Applications to regional networks PANGA Meghan Miller CWU

Applications to regional networks: PANGA Meghan Miller CWU

Casting PANGA velocities: • Working assumptions: – ITRF 2000 is the point of entry – Stabilize to a regionally meaningful reference frame – To get at North America, GPS definition internal to solution is needed – Use topography as proxy for deformation (cf Sella’s stable plate) • Pragmatic considerations: – What stations are available during a given time interval – Trade offs between quality and quantity of time series – Non-linearity of time series • • • Correlated noise Episodic events Other events – Evolution of analysis strategy – Imperfect error models – Ignore post-glacial effects( and other non-rigid plate effects) – Until recently, the length/quality of time series and our ability to manipulate the time series has been the first order control on uncertainty

Casting PANGA velocities: • Approach: – Analysis of sub-networks with ambiguity resolved, JPL fiducial free products and daily frame files – Combination by common subset of stations – Daily solutions stabilized to a set of 42 stations (regional and NA) – Annual and semi-annual effects removed on case-by-case basis – Velocity solution derived from this for T>2. 3 – Rotation to North America zero motion explicitly solved for each solution • Results: – A stable, internally consistent frame approaching tenths of mm resolution – Useful to regional tectonics – Lots of compromises

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