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

Tanzania Volcano Observatory - OLO9-OLO9_OLO_TZA2021 P.S.
Start: 26-Jun-2021
End: 13-Nov-2022
Stamps, D. Sarah, Saria, Elifuraha, Hyeun Ji, Kang, Jones, J. Robert, Ntambila, Daud, Daniels, Mike, Mencin, Dave, 2021, Tanzania Volcano Observatory - OLO9-OLO9_OLO_TZA2021 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/EW7F-Z179