Scatter plots comparing $T_i^{\mathrm{DGS}}$ and $T_i^{\mathrm{GNSS}}$ (left) and comparing $T_f^{\mathrm{DGS}}$ and $T_f^{\mathrm{GNSS}}$ (right) of detected EPB events (blue dots) by the co-located DGS and GNSS sensors in Guam for 2014. The grey dashed area indicates the events when GNSS observes EPBs start earling than DGS (left) and when GNSS finishes observing EPBs later than DGS (right). Red-dashed lines correspond to linear regressions: at left for the initial times, $T_i^{\mathrm{DGS}}=1.03T_i^{\mathrm{GNSS}}-0.75$ with a determination coefficient r² = 0.89, and at right for final times, $T_f^{\mathrm{DGS}}=1.02T_f^{\mathrm{GNSS}}+0.59$ with r² = 0.83.