Table of Contents for GEON IDV web site Introducing the GEON IDV GEON IDV: Data Displays & Analysis Capabilities     GPS Velocity Vectors & Error Elipses     Earthquake Locations and Magnitude     Earthquake Focal Mechanisms     Seismic Anisotropy     Seismic Tomography     REM Global Seismic Tomography Data     Mantle Models' Tomography     Topography Data and 3D Relief Maps     Yellowstone Geophysics Example     Particle Plume Dispersion     Earth Strain Imagery     Seismic Ray Paths     GSRM Tectonic Plate Motion Vector Grids     Earth Strain Axes Download & Run the GEON IDV How to Use the GEON IDV: Basics     More Tips "True 3D" with the GEON IDV Data Online: The GEON Portal, and the UNAVCO Catalog GEON IDV Data Formats and Access Methods NetCDF Data for the GEON IDV UNAVCO's ASCII to NetCDF Data Converters

Obsolete Page

please see Global Strain Rate Map Project Data and Displays in the GEON IDV

Earth Strain images from gridded data in the GEON IDV july 16 2006

This page shows earth strain values on a lat-lon grid as a colored image in the GEON IDV. You can also show 2D grids as color-filled contours, pseudo-color images, data transects, and other ways.

You can combine such a display with maps, other geophysical data displays, maps, and GIS shape files. Any 2D lat-lon grids of values of any scalar parameter at a single depth or altitude can be shown the same way. You can choose color tables provided by the IDV, or modify or create color tables to fit you data. This is a powerful way to show gridded scalar values. Tailored color tables are ideal for showing features of interest. The GEON IDV includes the color table used here for strain.

The GSRM data was created and provided by Corne Kreemer and William Holt, Stony Brook. See Geophys J. Int. (2003) 154, 8-34; and online at http://geodesy.unr.edu/publications/Kreemer_et_al_GSRM_2003.pdf. The data are on regular grids; they are not randomly located observations such as earthquake locations, or station observations such as GPS motion vectors.

Get Data from the UNAVCO Server

The data shown here is on the UNAVCO GEON OPeNDAP server at http://geon.unavco.org/cgi-bin/opendap/nph-dods/data/gsrm/gsrm.nc You can connect to this data with the menu choice Data -> New Data Source -> From a Web Server.

Use an IDV Bundle File

To save the steps of accessing data and setting up the displays you can connect to the data and recreate the display shown below, in one step. including map and projection choices and color tables, using an IDV bundle file. Read more about IDV Bundle Files.

Load the IDV bundle file http://geon.unavco.org/unavco/XIDV/geon_grid_tectonics.xidv in the menu choice Data -> New Data Source -> From a Web Server. The GEON IDV reads the bundle file, connects to the data sources, reads the data, and makes the display with all settings included to match the image shown below.

This display also includes plate motion vectors on a grid, 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. Order of data load in the display may effect visibility (who is on top).

Make a Data File

The IDV reads data from NetCDF format files. See IDV Data Formats: NetCDF For an example of the kind of NetCDF CDL file of strain data see sample strain on 2D grid CDL file.

GSRM earth strain and tectonic plate motion (relative to Eurasian plate):