From strimpel at gmail.com  Thu Sep  1 02:06:30 2016
From: strimpel at gmail.com (Oliver Strimpel)
Date: Wed, 31 Aug 2016 12:06:30 -0400
Subject: [GPlates-discuss] Problem viewing total reconstruction poles
In-Reply-To: <1E57973145EDFC41B1D69DE119239228017DFB6D6D@ex-mbx-pro-05>
References: <CAEKqtG7fBVZSaKJx=ZYVSDxzhdmnwaEtqikX9Hrk_jWTGTpW7A@mail.gmail.com>
	<146C1D79-392F-4AAA-87C6-32E83DEC1BA5@sydney.edu.au>
	<1E57973145EDFC41B1D69DE119239228017DFB6D6D@ex-mbx-pro-05>
Message-ID: <CAEKqtG6WQ1CDcsoa2d4a3eQZgkGg9t3H5O36Y+Fh8R+o_rpP7A@mail.gmail.com>

Thanks, John and Sabin.  Indeed, I did not have a rotation file loaded,
having mistaken the coastline file for the rotation file.  It's all working
properly now.

PS The tutorials are really helpful, and well designed.

On Tue, Aug 30, 2016 at 10:59 PM, John Cannon <john.cannon at sydney.edu.au>
wrote:

> Hi Oliver,
>
> Thanks Sabin. Yes the 'Show Reconstruction Tree Layer' in your screenshot
> is empty - which can happen when no rotation files are loaded.
>
>
> > Sam and Lena, would either of you be able to check that the
> instructions in this tutorial are clear? If not, please make changes as
> needed. Thanks so much!
>
>
> The first step says...
>
>
> 1. Make sure the rotation file (?Seton_etal_ESR2012_2012.1?) is loaded in
> GPlates.
>
> Regards,
> John
>
> ------------------------------
> *From:* GPlates-discuss [gplates-discuss-bounces at mailman.sydney.edu.au]
> on behalf of Sabin Zahirovic [sabin.zahirovic at sydney.edu.au]
> *Sent:* Wednesday, 31 August 2016 12:53 PM
> *To:* GPlates general discussion mailing list
> *Cc:* Samantha Ross; Lena O'toole
> *Subject:* Re: [GPlates-discuss] Problem viewing total reconstruction
> poles
>
> Hi Oliver,
>
>
>
> That window will only be populated if you have a rotation file loaded
> (.rot). You should be able to load it from the SampleData or from the
> Tutorial Dataset.
>
>
>
> Sam and Lena, would either of you be able to check that the instructions
> in this tutorial are clear? If not, please make changes as needed. Thanks
> so much!
>
>
>
> Cheers,
>
> Sabin
>
>
>
> *--    *
>
> *DR SABIN ZAHIROVIC | *Postdoctoral Research Associate
>
> School of Geosciences | Faculty of Science
>
>
>
>
>
>
>
> *THE UNIVERSITY OF SYDNEY*
>
> Rm 403, Madsen Building F09 | The University of Sydney | NSW | 2006
>
> *M* +61 416 775 589 *P* +61 2 9351 3625
>
> *E sabin.zahirovic at sydney.edu.au <sabin.zahirovic at sydney.edu.au>* | *W*
> *http://www.earthbyte.org* <http://www.earthbyte.org/>* |
> R http://www.researchgate.net/profile/Sabin_Zahirovic
> <http://www.researchgate.net/profile/Sabin_Zahirovic>*
>
> *F https://www.facebook.com/earthbyte <https://www.facebook.com/earthbyte>*
>  |* T https://twitter.com/EarthByteGroup
> <https://twitter.com/EarthByteGroup>*
>
> *Faculty contact for the Society of Exploration Geophysicists (SEG) -
> Member # 283117*
>
>
>
> Most recent publication:
>
>
>
> Zahirovic, S., N. Flament, R. D. M?ller, M. Seton, and M. Gurnis (In
> Press), Large fluctuations of shallow seas in low-lying Southeast Asia
> driven by mantle flow, *Geochemistry, Geophysics, Geosystems*
> <https://www.researchgate.net/publication/306088667_Large_fluctuations_of_shallow_seas_in_low-lying_Southeast_Asia_driven_by_mantle_flow>
> *,* doi: 10.1002/2016GC006434.
>
>
>
> CRICOS 00026A
>
> This email plus any attachments to it are confidential. Any unauthorised
> use is strictly prohibited. If you receive this email in error, please
> delete it and any attachments.
>
>
>
>
>
>
>
> *From: *GPlates-discuss <gplates-discuss-bounces at mailman.sydney.edu.au>
> on behalf of Oliver Strimpel <strimpel at gmail.com>
> *Reply-To: *GPlates general discussion mailing list <
> gplates-discuss at mailman.sydney.edu.au>
> *Date: *Wednesday, 31 August 2016 at 1:20 AM
> *To: *"gplates-discuss at mailman.sydney.edu.au" <gplates-discuss at mailman.
> sydney.edu.au>
> *Subject: *[GPlates-discuss] Problem viewing total reconstruction poles
>
>
>
> Hi,
>
>
>
> I am working through the GPlates Tutorials (on a Windows 7 machine).  In
> Tutorial 2.2, Exercise 3, one needs to select "View total Reconstruction
> Poles."  I have the Seton et al ESR2012 Coastlines file loaded, but nothing
> shows up in the window.
>
>
>
> [image: nline image 1]
>
>
>
> I'd be very grateful for suggestions on how to fix this.
>
>
>
> Thanks in advance,
>
> Oliver Strimpel
>
> _______________________________________________
> GPlates-discuss mailing list
> GPlates-discuss at mailman.sydney.edu.au
> http://mailman.sydney.edu.au/mailman/listinfo/gplates-discuss
>
>
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From christoph.vonhagke at emr.rwth-aachen.de  Mon Sep 19 17:48:47 2016
From: christoph.vonhagke at emr.rwth-aachen.de (Christoph v.Hagke)
Date: Mon, 19 Sep 2016 09:48:47 +0200
Subject: [GPlates-discuss] plotting relative plate velocities
In-Reply-To: <590a3b5f-cc23-ae03-abe9-40f9fc1a265e@rwth-aachen.de>
References: <590a3b5f-cc23-ae03-abe9-40f9fc1a265e@rwth-aachen.de>
Message-ID: <fd6adfcf-8591-d392-c749-c405a082d868@emr.rwth-aachen.de>

Hi all,

I used the Zahirovic et al. model to extract plate velocities. I tried 
to create plots with relative plate movements, and followed the 
instructions from the tutorial. It worked mostly well, however I came 
across a couple of points:

Here my first plot, it shows convergence of Arabia and Eurasia. (It's 
based on an India-Eurasia-Convergence plot Sabin was kind enough to 
share, and which I could reproduce, too)


Looks great, but has these two excursions at 27 & 16 Ma, which I find 
geologically difficult. Is this an artifact? How would you deal with it?

Second, I tried to do the same plot for Arabia and India. Unfortunately 
sth went wrong here, and in the .xy export files it shows the wrong 
plate IDs. I tried it several times, but don't get it to work. Any idea 
is appreciated. Thanks and cheers,

Christoph

-- 
Dr. Christoph von HAGKE
Assistant Professor

Institute of Structural Geology, Tectonics and Geomechanics
RWTH Aachen University, Lochnerstra?e 4-20, 52056 Aachen, Germany

Ph.: +49 241 80 98443


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From Christian.Heine at shell.com  Mon Sep 19 23:54:34 2016
From: Christian.Heine at shell.com (Christian.Heine at shell.com)
Date: Mon, 19 Sep 2016 13:54:34 +0000
Subject: [GPlates-discuss] plotting relative plate velocities
In-Reply-To: <fd6adfcf-8591-d392-c749-c405a082d868@emr.rwth-aachen.de>
References: <590a3b5f-cc23-ae03-abe9-40f9fc1a265e@rwth-aachen.de>
	<fd6adfcf-8591-d392-c749-c405a082d868@emr.rwth-aachen.de>
Message-ID: <79A2F7156CC1D441B593C58CF6BECAD9AE54C8D5@SEACMW-S-53401.europe.shell.com>

Christoph,

> I used the Zahirovic et al. model to extract plate velocities. I tried to
> create plots with relative plate movements, and followed the instructions
> from the tutorial.

This (https://docs.google.com/document/d/1xUHGu1N-nirc9t2srspdSOsmx0jrRsrBoJgWw5Ge0bI/pub) one?

[snip]

> Here my first plot, it shows convergence of Arabia and Eurasia. (It's
> based on an India-Eurasia-Convergence plot Sabin was kind enough to
> share, and which I could reproduce, too)

Attached my version which looks slightly similar but doesn't have the spikes at 27/16 Ma. This is for a point close to Kuweit.

> Looks great, but has these two excursions at 27 & 16 Ma, which I find
> geologically difficult. Is this an artifact? How would you deal with it?

You haven't mentioned whether you use a single point or the velocity domain points to achieve this. I think in the latter case, what could happen (and lead to the spikes) is if a plate boundary moves across your velocity domain point for a very short amount of time and you hence pick up velocities from a separate plate there. 

Depending on what you're trying to do it might be easier to digitise your points as 'standard' features and then use them for input for a new 'Calculated velocity fields' layer (simply add a new layer in the layer mgr) instead of the velocity domain points.

> Second, I tried to do the same plot for Arabia and India. Unfortunately
> sth went wrong here, and in the .xy export files it shows the wrong plate
> IDs. I tried it several times, but don't get it to work. Any idea is
> appreciated. Thanks and cheers,

Could be the same issue as above. Using the kinematics tool I can happily make vel magnitude vs time plots for ARA-IND. Try digitising a point and export vels from there.

HTH,
Christian


--
  Christian Heine, Ph.D.
  Upstream - Opportunity Identification (UPX/N/OH)
  Shell Intl. Exploration and Production B.V. 
  Carel van Bylandtlaan 5 | C05-01-B33
  2596 HP Den Haag, The Netherlands
 



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From sabin.zahirovic at sydney.edu.au  Tue Sep 20 13:22:28 2016
From: sabin.zahirovic at sydney.edu.au (Sabin Zahirovic)
Date: Tue, 20 Sep 2016 03:22:28 +0000
Subject: [GPlates-discuss] plotting relative plate velocities
In-Reply-To: <79A2F7156CC1D441B593C58CF6BECAD9AE54C8D5@SEACMW-S-53401.europe.shell.com>
References: <590a3b5f-cc23-ae03-abe9-40f9fc1a265e@rwth-aachen.de>
	<fd6adfcf-8591-d392-c749-c405a082d868@emr.rwth-aachen.de>
	<79A2F7156CC1D441B593C58CF6BECAD9AE54C8D5@SEACMW-S-53401.europe.shell.com>
Message-ID: <FF41B046-6E0E-40B8-9B99-7D73CF4E16EF@sydney.edu.au>

Hi Christoph and Christian,



Thanks for looking into this issue, and thanks for bringing it up.



Christoph, I found it a little difficult to reproduce exactly what you were doing, but I think I got there. I?ve got a few papers now that are associated with a specific plate reconstruction model, so Zahirovic et al. itself is not specific enough for me to figure out. I am assuming it?s our 2014 paper on Southeast Asia.



I used the kinematics tool in GPlates with the following setup (and loaded the 2014 rotation file):

[cid:image001.png at 01D21342.078C9A30]



Under settings:

[cid:image002.png at 01D21342.078C9A30]

(Make sure you click Apply, then Close).



I get something like this, which is similar to the trends you observe:

[cid:image003.png at 01D21342.078C9A30]



If I do the same, but load in our recent plate reconstructions (Muller et al., 2016, AREPS ? also attached), then I get something more geodynamically reasonable:

[cid:image004.png at 01D21342.078C9A30]



You can see the comparisons also in the CSV files that I attach. The differences are due to the rotations of Arabia relative to Africa, but more-so the rotations of Eurasia relative to North America, and then how that links back up to the absolute reference frame. We did detect that problem a while back, and we removed a few of the rotations. This usually happens when you have magnetic anomaly identifications that are very close temporally, which can introduce sudden changes in plate motion that are not geodynamically feasible. You can explore that in more detail in a paper by Iaffaldano et al. (2014)<http://onlinelibrary.wiley.com/doi/10.1002/2014GC005309/abstract>.



In our older models we have these rotations for Eurasia:

301 47.9   65.38  138.44  -10.96  101 !EUR-NAM Gaina et al. 2002

301 53.3   63.07  144.26  -12.82  101 !EUR-NAM Gaina et al. 2002

301 55.9   56.17  145.06  -13.24  101 !EUR-NAM Gaina et al. 2002

301 68.7   54.45  147.06  -15.86  101 !EUR-NAM Gaina et al. 2002



In our new models, we have these rotations for Eurasia (you can see the ~53 Ma rotation has been removed):

301 47.9   65.38  138.44  -10.96  101 !EUR-NAM @REF Gaina_++_2002 @DOI"10.1016/S0012-821X(02)00499-5" (21o)

301 55.9   56.17  145.06  -13.24  101 !EUR-NAM @REF Gaina_++_2002 @DOI"10.1016/S0012-821X(02)00499-5" (25y)

301 68.7   60.38  146.96  -16.33  101 !EUR-NAM @REF Barnett-Moore_++_(in review)



For Arabia, we had these rotations:

503  0.0    0.0    0.0    0.0  701 !ARB-AFR Arabia-Nubia (Africa)

503 10.9   26.1   23.1   -3.86  701 !ARB-AFR Royer et.al 1998

503 20.6   30.9   17.5   -6.32  701 !ARB-AFR Royer et.al 1998

503 600.0   30.9   17.5   -6.32  701 !ARB-AFR



Now Arabia?s motions are:

503  0.0    0.0    0.0    0.0  709 !ARA-SOM Arabia-Somalia

503  2.6   23.67   22.21   -0.939  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C2An.1y"

503  3.6   21.28   28.5   -1.619  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C2An.3o"

503  6.0   25.46   25.41   -2.398  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C3An.1y"

503  8.8   22.56   27.71   -3.985  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONIS"C4Ay"

503 11.0   23.88   26.66   -4.74  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C5n.2o"

503 16.0   25.85   25.4   -6.853  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C5Cn.1y"

503 17.5   26.1   22.98   -7.283  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C5Do"

503 19.7   26.46   21.66   -7.83  709 !ARA-SOM @REF Fournier_++_2010 @DOI"10.1029/2008JB006257", @CHRONID"C6no"

503 231.0   26.46   21.66   -7.83  709 !ARA-SOM



So the take-home message is that you should be using the latest plate reconstructions. The most recent model with evolving plate topologies is the AREPS Muller et al. (2016) model:

http://www.earthbyte.org/ocean-basin-evolution-and-global-scale-plate-reorganization-events-since-pangea-breakup/



A more recent model with some changes in the India-Eurasia and eastern Tethys region is here:

http://www.sciencedirect.com/science/article/pii/S0012825216302872



I recommend the AREPS model as it has the evolving plate topologies bundled, while in the other one we only provide the resolved topologies exported as GMT/SHP files. Hope that helps.



Cheers,

Sabin



--
DR SABIN ZAHIROVIC | Postdoctoral Research Associate
School of Geosciences | Faculty of Science


THE UNIVERSITY OF SYDNEY
Rm 403, Madsen Building F09 | The University of Sydney | NSW | 2006
M +61 416 775 589 P +61 2 9351 3625
E sabin.zahirovic at sydney.edu.au<mailto:sabin.zahirovic at sydney.edu.au> | W http://www.earthbyte.org<http://www.earthbyte.org/> | R http://www.researchgate.net/profile/Sabin_Zahirovic
F https://www.facebook.com/earthbyte | T https://twitter.com/EarthByteGroup
Faculty contact for the Society of Exploration Geophysicists (SEG) - Member # 283117

Most recent publications:

Zahirovic, S., Matthews, K.J., Flament, N., M?ller, R.D., Hill, K.C., Seton, M. and Gurnis, M., (In Press), Tectonic evolution and deep mantle structure of the eastern Tethys since the latest Jurassic, Earth Science Reviews<http://www.sciencedirect.com/science/article/pii/S0012825216302872>, doi: 10.1016/j.earscirev.2016.09.005.

Zahirovic, S., N. Flament, R. D. M?ller, M. Seton, and M. Gurnis (In Press), Large fluctuations of shallow seas in low-lying Southeast Asia driven by mantle flow, Geochemistry, Geophysics, Geosystems<https://www.researchgate.net/publication/306088667_Large_fluctuations_of_shallow_seas_in_low-lying_Southeast_Asia_driven_by_mantle_flow>, doi: 10.1002/2016GC006434.

CRICOS 00026A
This email plus any attachments to it are confidential. Any unauthorised use is strictly prohibited. If you receive this email in error, please delete it and any attachments.













On 19/09/2016, 11:54 PM, "GPlates-discuss on behalf of Christian.Heine at shell.com" <gplates-discuss-bounces at mailman.sydney.edu.au on behalf of Christian.Heine at shell.com> wrote:



    Christoph,



    > I used the Zahirovic et al. model to extract plate velocities. I tried to

    > create plots with relative plate movements, and followed the instructions

    > from the tutorial.



    This (https://docs.google.com/document/d/1xUHGu1N-nirc9t2srspdSOsmx0jrRsrBoJgWw5Ge0bI/pub) one?



    [snip]



    > Here my first plot, it shows convergence of Arabia and Eurasia. (It's

    > based on an India-Eurasia-Convergence plot Sabin was kind enough to

    > share, and which I could reproduce, too)



    Attached my version which looks slightly similar but doesn't have the spikes at 27/16 Ma. This is for a point close to Kuweit.



    > Looks great, but has these two excursions at 27 & 16 Ma, which I find

    > geologically difficult. Is this an artifact? How would you deal with it?



    You haven't mentioned whether you use a single point or the velocity domain points to achieve this. I think in the latter case, what could happen (and lead to the spikes) is if a plate boundary moves across your velocity domain point for a very short amount of time and you hence pick up velocities from a separate plate there.



    Depending on what you're trying to do it might be easier to digitise your points as 'standard' features and then use them for input for a new 'Calculated velocity fields' layer (simply add a new layer in the layer mgr) instead of the velocity domain points.



    > Second, I tried to do the same plot for Arabia and India. Unfortunately

    > sth went wrong here, and in the .xy export files it shows the wrong plate

    > IDs. I tried it several times, but don't get it to work. Any idea is

    > appreciated. Thanks and cheers,



    Could be the same issue as above. Using the kinematics tool I can happily make vel magnitude vs time plots for ARA-IND. Try digitising a point and export vels from there.



    HTH,

    Christian





    --

      Christian Heine, Ph.D.

      Upstream - Opportunity Identification (UPX/N/OH)

      Shell Intl. Exploration and Production B.V.

      Carel van Bylandtlaan 5 | C05-01-B33

      2596 HP Den Haag, The Netherlands










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From christoph.vonhagke at emr.rwth-aachen.de  Tue Sep 20 16:52:17 2016
From: christoph.vonhagke at emr.rwth-aachen.de (Christoph v.Hagke)
Date: Tue, 20 Sep 2016 08:52:17 +0200
Subject: [GPlates-discuss] plotting relative plate velocities
In-Reply-To: <FF41B046-6E0E-40B8-9B99-7D73CF4E16EF@sydney.edu.au>
References: <590a3b5f-cc23-ae03-abe9-40f9fc1a265e@rwth-aachen.de>
	<fd6adfcf-8591-d392-c749-c405a082d868@emr.rwth-aachen.de>
	<79A2F7156CC1D441B593C58CF6BECAD9AE54C8D5@SEACMW-S-53401.europe.shell.com>
	<FF41B046-6E0E-40B8-9B99-7D73CF4E16EF@sydney.edu.au>
Message-ID: <55f72caa-934a-8502-9fef-c827a57dc64a@emr.rwth-aachen.de>

Hi Christian and Sabin,

Thanks much! This really helps. All best,

Christoph



Am 20.09.2016 um 05:22 schrieb Sabin Zahirovic:
>
> Hi Christoph and Christian,
>
> Thanks for looking into this issue, and thanks for bringing it up.
>
> Christoph, I found it a little difficult to reproduce exactly what you 
> were doing, but I think I got there. I?ve got a few papers now that 
> are associated with a specific plate reconstruction model, so 
> Zahirovic et al. itself is not specific enough for me to figure out. I 
> am assuming it?s our 2014 paper on Southeast Asia.
>
> I used the kinematics tool in GPlates with the following setup (and 
> loaded the 2014 rotation file):
>
> Under settings:
>
> (Make sure you click Apply, then Close).
>
> I get something like this, which is similar to the trends you observe:
>
> If I do the same, but load in our recent plate reconstructions (Muller 
> et al., 2016, AREPS ? also attached), then I get something more 
> geodynamically reasonable:
>
> You can see the comparisons also in the CSV files that I attach. The 
> differences are due to the rotations of Arabia relative to Africa, but 
> more-so the rotations of Eurasia relative to North America, and then 
> how that links back up to the absolute reference frame. We did detect 
> that problem a while back, and we removed a few of the rotations. This 
> usually happens when you have magnetic anomaly identifications that 
> are very close temporally, which can introduce sudden changes in plate 
> motion that are not geodynamically feasible. You can explore that in 
> more detail in a paper by Iaffaldano et al. (2014) 
> <http://onlinelibrary.wiley.com/doi/10.1002/2014GC005309/abstract>.
>
> In our older models we have these rotations for Eurasia:
>
> 301 47.9   65.38  138.44  -10.96  101 !EUR-NAM Gaina et al. 2002
>
> 301 53.3   63.07  144.26  -12.82  101 !EUR-NAM Gaina et al. 2002
>
> 301 55.9   56.17  145.06  -13.24  101 !EUR-NAM Gaina et al. 2002
>
> 301 68.7   54.45  147.06  -15.86  101 !EUR-NAM Gaina et al. 2002
>
> In our new models, we have these rotations for Eurasia (you can see 
> the ~53 Ma rotation has been removed):
>
> 301 47.9   65.38  138.44  -10.96  101 !EUR-NAM @REF Gaina_++_2002 
> @DOI"10.1016/S0012-821X(02)00499-5" (21o)
>
> 301 55.9   56.17  145.06  -13.24  101 !EUR-NAM @REF Gaina_++_2002 
> @DOI"10.1016/S0012-821X(02)00499-5" (25y)
>
> 301 68.7   60.38  146.96  -16.33  101 !EUR-NAM @REF 
> Barnett-Moore_++_(in review)
>
> For Arabia, we had these rotations:
>
> 503  0.0    0.0    0.0    0.0  701 !ARB-AFR Arabia-Nubia (Africa)
>
> 503 10.9   26.1   23.1   -3.86  701 !ARB-AFR Royer et.al 1998
>
> 503 20.6   30.9   17.5   -6.32  701 !ARB-AFR Royer et.al 1998
>
> 503 600.0   30.9   17.5   -6.32  701 !ARB-AFR
>
> Now Arabia?s motions are:
>
> 503  0.0    0.0    0.0    0.0  709 !ARA-SOM Arabia-Somalia
>
> 503  2.6   23.67   22.21   -0.939  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C2An.1y"
>
> 503  3.6   21.28   28.5   -1.619  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C2An.3o"
>
> 503  6.0   25.46   25.41   -2.398  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C3An.1y"
>
> 503  8.8   22.56   27.71   -3.985  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONIS"C4Ay"
>
> 503 11.0   23.88   26.66   -4.74  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C5n.2o"
>
> 503 16.0   25.85   25.4   -6.853  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C5Cn.1y"
>
> 503 17.5   26.1   22.98   -7.283  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C5Do"
>
> 503 19.7   26.46   21.66   -7.83  709 !ARA-SOM @REF Fournier_++_2010 
> @DOI"10.1029/2008JB006257", @CHRONID"C6no"
>
> 503 231.0   26.46   21.66   -7.83  709 !ARA-SOM
>
> So the take-home message is that you should be using the latest plate 
> reconstructions. The most recent model with evolving plate topologies 
> is the AREPS Muller et al. (2016) model:
>
> http://www.earthbyte.org/ocean-basin-evolution-and-global-scale-plate-reorganization-events-since-pangea-breakup/
>
> A more recent model with some changes in the India-Eurasia and eastern 
> Tethys region is here:
>
> http://www.sciencedirect.com/science/article/pii/S0012825216302872
>
> I recommend the AREPS model as it has the evolving plate topologies 
> bundled, while in the other one we only provide the resolved 
> topologies exported as GMT/SHP files. Hope that helps.
>
> Cheers,
>
> Sabin
>
> *-- *
>
> *DR SABIN ZAHIROVIC | *Postdoctoral Research Associate
>
> School of Geosciences | Faculty of Science
>
> **
>
> **
>
> *THE UNIVERSITY OF SYDNEY*
>
> Rm 403, Madsen Building F09 | The University of Sydney | NSW | 2006
>
> *M* +61 416 775 589 *P* +61 2 9351 3625
>
> *E sabin.zahirovic at sydney.edu.au 
> <mailto:sabin.zahirovic at sydney.edu.au>***| *W* 
> *http://www.earthbyte.org* <http://www.earthbyte.org/>*| R 
> http://www.researchgate.net/profile/Sabin_Zahirovic*
>
> *F https://www.facebook.com/earthbyte***|* T 
> https://twitter.com/EarthByteGroup*
>
> *Faculty contact for the Society of Exploration Geophysicists (SEG) - 
> Member # 283117*
>
> **
>
> Most recent publications:
>
> Zahirovic, S., Matthews, K.J., Flament, N., M?ller, R.D., Hill, K.C., 
> Seton, M. and Gurnis, M., (In Press), Tectonic evolution and deep 
> mantle structure of the eastern Tethys since the latest Jurassic, 
> /Earth Science Reviews 
> <http://www.sciencedirect.com/science/article/pii/S0012825216302872>/, 
> doi: 10.1016/j.earscirev.2016.09.005.
>
> Zahirovic, S., N. Flament, R. D. M?ller, M. Seton, and M. Gurnis (In 
> Press), Large fluctuations of shallow seas in low-lying Southeast Asia 
> driven by mantle flow, /Geochemistry, Geophysics, Geosystems/ 
> <https://www.researchgate.net/publication/306088667_Large_fluctuations_of_shallow_seas_in_low-lying_Southeast_Asia_driven_by_mantle_flow>/,/ doi: 
> 10.1002/2016GC006434.
>
> CRICOS 00026A
>
> This email plus any attachments to it are confidential. Any 
> unauthorised use is strictly prohibited. If you receive this email in 
> error, please delete it and any attachments.
>
> On 19/09/2016, 11:54 PM, "GPlates-discuss on behalf of 
> Christian.Heine at shell.com" 
> <gplates-discuss-bounces at mailman.sydney.edu.au on behalf of 
> Christian.Heine at shell.com> wrote:
>
>     Christoph,
>
>     > I used the Zahirovic et al. model to extract plate velocities. I 
> tried to
>
>     > create plots with relative plate movements, and followed the 
> instructions
>
>     > from the tutorial.
>
>     This 
> (https://docs.google.com/document/d/1xUHGu1N-nirc9t2srspdSOsmx0jrRsrBoJgWw5Ge0bI/pub) 
> one?
>
>     [snip]
>
>     > Here my first plot, it shows convergence of Arabia and Eurasia. 
> (It's
>
>     > based on an India-Eurasia-Convergence plot Sabin was kind enough to
>
>     > share, and which I could reproduce, too)
>
>     Attached my version which looks slightly similar but doesn't have 
> the spikes at 27/16 Ma. This is for a point close to Kuweit.
>
>     > Looks great, but has these two excursions at 27 & 16 Ma, which I 
> find
>
>     > geologically difficult. Is this an artifact? How would you deal 
> with it?
>
>     You haven't mentioned whether you use a single point or the 
> velocity domain points to achieve this. I think in the latter case, 
> what could happen (and lead to the spikes) is if a plate boundary 
> moves across your velocity domain point for a very short amount of 
> time and you hence pick up velocities from a separate plate there.
>
>     Depending on what you're trying to do it might be easier to 
> digitise your points as 'standard' features and then use them for 
> input for a new 'Calculated velocity fields' layer (simply add a new 
> layer in the layer mgr) instead of the velocity domain points.
>
>     > Second, I tried to do the same plot for Arabia and India. 
> Unfortunately
>
>     > sth went wrong here, and in the .xy export files it shows the 
> wrong plate
>
>     > IDs. I tried it several times, but don't get it to work. Any idea is
>
>     > appreciated. Thanks and cheers,
>
>     Could be the same issue as above. Using the kinematics tool I can 
> happily make vel magnitude vs time plots for ARA-IND. Try digitising a 
> point and export vels from there.
>
>     HTH,
>
>     Christian
>
>     --
>
>       Christian Heine, Ph.D.
>
>       Upstream - Opportunity Identification (UPX/N/OH)
>
>       Shell Intl. Exploration and Production B.V.
>
>       Carel van Bylandtlaan 5 | C05-01-B33
>
>       2596 HP Den Haag, The Netherlands
>
>
>
> _______________________________________________
> GPlates-discuss mailing list
> GPlates-discuss at mailman.sydney.edu.au
> http://mailman.sydney.edu.au/mailman/listinfo/gplates-discuss


-- 
Dr. Christoph von HAGKE
Assistant Professor

Institute of Structural Geology, Tectonics and Geomechanics
RWTH Aachen University, Lochnerstra?e 4-20, 52056 Aachen, Germany

Ph.: +49 241 80 98443

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From claudiocasciano at gmail.com  Thu Sep 22 00:32:28 2016
From: claudiocasciano at gmail.com (Claudio Ivan Casciano)
Date: Wed, 21 Sep 2016 16:32:28 +0200
Subject: [GPlates-discuss] relative plate velocities
Message-ID: <CAM7G-FWsxPZC6BEXs26Y=y6zNmWFkrOuOkpY-=puPL_e=JQQRQ@mail.gmail.com>

Hi all,
I?m working with GPlates on plate reconstructions in the European reference
frame (reconstruction >>> specify anchored plate Id >>> 301). I would like
to visualize in the same project the relative velocity vectors between
different pairs of plates.  For example, I created the Mid Atlantic Ridge,
a synthetic Iberia ? Eurasia plate boundary and the associated calculated
velocity fields but I don?t know how to visualize together on the screen,
at the same time, the Iberia ? North America and Iberia ? Eurasia velocity
vectors. Is it possible?

Thank you for your help

cheers
Claudio
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From john.cannon at sydney.edu.au  Thu Sep 22 13:52:17 2016
From: john.cannon at sydney.edu.au (John Cannon)
Date: Thu, 22 Sep 2016 03:52:17 +0000
Subject: [GPlates-discuss] relative plate velocities
In-Reply-To: <CAM7G-FWsxPZC6BEXs26Y=y6zNmWFkrOuOkpY-=puPL_e=JQQRQ@mail.gmail.com>
References: <CAM7G-FWsxPZC6BEXs26Y=y6zNmWFkrOuOkpY-=puPL_e=JQQRQ@mail.gmail.com>
Message-ID: <1E57973145EDFC41B1D69DE1192392280184A6503D@ex-mbx-pro-05>

Hi Claudio,

I don't think that's possible since I believe it would require two different anchored plates. Visualising velocities relative to a plate requires that particular plate be set as the anchored plate (so two relative velocities needs two anchored plates).

Regards,
John

________________________________
From: GPlates-discuss [gplates-discuss-bounces at mailman.sydney.edu.au] on behalf of Claudio Ivan Casciano [claudiocasciano at gmail.com]
Sent: Thursday, 22 September 2016 12:32 AM
To: gplates-discuss at mailman.sydney.edu.au
Subject: [GPlates-discuss] relative plate velocities

Hi all,
I?m working with GPlates on plate reconstructions in the European reference frame (reconstruction >>> specify anchored plate Id >>> 301). I would like to visualize in the same project the relative velocity vectors between different pairs of plates.  For example, I created the Mid Atlantic Ridge, a synthetic Iberia ? Eurasia plate boundary and the associated calculated velocity fields but I don?t know how to visualize together on the screen, at the same time, the Iberia ? North America and Iberia ? Eurasia velocity vectors. Is it possible?

Thank you for your help

cheers
Claudio
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From christoph.von.hagke at rwth-aachen.de  Fri Sep 30 22:29:41 2016
From: christoph.von.hagke at rwth-aachen.de (Christoph von Hagke)
Date: Fri, 30 Sep 2016 14:29:41 +0200
Subject: [GPlates-discuss] plotting plate convergence / divergence
Message-ID: <7f59c274-81a6-6dc9-4d2d-c62593057f8f@rwth-aachen.de>

Hi all,

I was wondering if in addition to plotting relative motion paths, it 
would be possible to plot relative convergence & divergence of two 
selected plates. I imagine sth where convergence is positive, and 
divergence is negative, as opposed to the always positive motion paths. 
Unfortunately I did not find it in the tutorials. Any idea is greatly 
appreciated. Thanks,

Christoph


-- 
Dr. Christoph von HAGKE
Assistant Professor

Institute of Structural Geology, Tectonics and Geomechanics
RWTH Aachen University, Lochnerstra?e 4-20, 52056 Aachen, Germany

Ph.: +49 241 80 98443

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