The following information obtained from UNAVCO's online DOI system: (https://www.unavco.org/data/doi/search/search.html) SCIGN USGS GPS Network - DYHS-Downey H.S. P.S. Start: 15-Jul-1998 End: 23-Aug-2011 Hudnut, Kenneth, King, Nancy, Aspiotes, Aris G., Borsa, Adrian A., Determan, Daniel N., Galetzka, John E., Stark, Keith F., 2006, SCIGN USGS GPS Network - DYHS-Downey H.S. P.S., UNAVCO, GPS/GNSS Observations Dataset, https://doi.org/10.7283/T5JQ0Z9N