The UNAVCO Global Data Ruler is a lenticular ruler which shifts images at it rotates and shows: the UNAVCO logo with on a natural color image of the Earth, GPS vectors indicating the plate motions, earthquakes around the world, and plate boundary strain rates.
The vector arrows are plate motion velocities determined from GPS data at selected IGS sites around the world in a "no-net-rotation" reference frame called ITRF2000.
This image shows of 40 years of NEIC earthquake hypocenters. The depth of the events is indicated by color:
green = shallow, magenta = very deep; see Jules Verne Voyager Earthquake Depth legend for more details.
The dataset shown in this image was created by the ILP Global Strain Rate Map edition of Jules Verne Voyager and is based on on the Global Strain Rate Map Project. It shows the "magnitude" of the lithospheric strain rate as the 2nd invariant of the model's strain rate tensor, demonstrating that the zone of deformation at plate boundaries can be quite broad. The colors indicate the magnitude of the strain rate:
magenta = very high strain rates
green = intermediate strain rates
blue = very low strain rates
(see Jules Verne Voyager Earth Ancillary Information legend for more details)
Last modified: Tuesday, 08-Dec-2015 22:58:13 UTC