Thorsten W. Becker

Jackson School of Geosciences
The University of Texas at Austin

SA-RF APM


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downloads: [software] [tomography] [visualizations]
[global maps] [SKS compilation] [APM model] [LPO model]
[lecture notes] [papers]

Spreading-aligned, absolute plate motion reference frame

In Becker et al. (2015), we argue that optimizing the match of absolute plate motions to spreading orientations provides for an improved absolute plate motion (APM) reference frame that can satisfy a number of constraints, hotspot motions, and matches azimuthal anisotropy very well. Its net rotation amount is also broadly consistent with geodynamic estimates (e.g., Becker, 2006).

This new, spreading-aligned plate motion reference frame can be computed by adding a net rotation with Euler pole of 63.9E, 61.2S, 0.277 deg/Myr to a no-net-rotation (NNR) model. For our study, we used the NNR-MORVEL56 velocities of Argus et al. (2011).

Trench motions and slab rollback

Among the predictions of the new spreading-aligned APM model are a clearer separation of relative trench motions, as shown for Heuret et al. (2005) rollback/advance estimates in the new reference frame (blue = advancing, red = retreating trench wrt. subducting plate). Also see the discussion of reference frames for trench motions in Becker and Faccenna (2009).

Plate velocity model grids

For convenience, we here also provide global GMT/Netcdf .grd files with East and North velocities for the original velocities in NNR, and when moved into our spreading-aligned reference frame.

Original NNR version of NNR-MORVEL56 (Argus et al., 2011)

Spreading-aligned reference frame velocities of Becker et al. (2015)

References:

  • Argus, D. F., R. G. Gordon, and C. DeMets (2011), Geologically current motion of 56 plates relative to the no-net-rotation reference frame, Geochem. Geophys. Geosyst., 12, Q11001, doi:10.1029/2011GC003751.
  • Becker, T. W., Schaeffer, A. J., Lebedev, S., and Conrad, C. P.: Toward a generalized plate motion reference frame. Geophys. Res. Lett., 42, doi:10.1002/2015GL063695, 3188-3196, 2015. (PDF, supp. mat.)
  • Heuret, A., and S. Lallemand (2005), Slab dynamics and back-arc deformation, Phys. Earth Planet. Inter., 149, 31–51.

[news] [research] [teaching] [group] [publications] [CV] [contact]
downloads: [software] [tomography] [visualizations]
[global maps] [SKS compilation] [APM model] [LPO model]
[lecture notes] [papers]

Updated: December 13, 2018. (c) JSG Geodynamics, 2018.