Tom Herring, MIT; Jim Davis, SAO SNARF Presentation Tom Herring, MIT; Jim Davis, SAO 4/6/2019 SNARF May 04

Outline More views of the fits to the GIA models Nature of the GIA models 4/6/2019 SNARF May 04

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Difference in structure due to site selection mainly 4/6/2019 SNARF May 04

Comparison of PUR with GIA (71 km, UM 1, LM 2) 4/6/2019 SNARF May 04

Comparison of COD, SIO and PUR for 71 km, LM 1, UM 2 4/6/2019 SNARF May 04

Next steps Selection of sites to match to GIA Carefully check the logs of the selected sites (e.g, CHUR has an apparent discontinuity but date does not correspond with antenna change (there was one a few months before) Check local stability/non-GIA effects at sites. Correlated noise models let us assess “linear” motion sites but these can be affected by other processes Expansion of GIA model space (minima for fits are occurring at edges of model space). More complex models? 4/6/2019 SNARF May 04