The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Central Iceland GPS Network - GJAC-Gjallandi Vonarsk P.S.
Start: 01-May-2015
End: 01-Oct-2018
Ofeigsson, Benedikt, Geirsson, Halldor, 2020, Central Iceland GPS Network - GJAC-Gjallandi Vonarsk P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/YP1J-9Z40