[GPlates-discuss] Help extracting plate size and trench age from GPlates model

[Simon Williams]

Hi Lior,

If you are happy to go down the python-coding route, there are some python notebooks that go through how to extract the properties you want (using the pygplates module):

For plate areas:
https://protect-au.mimecast.com/s/DeStCq7BKYt88EKJ1uZsMb7?domain=github.com

For age at trench
https://protect-au.mimecast.com/s/NuTGCr8DLRt88kP4ruzayoz?domain=github.com


You should be aware that:

- for the age at trench, you’ll need to have seafloor age grids that is consistent with whatever reconstruction you use.

- more generally, the Muller et al 2019 reconstruction is fairly unique in being a ‘deforming’ plate model, and pygplates does not (currently) properly support reconstructions with deforming regions. Many of the examples you’ll find online (including those linked above) will work with most other reconstructions that don’t include deforming regions (e.g. the reconstruction in the GPlates sample data), but not Muller et al 2019. If you are flexible with which global reconstruction to use, it would make things more straightforward to go with a ‘rigid’ topological model. If the use of Muller et al 2019 is non-negotiable, you’ll need to ignore the links above and find a different way that follows the same steps but without using pygplates, instead working on files that contain polygons and trench locations exported from the GPlates GUI.

Regards,
Simon



On 3 Mar 2020, at 2:30 am, Suchoy, Lior <l.suchoy17 at imperial.ac.uk<mailto:l.suchoy17 at imperial.ac.uk>> wrote:

Hello

As part of a project on upper mantle drag I am trying to extract several properties of plates from the Muller et al 2019 model of plate reconstruction. I managed to extract velocities using the kinematic tool. The other two properties which I am looking for are plate sizes (probably as plolygon surface area) and age at the trench (for subducting plates). I would be grateful for anyone who can assist me or point me to a good resource to complete this task.

Thank you,
Lior Suchoy | Research Postgraduate for Geodynamics
Earth Science and Engineering Dep., Imperial College London
Royal School of Mines, 4th floor, Desk 493/11, London, SW7 2BP
Email: L.suchoy17 at imperial.ac.uk<mailto:L.suchoy17 at imperial.ac.uk>    Mobile: +44 (0)74 00617085
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