Summary of the studied emergencies and non-emergencies.

The columns provide the duration of the anomalous call activity (Fig. 1), the spatial decay rate (Fig. 2), the number of users in the event population , and the total size of the information cascade (Fig. 3). Events discussed in the main text are italicized, the rest are discussed in the supplementary material. ‘Jet scare’ refers to a sonic boom interpreted by the local population and initial media reports as an explosion.