[GPlates-discuss] The velocity field extracted from Matthews 2016?

[John Cannon]

Hi Nan,

The problem is likely that there's two rotation files in the Matthews et al., 2016 data ( https://www.earthbyte.org/global-plate-models/ ), but only the 410-250Ma rotation file is being used  (see attached image which shows two yellow rotation layers with the top layer the default and the second layer, containing the 250-0Ma rotations, is unused).

To solve this you can merge the two rotation layers into one (see red outline red in attached image). Now there will only be one yellow rotation layer (containing all rotations from 410-0Ma) and the velocities arrows will reappear.

There is an explanation in the "README.txt" file in the Matthews et al., 2016 data (search for "The two rotation files need to be 'connected' in order for the model to run continuously from 410 to 0 Ma"). It describes the older (GPlates 1.5) method of merging. However the new method covered above is easier (in GPlates 2.0).

Regards,
John


From: GPlates-discuss [mailto:gplates-discuss-bounces at mailman.sydney.edu.au] On Behalf Of Nan Zhang
Sent: Friday, 3 March 2017 3:58 PM
To: gplates-discuss at mailman.sydney.edu.au
Cc: Zheng-Xiang Li; Sergei Pisarevskiy
Subject: [GPlates-discuss] The velocity field extracted from Matthews 2016?

Hi all,

I am outputting the CitcomS velocity files from the GPlates. I used Matthews et al., 2016 data, following "Open feature collection"-->"Features, generate velocity domain points: citcoms (9x9)"-->"Reconstruction:export". However, the bvel.*.* files I got show none of velocity field.  I noticed that the velocity plotting after "Features, generate velocity domain points: citcoms" shows no velocity vectors as my first attached jpg file.

I tried a comparison with Muller et al., 2016 data. I can get the plotting of velocity vectors as well as good bvel.*.* files (attached 2nd jpg file). I wonder if I did not operate correct for the data of Matthews 2016, or it is problematic?

Thanks!
Nan Zhang
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