Fig. 4: Detected downtime events.
From: Social media usage reveals recovery of small businesses after natural hazard events
Downtime events longer than seven days detected in a Kathmandu, Nepal, b San Juan, Puerto Rico, c Juchitán de Zaragoza, Mexico. Transformed posting activity data, \({r}_{U}(t)\) (Eq. (4)), is shown in grey, its one week rolling mean is shown in black and the thresholds \({T}^{* }\) estimated with the elbow method are marked with dashed horizontal red lines. The detected periods of downtime are highlighted with vertical red bars (the natural hazard related event) and blue bars (other events). The date of the event in each region is marked by a dashed vertical magenta line.
