo. I meant one dipping north and the other one dipping south. 

> The fault normal direction is picked by how we insert the cohesive cells. As a result we don't know which direction of the two possible directions it will point. We pick the dip and along-strike directions to give the correct sense of motion (positive left lateral and positive reverse)

That is how I understand it too but if you look at the screen shot below, the unit normal direction and the unit strike direction is the same for the both faults, I can't understand why the unit dip direction point on the opposite direction. The north dipping fault is pointing on the negative reverse side. Am I correct? 

Roby





On Jan 30, 2013, at 12:42 PM, Brad Aagaard wrote:

> Roby,
> 
> Do you really mean both faults dip south or one dips south and the other dips north?
> 
> The fault normal direction is picked by how we insert the cohesive cells. As a result we don't know which direction of the two possible directions it will point. We pick the dip and along-strike directions to give the correct sense of motion (positive left lateral and positive reverse). This means you need to examine all three directions to check the fault orientation. If you want to plot the slip and/or traction vectors on the hanging wall, then you might need to flip the signs of the slip and tractions so that they are plotted for the hanging wall (one possible fault normal direction) and not the footwall (the other possible fault normal direction).
> 
> Regards,
> Brad
> 
> On 1/29/13 10:46 PM, Roby Douilly wrote:
>> Hi Brad,
>> 
>> I have two faults, one dipping south and the other one dipping south. In
>> paraview, I output the dip_dir for both of them. For the south dipping
>> fault the dip_dir is upward but for the north dipping fault the dip_dir
>> is downward. Is it suppose to be like that? For the normal_dir and
>> strike_dir it is the same but the difference is only for the dip_dir.
>> 
>> 
>> Roby
>> 
>> ---------------------------------------------------------------------------------
>> Roby Douilly
>> Graduate Student
>> Department of Earth, Atmospheric, and Planetary Sciences
>> Purdue University
>> 550 Stadium Mall Dr.
>> West Lafayette, IN 47907-2051
>> rdouilly at purdue.edu <mailto:rdouilly at purdue.edu>
>> 
>> 
>> 
>> 
> 



Roby

---------------------------------------------------------------------------------
Roby Douilly
Graduate Student 
Department of Earth, Atmospheric, and Planetary Sciences
Purdue University
550 Stadium Mall Dr.
West Lafayette, IN 47907-2051
rdouilly at purdue.edu




-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://geodynamics.org/pipermail/cig-short/attachments/20130130/76541d5a/attachment-0001.htm 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dip_dir.png
Type: image/png
Size: 63541 bytes
Desc: not available
Url : http://geodynamics.org/pipermail/cig-short/attachments/20130130/76541d5a/attachment-0003.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: normal_dir.png
Type: image/png
Size: 37319 bytes
Desc: not available
Url : http://geodynamics.org/pipermail/cig-short/attachments/20130130/76541d5a/attachment-0004.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: strike_dir.png
Type: image/png
Size: 57526 bytes
Desc: not available
Url : http://geodynamics.org/pipermail/cig-short/attachments/20130130/76541d5a/attachment-0005.png