The following information obtained from UNAVCO's online DOI system: (https://www.unavco.org/data/doi/search/search.html) Galapagos GPS Network - GV09-GV09 - Sierra Negra P.S. Start: 31-Aug-2018 End: 02-Apr-2022 LaFemina, Peter, Amelung, Falk, 2009, Galapagos GPS Network - GV09-GV09 - Sierra Negra P.S., UNAVCO, GPS/GNSS Observations Dataset, https://doi.org/10.7283/5T3E-CY95 Galapagos GPS Network - GV09-GV09 - Sierra Negra P.S. Start: 19-Jan-2009 End: 02-Apr-2022 LaFemina, Peter, Amelung, Falk, Chadwick, Bill W., Geist, Dennis, 2009, Galapagos GPS Network - GV09-GV09 - Sierra Negra P.S., UNAVCO, GPS/GNSS Observations Dataset, https://doi.org/10.7283/XZAA-W505 Galapagos GPS Network - GV09-GV09 - Sierra Negra P.S. Start: 19-Jan-2009 End: 31-Aug-2018 Chadwick, Bill W., Geist, Dennis, 2009, Galapagos GPS Network - GV09-GV09 - Sierra Negra P.S., UNAVCO, GPS/GNSS Observations Dataset, https://doi.org/10.7283/T5VQ30WM