Plate motion requests using the UNAVCO Plate Motion Calculator
release: Release v3.1.2
Prepare v3.1.2
dev: Update todo list



You can also use your local clone with git send-email.


A Julia package for plate motion data requests using the UNAVCO Plate Motion Calculator.

The package is open source, and the code is available under the Zero-Clause BSD license. There is also a website with online documentation.


From the Julia shell, switch to package mode with ] and run

add PlateMotionRequests

For advanced packaging instructions, refer to the Julia Pkg docs.


Save data whenever possible to avoid repeating requests to the UNAVCO server. Note that the provided methods do not implement any network limits.

julia> using PlateMotionRequests
julia> latitudes = -20:10:20
julia> longitudes = 160:10:200
julia> GSRMdata = platemotion(
           repeat(latitudes, length(longitudes)),
           repeat(longitudes, inner = length(latitudes)),

Data can be written to/read from storage using write_platemotion and read_platemotion. These functions write/read simple tab-delimited text files. By using the .nc file extension, you can tell write_platemotion to use an experimental NetCDF output format (NetCDF tests currently fail on Windows). To store binary representations, the Serialization module from Julia's standard library may prove useful. Other formats like HDF5 or ASDF may be preferred, depending on your requirements.

Responses are tabulated using TypedTables.jl, e.g.:

Table with 6 columns and 25 rows:
      lon    lat    velocity_east  velocity_north  plate_and_reference  model
 1  │ 160.0  -20.0  25.53          49.46           AU(NNR)              GSRM v2.1
 2  │ 160.0  -10.0  -61.14         25.72           PA(NNR)              GSRM v2.1
 3  │ 160.0  0.0    -65.81         25.72           PA(NNR)              GSRM v2.1
 4  │ 160.0  10.0   -68.49         25.72           PA(NNR)              GSRM v2.1
 5  │ 160.0  20.0   -69.1          25.71           PA(NNR)              GSRM v2.1
 6  │ 170.0  -20.0  -56.25         29.02           PA(NNR)              GSRM v2.1
 7  │ 170.0  -10.0  -61.97         29.02           PA(NNR)              GSRM v2.1
 8  │ 170.0  0.0    -65.81         29.03           PA(NNR)              GSRM v2.1
 9  │ 170.0  10.0   -67.66         29.02           PA(NNR)              GSRM v2.1
 10 │ 170.0  20.0   -67.48         29.02           PA(NNR)              GSRM v2.1
 11 │ 180.0  -20.0  20.45          35.23           AU(NNR)              GSRM v2.1
 12 │ 180.0  -10.0  -62.88         31.45           PA(NNR)              GSRM v2.1
 ⋮  │   ⋮      ⋮          ⋮              ⋮                  ⋮               ⋮

Change the model and reference frame using the model and reference keywords, respectively. For a no-net-rotation frame, use the value "NNR" (default). The model argument accepts the value "all", to query all available models for the data.

Change output formats using the format keyword. The supported output formats are "ascii" (default), "ascii_xyz" (WGS-84 coordinates) and "psvelo" (GMT 'psvelo' format).

For the full list of options, see ?platemotion. You may also want to refer to the UNAVCO website linked above.

The author is not affiliated with UNAVCO and cannot guarantee stability of the server.

#Feedback and contributions

Please use the public mailing list for feedback and discussion:


Contributions are handled via patches sent to the same mailing list (preferred) or pull requests at the GitHub mirror. Contributor guidelines are provided with the source code repository (in the file CONTRIBUTING.md). The file TODO.md lists some ideas for planned features. If you want to work on one of them, send an email first to check if an implementation is already underway.

CI is set up for commits pushed to main, next or dev. The CI manifests are in .build.yml and .github/workflows/ci.yml. Logs of test runs are available:

  • Linux CI (latest release) builds.sr.ht status
  • Windows CI (GitHub status