[CIG-SHORT] updip shear direction

[Brad Aagaard]

Teng,

We use seismological conventions to define the sign. Reverse slip is 
positive and normal slip is negative.

Brad


On 4/11/17 8:06 PM, Li, Teng wrote:
> Hi Brad,
> Please see the attachment. Actually, I seek some answers. As we can see in the attached picture, is this right that updip direction can be either clockwise or counter-clockwise which depends on different fault tilt angle?
> The reason I pay attention to clockwise or counter-clockwise is that in Mohr circle, shear convention is clockwise or counterclockwise. If the updip direction can be either clockwise or counter-clockwise, then I can not be sure to apply positive value or negative value.
>
> Thanks
>
>
> Teng Li
>
> Master Candidate in Structures
>
> Department of Civil and Environmental Engineering
>
> University of Illinois at Urbana-Champaign
>
> 205 North Mathews Ave, Urbana, IL. 61801
>
> Phone:(217)8196210, Email: tengli2 at illinois.edu
>
>
>
> ________________________________________
> From: CIG-SHORT [cig-short-bounces at geodynamics.org] on behalf of Brad Aagaard [baagaard at usgs.gov]
> Sent: Tuesday, April 11, 2017 9:51 PM
> To: cig-short at geodynamics.org
> Subject: Re: [CIG-SHORT] updip shear direction
>
> Teng,
>
> See Figure 6.2 on page 91 (119 of 268) in the PyLith v2.2.0 manual.
> Please make a conscientious effort to seek answers to questions by
> reading the manual before sending email to cig-short.
>
> Thanks,
> Brad
>
>
> On 4/11/17 7:31 PM, Li, Teng wrote:
>> Hi,
>> I have a simple question.
>> What is the updip direction? I need to apply positive shear direction in
>> a fault. Thanks
>> Teng Li
>>
>> Teng Li
>>
>> Master Candidate in Structures
>>
>> Department of Civil and Environmental Engineering
>>
>> University of Illinois at Urbana-Champaign
>>
>> 205 North Mathews Ave, Urbana, IL. 61801
>>
>> Phone:(217)8196210, Email: tengli2 at illinois.edu
>>
>>
>>
>>
>>
>> _______________________________________________
>> CIG-SHORT mailing list
>> CIG-SHORT at geodynamics.org
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>>
>
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