GRDGRADIENT

Mr Abhash Kumar <[email protected]>
Newsgroups gmane.comp.gis.gmt.user
Message-ID <f4bd5ffdf0d14c1ebe1272d2da0264cf@BY2PR03MB507.namprd03.prod.outlook.com> 
Hi,

I used grdgradient to calculate the strike of downdip direction at every grid point of the subducting slab:


grdgradient slabsurf2.grd -Dn -Sslabgradient.grd -M -V


I am getting the following results:


-69.9441860465  -17.0522875817  35.6361160278
-69.8697674419  -17.0522875817  36.5936279297
-69.7953488372  -17.0522875817  37.6132316589
-69.7209302326  -17.0522875817  38.6617622375
-69.6465116279  -17.0522875817  34.4591636658
-69.5720930233  -17.0522875817  31.943397522
-69.4976744186  -17.0522875817  31.6246490479
-69.423255814   -17.0522875817  30.8437995911


I roughly know that the strike of downdip direction should vary in the range of 30degree-120 degree in this region. Do I need to use some more functions to calculate the reasonable strike direction. I would be extremely grateful for any suggestions.


Thanks

Abhash kumar

University of North Carolina at Chapel Hill

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