GSRM 2nd invariant of strain rate and plate velocity vectors; click for large view

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Global Strain Rate Map (GSRM) Data and Displays in the GEON IDV

"In 1998 the International Lithosphere Program (ILP) initiated a new project: 'A Global Strain Rate Map' (ILP II-8). The mission of the Global Strain Rate Map (GSRM) project is to determine a globally self-consistent strain rate and velocity field model, consistent with geodetic and geologic field observations. " (from GSRM Introduction).

GSRM Data Sources for the GEON IDV:

NetCDF files for IDV use:

global grid of second invariant strain rate: http://geon.unavco.org/unavco/globe/gsrm.nc (netcdf variable name is "sisr")

global grid of Strain Rate on 0.6°x0.5° mesh spaing (Not available yet): http://geon.unavco.org/unavco/globe/gsrm_strain.nc
variables are exx eyy exy var(exx) var(eyy) var(exy) cc_xx_yy cc_xx_xy cc_yy_xy

Enter these URL link locations into the IDV Data Chooser URLs window.

global plate velocities: see Today's Plate Motion Vectors (GSRM Plate Velocities)

GSRM Publications:

Kreemer, C, A.J. Haines, W.E. Holt, G. Blewitt, and D. Lavalée,"On the determination of a globa strain rate model, Earth Planets Space, 52, 765-770, 2000; ( pdf copy online)

Kreemer, C., and W.E. Holt, A no-net-rotation model of present-day surface motions, Geophys. Res. Lett., 28, 4407-4410, 2001.

Kreemer, C., W.E. Holt, and A.J. Haines, The global moment rate distribution within plate boundary zones, in Plate Boundary Zones, eds. S. Stein and J.T. Freymueller, Geodynamics Series, v.30, 10/1029/030GD10, AGU, Washington D.C., 2002.

Kreemer, C., W.E. Holt, and A.J. Haines, "An integrated global model of present-day plate motions and plate boundary deformation," Geophys. J. Int., 154, 8-34, 2003. (pdf copy online)

GSRM Data Source Web Site:

Global Strain Rate Map Project (http://gsrm.unavco.org/),
Global Strain Rate Map : Results for version 1.2 (http://geodesy.unr.edu/cornekreemer/gsrm.htm)

GSRM Model Results online: Global Strain Rate Map Project: Model Results

Bundle File:

Data for GSRM Strain (second invariant strain rate) by Kreemer, C, A.J. Haines, W.E. Holt, G. Blewitt, and D. Lavalé, and plate motions vectors relative to Europe can be seen with the bundle file http://geon.unavco.org/unavco/XIDV/GSRM_GEON_IDV_demo.xidv. Simply add the url of a bundle file to the IDV "Dashboard" window, Data Choosers panel, URLs entry box, click "Add source," and the display should be made.

You will make a display like

This display also includes GSRM plate motion vectors, relative to the Eurasian plate. The earth strain image is transparent where data value is 0, allowing other data and map lines to be easily seen to be seen.

GSRM 2nd invariant of strain rate and plate velocity vectors; click for large view

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IDV Computations

The IDV includes computations, such as finding the horizontal divergence of a vector field.

see "Computing Plate Divergence from GSRM Velocities and the Lithgow-Bertelloni & Richards Historic Plate Motions with the GEON IDV"

GEON IDV globe view of 'horizontal divergence' of the GSRM 'no net rotation' velocity field, Americas. Red and orange areas are positive divergence (crustal extension or spreading), and blue areas are negative divergence, crustal contraction or subduction. Note that divergence is not the same as the second invariant of strain rate.

bundle file for the above display