Global Strain Rate Map Project: Rotated Geodetic Vectors
Please give proper credit to results
Caveat Emptor!
The GPS geodetic vectors that you will be downloading below have been rotated from
the original study's reference frame into a bestfit model reference frame in the GSRM
model. That is, in the process of seeking a single selfconsistent model velocity
field we solve for a rigid body rotation, for each study, that places the GPS
vectors into optimal alignment with the model velocity field. The rotation
applied to each study can be found in the accompanying GSRM file
rotation_vector_studies_PA.dat.
If you are interested in the original data in the original form (original frame of
reference), then please refer to the published studies of the
geodetic references.
The rigid body rotation added to each data set does not affect the relative motions
between points within each data set, which define the strain rates. However, the
relative motions between different studies (since this is defined by the frame
of reference) may have been altered. For example, study A and study B may both
be within a Eurasian reference frame, but due to differences in how that frame
was realized, there may be inconsistencies at colocated sites. In the GSRM
model rigid body rotations would be applied to both study A and B to place them
into a bestfit single frame, which is a model result from this GSRM study. This
model result may or may not improve the estimate of the original reference
frame. This caveat is provided so that users will not confuse the vectors with the
original vectors published or presented in the original papers. That is, the
vectors you will be downloading are the original vectors plus an added rigid body
rotation to those vectors.
Rotated GPS Geodetic Vectors by Reference Frame:
in GMT psvelo format (all files are about 0.3 Mb, or 7580 kb compressed)
Comments or questions about this page? Send mail to Bill Holt.
(william.holtsunysb.edu or
wholtnotes.cc.sunysb.edu)
