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

Galapagos GPS Network - GV11-GV11_SierraNegra P.S.
Start: 31-Aug-2018
End: 01-Apr-2022
LaFemina, Peter, Amelung, Falk, 2018, Galapagos GPS Network - GV11-GV11_SierraNegra P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/97QW-ZE19